The book A Text book of Zoology volume 1 was written by author T Jeffery Thomas Jeffery Parker Here you can read free online of A Text book of Zoology volume 1 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Text book of Zoology volume 1 a good or bad book?
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The nervous system usually consists of a single ganglion (Fig. 272, br. ) towards the dorsal aspect of the anterior part of the body, and representing the brain or supra-cesophageal ganglion of the higher Worms : it sends nerves to the muscles, trochal disc, and tactile organs. In some cases a smaller ventral or infra-cesophageal ganglion is present as well, connected with the first by a pair of slender ossophageal connectives. Connected with the dorsal ganglion are a pair of lateral longitudin...al nerves which run backwards to the tail, giving off branches in their course. One or more eyes (e. ) are usually present in close relation with the brain, and are sometimes mere spots of pigment, but may be provided with a refractive body or lens. The only other organs of sense are the tactile rods (d. F. , l. F. ), of which there is usually one on the dorsal surface near the anterior end of the body, and frequently two others, one on each side of the trunk. They are more or less rod-like structures, tipped with delicate sensory hairs and receiving nerves from the brain.
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