Nervous system of echinoderms, Biology

Nervous System of Echinoderms

Previous to studying the nervous system of echinoderms, you have to bear in mind the peculiar organization of these animals. Here as well, the nervous system is primitive, retaining the nature of the network pattern below the surface epithelium. The epithelium itself is strewn with sensory cells. Though, the network is, concentrated into ganglionated nerve cords. These retain the common radiate pattern of the group. You will see three systems here:

(i) The oral or the ectoneural system under the oral epidermis, made up of a ring around the oesophagus and a ganglionated strand extending from this ring along - each arm. Every cord is made up of tracts of fibers. This is the main system in most echinoderms.

(ii) The deeper Hyponeural system and

(iii) The aboral or apical system are much weak but organized on the same pattern as the, ectoneural system. So it is simple in structure and with close relationship with the epidermis, lacking ganglia or brain. Though, it has gone through certain amount of concentration, with circular and longitudinal cords. This marks the starting of a central nervous system.

Posted Date: 2/4/2013 6:37:23 AM | Location : United States







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

Write discussion on Nervous system of echinoderms
Your posts are moderated
Related Questions
How does the sodium-potassium pump present in the cell membrane work? What is the importance of this protein for the cell? The sodium-potassium pump is the transport protein th

The aqueous fluid that fills the nuclear region is known as karyolymph, or nucleoplasm. In the fluid there are proteins, enzymes and other significant substances for the nuclear me

what are the names of twelve cranial nerves

discuss about protozoa,metazoa,mesozoa and parazoa

Define Drug effects on food intake - Cause sore or painful Mouth? This is a common side effect of chemotherapy and can significantly affect food intake. Antineoplastic drugs, u

What does Balanced Diet means Balanced Diet means diet which contains a variety of foods in such quantities and proportions that the need for energy, proteins, vitamins, minera

What are immunoglobulins? Immunoglobulin is the exchange name given to antibody. Immunoglobulins are complex proteins having an invariable portion and a variable portion and ma

Ask question #Minimum 100 words accepted Which gas is essential for pjoto synthesis

Explain about the Gel bands detection techniques? Gel bands, resulting from a gel electrophoretic separation, may be detected by staining, radioactive counting or immunoblottin

notes on urea