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
RESPIR A TIO N IN SCORPION OR SPIDER - Respiratory organs are book lungs. A book lung is a chamber containing a series of thin, vascular, parallel lamellae arranged li

We have no antibodies against any blood group when we are born still we say that some blood groups are incompatible for us.why?

Food-borne zoonoses Food-borne illnesses are serious public health problem. They are associated with the ingestion of contaminated foods by microorganisms and their toxins, ma

RESPIR A TIO N IN INSECT (COCKROACH) - Respiration is direct. So metabolic rate is high. This system is related to each cell of the body so respiratory pigment is ab

DNA can be divide into fragments using restriction enzymes.    (a) Outline the technique used to separate these fragments.    (b) What property of the DNA f

To study if bacteria grow better where it is warm or cold Again inoculate two sterile dishes. Label one 'warm'  and the other 'cold'. Place the 1st dish in a dark warm place an

Subphylum Opalinata Body covered with longitudinal rows of cilium like ,organelles but true ciliature absent. Parasitic; cytosome lacking; two to many nuclei of one type.

Define Food quality factors and their measurement? Appearance; textural, flavour, nutritional, sanitary and keeping factors; quality standards, objective and organoleptic evalu

Anomalies Related to Oral Cavity   Under these anomalies we will briefly discuss the cleft lip and cleft palate.  You must have seen and/or nursed a baby born with a cut on

The  nitrogenase  complex  is  extremely  sensitive  to  inactivation  by  O2,  so  the enzyme  must be protected  from this reactive  substance.  During the root nodules of legumi