Explain the nervous system characterized in echinoderms, Biology

Assignment Help:

How are the symmetry and the nervous system characterized in echinoderms?

Adult echinoderms, with cnidarians, are the animals that present radial symmetry, i.e., their body structures are dispersed around a center. The radial symmetry in echinoderms though is a secondary radial symmetry, as their larval stage has bilateral symmetry and the radial pattern appears only in adult individuals (there are some few adult echinoderms with lateral symmetry). All other animals have lateral symmetry with exception of poriferans (no symmetry is explained for them).

Echinoderms do not present cephalization and they have a disperse network of nerves and neurons made of a neural ring around the mouth and of radial nerves that ramify to follow the pentaradial structure of the body.

 


Related Discussions:- Explain the nervous system characterized in echinoderms

Define function of the iron uptake by cells, Define Function of the Iron Up...

Define Function of the Iron Uptake by Cells? Iron has several vital functions in the body. It serves as a carrier of oxygen to the tissues from the lungs by red blood cell haem

Carpentier-technique of operation, Carpentier: Edwards or similar annul...

Carpentier: Edwards or similar annuloplasty ring is then sutured into place by interrupted sutures to support the repair and reduce the annulus to a measured amount. The ring m

In which phase mother exchanges substances to fetus, Exchange of oxygen, nu...

Exchange of oxygen, nutrients, carbon dioxide and waste products from mother to fetus takes place through diffusion across the: a) Chorionic villi (pron: core-e-on-ick villi)

What are some examples of organs and tissues, What are some examples of org...

What are some examples of organs and tissues where mitosis is more frequent, less frequent or practically absent? Generally in vertebrates mitosis is more frequent in a tissue

Tissue distribution and regulation of calcium concentration, Define Tissue ...

Define Tissue Distribution and Regulation of Calcium Concentration? As already discussed, development and preservation of bone mass is quantitatively an important function of c

#title. Principles of Biology, Does greater light 80 cm instead of 20 cm p...

Does greater light 80 cm instead of 20 cm produce more photosynthesis on plants? Why or why not

Apical ectodermal ridge or aer, Apical Ectodermal Ridge (AER) We have ...

Apical Ectodermal Ridge (AER) We have described earlier that the AER persists at the tip until the last phalangeal cartilage begins differentiation. The following experiments

Spermatogonia - spermatozoa, Normal 0 false false false ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4 Spermatogonia - Spe

Temperature regulation in homeotherms, Temperature Regulation in Homeotherm...

Temperature Regulation in Homeotherms Homeothermy is regulation of body temperature by physiological means. The stabilisation of body temperature permits a steady high level

Which cardiac muscle is microscopically, State two ways in which cardiac mu...

State two ways in which cardiac muscle is microscopically similar to skeleton muscle.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd