Nervous system of asteroidea, Biology

Nervous System of Asteroidea

The nervous system of steroids is not ganglionated and is closely related with epidermis. It consists mainly of a circumoral nerve ring surrounding the mouth. From this nerve ring radial nerves expand into each arm. The radial nerve supplies branches to the podia and ampullae and is continuous along with the subepidermal nerve net. Sense organs in asteroids are the eye spots found at the tip of the arm. The epidermis has as well sensory cells that probably function like photoreceptors, chemoreceptors and mechanoreceptors. The epidermal sensory cells are much more prevalent on the suckers of tube feet, tentacle like sensory the feet and along the margins of the ambulacral groove.

Posted Date: 2/4/2013 1:21:03 AM | Location : United States

Related Discussions:- Nervous system of asteroidea, Assignment Help, Ask Question on Nervous system of asteroidea, Get Answer, Expert's Help, Nervous system of asteroidea Discussions

Write discussion on Nervous system of asteroidea
Your posts are moderated
Related Questions
Define Absorption, Storage and Elimination of Riboflavin? Riboflavin is absorbed from the small intestine through the portal vein and is passed to all tissues via general circu

What are the five conditons that can cause evolution to take place?

Describe in detail about Retina The retina is a highly complex layer of nervous tissue. The photoreceptors are rods and cones for scotopic and photopic vision respectively. Th

Explain Diagnosis of Root Perforation 1- Exploration: Continuous bleeding if the defect touched during cleaning and shaping lead to difficult vision. Difficult to d

HIV-Infected patients Because TB therapy is complicated by co-infection with HIV, testing for HIV infection is recommended for all patients with active tuberculosis. To minimiz

Penicillin, discovered by the Scottish doctor Alexander Fleming, in 1928, is a drug that inhibits enzymes essential for the synthesis of peptidoglycans, a constituent of the bacter

Sporophytic Incompatibility The recognition and rejection reactions in a SSI system occur on the stigma surface, placing barriers for pollen germination or penetration of poll

The intermediates in the cycle give precursors for various biosynthetic pathways. An instance is as given below: -  From citrate synthesis of fatty acids; -  Amino acid synth

Ribavirin (Copegus, Rebetol, and others)  Combination treatment of HCV with peginterferon alfa and oral ribavirin has produced higher sustained response rates than peginterfero

Explain Poor growth - clinical signs of kwashiorkor? Growth retardation is the earliest manifestation of kwashiorkor, the child will be lighter and shorter than its normal peer