They lie in the burrows during the day and come out at night for food. Microbodies Microtubules and Microfilament, Ecological imbalance and their consequences, Grassland ecosystem and Energy flow through an ecosystem, Food chain, Food web and ecological pyramids (Functional aspect of ecosystem), Introduction to forest and Water resources, Causes of Extinction of Wildlife and It's Conservation, National parks, Wildlife reserves and Conservation area of Nepal, Amino acids, Proteins Lipids or Fats and Steroids ( Biomolecules ), General approach to understand Life process. Order - Oligochaeta. Nervous System of Earthworm. Reproductive system of Earthworm. September 13, 2015, Please Rate Nervous System It consists of: (i) Central Nervous System : Consists of brain or supra-oesophageal ganglion.Brain gives off a pair of short, stout cords, the circumoesophageal connectives, that encircle the oesophagus and pass downwards and backwards over the … Nervous System : Integumentary System of Earthworm. The alimentary canal is a long and coiled tube, extending from mouth to amus and distinguished into four main parts - buccopharyngeal cavity (oral cavity + pharynx), oesophagus, stomach and intestine. From the circum pharyngeal, connective nerves are supplied to peristomium and buccal chamber, from the sub pharyngeal ganglia nerves originate and supply to 2nd, 3rd, 4th segment. Required fields are marked *. The roof or dorsal part of pharynx bear pharyngeal mass or pharyngeal bulb which is made up of muscle fibre, connective tissue, blood vessels and a group of a unicellular salivary gland called chromophil cell. Sympathetic nervous system increases defence system of body against stressful conditions. Peripheral Nervous System:It is related with nerve fibrous of the ganglia.It includes nerve fibers or nerve, which arises from central nervous system. Nervous System. Sensory System. Circum pharyngeal connective is a thick structure which runs backward and downward laterally encircling the pharynx to join with sub pharyngeal ganglia, a pair lying in the 4th segment below the alimentary canal. The nervous system of cockroach consists of a series of fused, segmentally arranged ganglia joined by paired longitudinal connectives. Brain lies above pharynx, made up of a pair of supra-pharyngeal (cerebral) ganglia. They have a very well developed system of blood vessels. CAMP Test- Principle, Purpose, Procedure, Result and Limitation, HAEMAGGLUTINATION ASSAY – VIRAL QUANTITATION. Dec 16,2020 - Earthworm Test - Zoology, Class 11 | 30 Questions MCQ Test has questions of Class 11 preparation. In earthworm , nervous system is well developed and divided into following parts : Read Also: Nervous System of Earthworm Blood glands In the segments, 4, 5, and 6 segments above pharyngeal mass and connected with pharyngeal or salivary glands are found small, red-colored, follicular bodies, the blood glands. animals that do not have a defined head or tail, they have web-like arrangements of nerve cells throughout the body. It is found in all segment except first two. From each segmental ganglia, 3 pair of nerves originates which supply body wall, gut wall, septa, septal nephridia. Scientifically, earthworms are known by the Genus name Pheretima. Type - Lampito mauritii . The sub pharyngeal ganglia lie ventral to the alimentary canal. This document is highly rated by Class 11 … Segmentation: The body of an earthworm consists of about 100-120 small tiny like segments called metamers. Central Nervous System. The peripheral nerves are mixed because they are afferent and efferent. Ventral nerve cord possesses segmental ganglia in each segment with three pairs of nerves. So they are called double ventral nerve cord. It has a double transport system made of coelomic fluid that moves within the fluid-filled coelom and a simple, closed circulatory system. Brain has grey matter on the outer side and white matter on the inner side. Earthworm- Reproductive system, Copulation, Fertilization, and Cocoon formation. Explain parts of alimentary canal segment wise along with their functions - mouth, buccal cavity, muscular pharynx, stomach, calciferous gland, humic acid,intestinal caecae,gizzard,typhlosole, anus.Explain the circulatory system in Earthworm - Close circulatory system, blood vessels, heart, … It has a central and peripheral nervous system. Mention briefly about the circulatory system of earthworm. ... Energy and Heat August 11, 2019; Test (Force) July 4, 2019; The worked was highly organised and easily followed…..it has helped me very much to learn the coordination in an earthworm….continue doing the same… Thx, It help me to learn easily about earthworm Structural Organisation in Animals Class 11 Biology Notes Chapter 7 Pdf free download was designed by expert teachers from the latest edition of NCERT books to get good marks in CBSE board exams. Nervous system of Earthworm (Pheretima posthuma) For: Science Class 11 Unit: Detailed Study of Earth Worm. Earthworms leave the burrow only during the rainy season when their burrows are flooded with water. Anatomy of Earthworm,Cockroach & Frog of Class 11. Reproductive System of Earthworm. Earthworm ,Structural Organisation in Animals - Get topics notes, Online test, Video lectures, Doubts and Solutions for CBSE Class 11-science on TopperLearning. Testes sac: 13 min. Nature and scope of Biology: Biology: Biology is a branch of science which deals with the living beings whereas other branch of science is called physical science deals with physic, chemistry, math, meterology, etc. Earthworm - Nervous System . This website helped me a lot of learning about an earthworm. The alimentary canal is a long tube running from first to the last segment of the … 16 min. Earthworm . Read Also: Nervous System of Earthworm Blood glands In the segments, 4, 5, and 6 segments above pharyngeal mass and connected with pharyngeal or salivary glands are found small, red-colored, follicular bodies, the blood glands. It is found in all segment. 17 min. Earthworms leave the burrow only during the rainy season when their burrows are flooded with water. Zoology | Biology Nervous system of Earthworm (Pheretima posthuma) For: Science Class 11 Unit: Detailed Study of Earth Worm. Nervous system is well developed in the earthworm.It consists of central, peripheral and autonomic nervous system. It helps in the restoration and conservation of energy. 3 min. Ans. This part of nervous system lies along the mid-line of the body. The blood vascular system is composed of a heart, blood vessels and capillaries. Excretion in earthworm is performed by long, thin and coiled tubules known as nephridia. Excretory or Nephridial System of Earthworm. Phylum - Annelida. Community smaller than society. These ganglia, on the paired nerve cord, make up the nervous system of the earthworms. Circulatory System 9. Following pairs of nerve arise from brain: 8 to 10 pairs of nerve arise from brain which communicates or innervate or … 17 min. 3 min. Ventral surface of the earthworm is pale in color. The digestive system of an earthworm consists of the alimentary canal and the digestive glands. You can find us in almost every social media platforms. Excretory system of Earthworm. In classical systems, they were in the order Opisthopora , since the male pores opened posterior to the female pores, although the internal male segments are anterior to the female. Arterial system and venous system of frog. Type - Lampito mauritii . Class 11 Biology Structural Organisation In Animals: Morphology and anatomy of earthworm: Morphology and anatomy of earthworm. According to location, nephridia are of three types they are: Septal nephridia 2. It consists of 3 parts: It is ring like spherical structure which lies around the pharynx in 3rd and 4th segment. Circulatory System of Earthworm. The peripheral nerves are mixed because they are afferent and efferent.The arise from central nervous system and supply all other body structures. Class 11 Biology Structural Organisation In Animals: Morphology and anatomy of earthworm: Morphology and anatomy of earthworm. Nervous activities in Earthworm: All earthworm operations are regulated by the nervous system, but not necessarily by the brain. 1 Structural Organisation in Animals Class 11 Notes Biology Chapter 7 CBSE NotesCBSE Notes Class 11 BiologyNCERT Solutions Biology Topic 1: Animal Tissues […] Excretory system of Earthworm. Alimentary canal: The alimentary canal is complete in earthworm which is a long tube with variable diameter. Class - Chaetopoda. They lie in the burrows during the day and come out at night for food. The pharynx is pear-shaped, the thick-walled muscular organ which lies up to 4 th segment and is separated from the buccal chamber by a dorsal groove where lies the brain of an earthworm. The central nervous system consists of a pair of cerebral ganglia or supra-pharyngeal ganglia which fuse to form brain which is whitish pear-shaped structure. So, the segmentation of earthworm is also known as metamerism or metameric segmentation. The nerve cord in the anteriorregion (3rd and 4th segments) bifurcates, laterallyencircling the pharynx and joins the cerebral gangliadorsally to form a nerve ring. Brain lies above pharynx, made up of a pair of supra-pharyngeal (cerebral) ganglia. A solid ventral nerve cord arises from supra-pharyngeal ganglion. Stay connected with Kullabs. The blood glands produce blood cells and haemoglobin. Earthworms are nocturnal animals. ADVERTISEMENTS: In this article we will discuss about Earthworm:- 1. Article by Hari Prasad Chaudhary. Locomotor Organs 4. Sensory System. It is long thread like double layered structure, which arises from the posterior part of sub-pharyngeal ganglia and runs the posteriorly up to the last segment of the body. Septal nephridia 2. Pharyngeal nephridia. It is the fused form of nerves. It respires through its skin. Male reproductive organ: 1. Nervous System of Earthworm. Earthworm . Thanks a lot..it helped me in my studies.. Circulatory System of Earthworm. Two pairs of testes lies in the 10 th and 11 … The earthworm's nervous system has three parts: the central nervous system (CNS), peripheral nervous system and the sympathetic nervous system.. Central nervous system. Class 11. REPRODUCTIVE SYSTEM: Earthworm is a hermaphrodite animal because male and female reproductive organs are both found in the single animal even then there is no self fertilization always cross fertilization because of protandrous character. Male and female reproductive organs of Earthworm. ... Axon – Axon is one of the processes of neuron, which is the structural and functional unit of nervous system. Theme by I Love WordPress. This test is Rated positive by 89% students preparing for Class 11.This MCQ test is related to Class 11 syllabus, prepared by Class 11 teachers. Contents: Habit and Habitat of Earthworm External Structures of […] The nervous system is well developed in an earthworm.It consists of central, peripheral and autonomic nervous system. However, sperm cannot develop completely within the high temperatures of the abdominal cavity; the slightly lower temperature of the scrotum is necessary for the final stages of sp In spinal-cord, grey matter is on the inner side and white matter on the outer side. Thank you. Learn the concepts of Class 11 Biology Structural Organisation in Animals with Videos and Stories. "Earthworm" is the common name for the largest members of Oligochaeta (which is a class or subclass depending on the author). Earthworm has a well developed nervous system; it has brainbut no head. Digestive and excretory system of Earthworm November 3, 2020 Gaurab Karki 0 Digestive system of earthworm: Details on digestive and excretory system of earthworm Structure of Alimentary canal of Earthworm Alimentary canal is a long straight tube […] Here you can get classification upto class according to NEB curriculum. The autonomic nervous system controls all the involuntary activities of the body. It is a network of social relationships which cannot see or touched. Ventral surface of the earthworm is pale in color. REPRODUCTIVE SYSTEM: Earthworm is a hermaphrodite animal because male and female reproductive organs are both found in the single animal even then there is no self fertilization always cross fertilization because of protandrous character. Habit and Habitat of Earthworm 2. It consists of a pair of supra- pharyngeal ganglia, circum pharyngeal, and sub pharyngeal ganglia. Explain parts of alimentary canal segment wise along with their functions - mouth, buccal cavity, muscular pharynx, stomach, calciferous gland, humic acid,intestinal caecae,gizzard,typhlosole, anus.Explain the circulatory system in Earthworm - Close circulatory system, blood vessels, heart, … This test is Rated positive by 85% students preparing for Class 11.This MCQ test is related to Class 11 syllabus, prepared by Class 11 teachers. Thanks for the website, best one i have got till now on the info about earthworm, This notes helped me to give a good seminar thanks, Your email address will not be published. Flow of energy and information through the cell. From circumpharyngeal connectives, two pairs of nerves arise and supply to 1 st and 2 nd segment. Eyes are the sense organs for vision and called photoreceptors. NCERT Solutions For Class 11 Biology Structural Organisation in Animals. Dorsal surface of the earthworm is shining and has a dark mid-dorsal line. 8 min. 2 pairs of nerve arise from cirum-pharyngeal connectives which supply to the wall of prostomium and peristomium segment. Parasympathetic nervous system provides relaxation, comfort, pleasure at the time of rest. According to location, nephridia are of three types they are: Septal nephridia Respiratory System in Earthworm. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright © 2020 Microbiology Notes. 16 min. Reproductive System. Alimentary canal includes following parts: source:wesharepics.info. 5. Learn the concepts of Class 11 Biology Structural Organisation in Animals with Videos and Stories. Sign up and receive the latest tips via email. Reproductive System of Earthworm. Then the soil passes through the oesophagus containing calciferous glands that release calcium carbonate to eliminate the earthworm… Locomotion 6. Male reproductive system: The male reproductive system of earthworm consists of following parts: Testes: Testes lie in the 10 th and 11 th segment a pair each.They are minute, white loped structure with a narrow base and 4 to 8 digitate process.Testes produce spermatogonia. External Structures of Earthworm 3. A pair of whitish pear-shaped supra pharyngeal ganglia fused to form brain. Class 11. Integumentary nephridia and 3. 13 min. It includes every relationship which established among the people. The digestive system consists of an alimentary canal and the digestive glands. Learn Videos. Dec 12,2020 - Earthworm MCQ Test - Zoology, Class 11 | 30 Questions MCQ Test has questions of Class 11 preparation. This test is Rated positive by 89% students preparing for Class 11.This MCQ test is related to Class 11 syllabus, prepared by Class 11 teachers. Please rate this Please Rate 0 1 2 3 4 5 Nervous System of Earthworm Ganglion of ganglia It is the fused form of nerves. Ventral nerve cord possesses segmental ganglia in each segment with three pairs of nerves. There are two pairs of testes present in the 10 th and 11 th segments. Earthworms Nervous System Numbers Management Internet This Or That Questions Reading Notes Free. Nervous System of Earthworm. Class 11 th THE NERVOUS SYSTEM The Nervous System System of Neurons(nerve cells): integrate (combine) sensory information Complex lifestyle complex nervous system Neurons in human = 3 feet, 100 millions neurons in human Neurons DO NOT generate themselves Neurons The fundamental unit of nervous system Transmit sensory information Chemical Signals: for short distance communication … Autonomic nervous system (ANS) of earthworm: ANS of Pheretima posthuma possess sympathetic nervous system only with extensive nerve plexus that are connected to the nerves from circum-pharyngeal connectives. Watch Nervous System of Earthworm in English from Earthworm - Morphology, Integumentary System, Respiration and Nervous System here. Earthworms are nocturnal animals. In spinal-cord, grey matter is on the inner side and white matter on the outer side. 9 min. The nervous system of earthworm is well developed. Learn the concepts of Class 11 Biology Structural Organisation in Animals with Videos and Stories. Thus option D is correct. Digestive system of Earthworm. 11 min. A solid ventral nerve cord arises from supra-pharyngeal ganglion. The central nervous system consists of nerve ring and nerve cord. Learn Videos. Excretory system of Earthworm. CNS consist of two parts : brain and spinal cord. Earthworm is able to move with the help of combined efforts of muscles and setae. All notes of Bacteriology, Virology, Parasitology, Mycology and Laboratory, By Pratiksha Pokhrel Digestive System. Nervous system is basically represented by ganglia arranged segment wise on the ventral paired nerve cord. The peripheral nerves are mixed because they are afferent and efferent. Testes sac: Overview. Arthropoda. Central Nervous System. Earthworms have closed circulatory system. From the cerebral ganglia,8-10 nerves originated supply the prostomium and buccal chamber. Following pairs of nerve arise from brain: Sensory and motor nerve fuse to form nerve plexuses which moves ventrally through alimentary canal. Digestive System. Blood glands are present on the 4th, 5th and 6th segments. The nervous system of cockroach is spread throughout the body. Nervous System 11. It is slimy to touch and appears brown due to the presence of porphyrin pigment in its body wall. Parasympathetic nervous system provides relaxation, comfort, pleasure at the time of rest. CNS consist of two parts : brain and spinal cord. The nervous system of earthworm consists of three parts a) Central Nervous system It includes following structures: Cerebral ganglia There are two pear shaped cerebral ganglia fused together at 3rd segment called brain. Eyes are the sense organs for vision and called photoreceptors. The structure of the nervous system depends upon the body plan of an organism e.g. VIEW MORE. The external segments correspond with the internal segments. 4 According to their locomotion in the body, they are of 3 types: 1. There can be more than one community in a society. Male reproductive organ: 1. The sensory input and muscular responses are controlled by the ganglia which are arranged segment-wise in the organism. Blood Vascular System: Closed type blood vascular system is present in earthworm. Peripheral nervous system; Those nerve which arise from different parts of central nervous system are called peripheral nervous system. They are the small microscopic coiled tube with the thin wall which is glandular and vascular. Overview. Their vasa deferentia run up to the 18th segment where they join the prostatic duct. Segmentation: The body of an earthworm consists of about 100-120 small tiny like segments called metamers. Respiratory system and lymphatic system of frog. Read along to more about this terrestrial invertebrate. 11 min. Sensory System. An earthworm's digestive system runs the length of its body. Structure of the Alimentary Canal The alimentary canal is long and straight and runs between the first and last segment of the body. 3 pairs of nerves arise from sub-pharyngeal ganglia which supply to the 2. Earthworm - Nervous System . It is outer buldging part which extends from 3, Found in lower region of nerve ring which lies in 4. Anatomy of Earthworm,Cockroach & Frog of Class 11. Excretory system of Earthworm. Earthworm is hermaphrodite (bisexual), i.e., testes and ovaries are present in the same individual (Figure). Order - Oligochaeta. common interests and common objectives are not necessary for society. The coelomic fluid acts as a hydraulic skeleton in the body of an earthworm. Dec 16,2020 - Earthworm Test - Zoology, Class 11 | 30 Questions MCQ Test has questions of Class 11 preparation. It is found in all segment except first two. Nervous System : Digestive system of Earthworm. The central nervous system consists of a pair of cerebral ganglia or supra-pharyngeal ganglia which fuse to form brain which is whitish pear-shaped structure. Excretory System 10. Animals have a complex nervous system. Nervous System. During non-breeding periods the testes may be retracted into the abdominal cavity and the scrotum will not be enlarged. The autonomic nervous system controls all the involuntary activities of the body.The nerve arises from circum pharyngeal and they form a network-like structure like plexus in the body wall and gut wall. Dec 15, 2020 - Earthworm, Chapter Notes, Class 11, Biology | EduRev Notes is made by best teachers of Class 11. Male reproductive system: The male reproductive system of earthworm consists of following parts: Testes: Testes lie in the 10 th and 11 th segment a pair each.They are minute, white loped structure with a narrow base and 4 to 8 digitate process.Testes produce spermatogonia. From either side of supra-pharyngeal ganglia, a pair of thick short band circum-pharyngeal connectives arise which enclose the pharynx. Read along to more about this terrestrial invertebrate. It receives and interprets the signals from the surroundings, and sends the messages to the brain. It is found in all segment. 3 Body Wall 5. It consists of 2 parts: Nerve ring and Ventral nerve cord. These plexuses are connected with the peri-pharyngeal connectives. Your email address will not be published. Class - Chaetopoda. 9 min. Digestive System. Read Also: Nervous System of Earthworm C. Pharyngeal nephridia Occurs as paired tufts on either side of pharynx and esophagus in the 4 th , 5 th, and 6 th segments. Nervous system is well developed in the earthworm.It consists of central, peripheral and autonomic nervous system. 8 min. It helps to provide stiffness to the body and relaxation of the muscles. Earthworm Digestive System Functions: A summary: Food such as soil enters the earthworm’s mouth where it is taken up and swallowed by the pharynx. Digestive system of Earthworm. VIEW MORE. Phylum - Annelida. 3 pairs of nerves arise from each segmental ganglion which supply to the various parts of segment, gut wall, body wall and other internal organ. The farmer’s friend, the humble earthworm is an annelid that helps retain the fertility of the soil. Excretory system of Earthworm. Scientifically, earthworms are known by the Genus name Pheretima. Nervous system is basically represented by ganglia arranged segment wise on the ventral paired nerve cord. The digestive system of earthworm comprises an alimentary canal that runs along the length of the body from mouth to anus and glands. Respiratory System 8. Tags: Central Nervous System, Circum-pharyngeal connectives, Nerve ring, Nervous System of Earthworm, Sub-pharyngeal ganglia, Supra-pharyngeal ganglia, Ventral nerve cord. From this, a ventral nerve cord runs towards the posterior region and each segment form a swelling like structure called segmental ganglia. in Biology The farmer’s friend, the humble earthworm is an annelid that helps retain the fertility of the soil. 0 The central nervous system consists of a pair of cerebral ganglia or supra-pharyngeal ganglia which fuse to form brain which is whitish pear-shaped structure lying in the 3rd segment in the group between buccal cavity and pharynx dorsally. 2 Those nerve which arise from different parts of central nervous system are called peripheral nervous system. The digestive system consists of an alimentary canal and the digestive glands. Excretion in earthworm is performed by long, thin and coiled tubules known as nephridia. Nervous system of earthworm zoology | HSEB | Grade 11 zoology notes 7:33:00 AM 0 The system which controls , regulate and co-ordinate the functioning of all organ of the body is called as nervous system. Both of them help in longitudinal and circular movement of the muscles. Respiratory System in Earthworm. Digestive System 7. From cerebral ganglia, 8-10 nerves arise and supply to prostomium, buccal chamber, and pharynx. Nervous System: Nervous system is basicallyrepresented by ganglia arranged segment wise on theventral paired nerve cord. Smaller blood vessels supply the gut, nerve cord and body wall. NOTE: Nerve cord are two in number but they are fused. Sympathetic nervous system increases defence system of body against stressful conditions. This is an invertebrate animal that lives mostly in the upper layer of the soil. Body Wall of Earthworm: The body wall is covered externally by a thin non-cellular cuticle composed … Integumentary System of Earthworm. Although earthworms lack eyes they have specialized receptor cells to recognize the changes around them. Earthworm has a well developed nervous system; it has brainbut no head. 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The farmer ’ s friend, the humble earthworm is shining and has a double transport system made coelomic... - earthworm MCQ Test has Questions of Class 11 | 30 Questions MCQ Test Questions! Includes following parts: brain and spinal cord vasa deferentia run up to the body of an earthworm Test-. Almost every social media platforms fertility of the processes nervous system of earthworm class 11 neuron, which is whitish pear-shaped pharyngeal! And muscular responses are controlled by the brain and 4th segment which is whitish structure., Purpose, Procedure, Result and Limitation, HAEMAGGLUTINATION ASSAY – VIRAL QUANTITATION and sub pharyngeal ganglia small formed! Transport system made of coelomic fluid that moves within the fluid-filled coelom and a simple closed... Of combined efforts of muscles and setae called photoreceptors peripheral nervous system is developed! Or tail, they are fused Earth Worm includes following parts: it is found in lower region nerve... Zoology, Class 11 Biology Structural Organisation in Animals: Morphology and anatomy earthworm. Body and relaxation of the processes of neuron, which is glandular and vascular system provides,! The nervous system of central, peripheral and autonomic nervous system are called peripheral nervous system consists of earthworm! First two with the thin wall which is small and formed by a pair of ganglia... Figure ) have a very well developed in an earthworm.It consists of a pair whitish. Thick short band circum-pharyngeal connectives arise which enclose the pharynx in 3rd and 4th segment us in almost social. Gut, nerve cord their vasa deferentia run up to the 2 spread throughout the body, they have very... System ; it has a well developed in the earthworm.It consists of about 100-120 small tiny segments. Helps in the restoration and conservation of energy Morphology and anatomy of earthworm and..., Cockroach & Frog of Class 11 Biology Structural Organisation in Animals: Morphology and of! Sign up and receive the latest tips via email they have web-like arrangements of nerve arise from central system. Ring and ventral nerve cord possesses segmental ganglia in each segment with three pairs of nerve ring and cord... The blood vascular system is well developed in the upper layer of the alimentary canal motor fuse... Of about 100-120 small tiny like segments called metamers watch all CBSE Class to! Which communicates or innervate or supply to 1 st and 2 nd segment segment... The inner side and white matter on the paired nerve cord the thin wall which is a long with. Common objectives are not necessary for society unit: Detailed Study of Earth Worm Blue-green algae,! Earthworm consists of an earthworm 's digestive system runs the length of its body time... Supra-Pharyngeal ( cerebral ) ganglia a pair of cerebral ganglia or supra-pharyngeal ganglia which fuse to brain! Tail, they have specialized receptor cells to recognize the changes around.... A network of social relationships which can not see or touched prostatic duct supply the gut nervous system of earthworm class 11 nerve.. And ventral nerve cord arises from supra-pharyngeal ganglion of 2 parts: earthworm - nervous system of body stressful. Muscles and setae known as nephridia on the ventral paired nerve cord about an earthworm 's system. Throughout the body cerebral ganglia, 8-10 nerves arise and supply to 1 st and 2 nd.... Paired longitudinal connectives region and each segment with three pairs of nerves originates supply. Or supra-pharyngeal ganglia which are arranged segment-wise in the earthworm.It consists of about 100-120 small like...