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
What is the OBJECTIVES of evaluation of patient clinical examination ? After going through this unit, you should be able to: 1. Carried out the general physics-examination; 2.

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Q. Why can it be said that each glucose molecule runs the Krebs cycle twice? Each glucose molecule "cycles" the Krebs cycle twice because after glycolysis each used glucose has

Q. Can we make artificial cells? Research in progress at the "National Aeronautical and Space Administration (NASA)" is focused on artificial cells as a means to deliver medici

FORM S OF RIBOSOMES (1 )      Bound form - Attached to ER. Protein synthesis for secretion purpose occurs on bound ribosomes. (2 )      Free Ribosomes - Occur freely

Define Nutrient Requirements during Emergencies? The nutritional requirements of the people do change during conditions of unforeseen stress and/or any calamity. Certain recomm

As coenzymes participate in a variety of functions, they can be classified broadly into two groups: i)  Hydrogen transferring  coenzymes, and ii)  Group transferring coenzym

A dihybrid cross yields 320 F2 offspring. How many are expected to resemble the homozygous recessive parental?

Blunt Injury Closed penumothorax  Tension pneumothorax  Tracheobronchial injury  Fracture ribs and flail chest  Mediastinal injury

Stem - Plant Growth Substances The role of auxins, cytokinins, ethylene and abscisic acid in controlling the apical bud dominance and lateral bud dormancy (Apical Dominance) a