Explain cephalization in nematodes and platyhelminthes, Biology

Assignment Help:

How is the nervous system characterized in beings of the phylum Annelida? How can one compare cephalization in annelids to cephalization in nematodes and platyhelminthes?

Annelids have a nervous system made of two ventral chords and one relatively big nervous cell concentration in its anterior portion resembling a primitive brain.

Nematodes have an anterior neural ring connected to two neural chords, a ventral and a dorsal one, while in planarias (platyhelminthes) there are only two small anterior "cerebral" ganglia from which neural chords split. Cephalization in annelids thus is more outstanding than in nematodes or in flatworms.

 


Related Discussions:- Explain cephalization in nematodes and platyhelminthes

Succession, Similarities between autotrophic succession and heterotrophic s...

Similarities between autotrophic succession and heterotrophic succession

Examine the cysticerus larva under the microscope, Examine the cysticerus l...

Examine the cysticerus larva under the microscope? Examine the cysticerus larva under the microscope and note the following: i)  Bladder worm consists of a single layered, l

Explain adverse effects of amantadine, Adverse Effects of amantadine  ...

Adverse Effects of amantadine  Amantadine may cause anorexia, nausea, peripheral edema and, particularly in the elderly, minor CNS effects such as nervousness, anxiety, insomn

Define the medical complications of bulimia nervosa, Define the Medical Com...

Define the Medical Complications of Bulimia Nervosa? The medical complications of bulimia nervosa range from fairly benign, transient symptoms, such as fatigue, bloating and co

Light and dark reactions, Evidence for Existence of Light and Dark Reaction...

Evidence for Existence of Light and Dark Reactions The process of photosynthesis was known in its bare outline already at the beginning of this century. But the phenomenon wa

How you can repair ventricular aneurysm with a patch?, How you can Repair V...

How you can Repair Ventricular Aneurysm with a patch? Repair of Ventricular Aneurysm with a patch :  Originally described by Cooley, as endoaneurysmorra

Illustrate in detail about the cell theory, Illustrate in detail about the ...

Illustrate in detail about the Cell theory All living organisms are composed of cells, and they are the basic structural and functional units of life, just like the atom is a

Explain about types of insulin, Q. Explain about types of Insulin? Thre...

Q. Explain about types of Insulin? Three types of Insulin is available. The type varies in how quickly it starts working (lowering blood glucose), time of peak activity (when t

Steps to follow in diagnosis of dysentry, Assessment   The child with dy...

Assessment   The child with dysentery will present you with sudden onset of fever, prostration, vomiting, bloody diarrhoea, abdominal pain and tenesmus. Patient may suffer from

Some common air pollutants: oxides of nitrogen, Oxides of nitrogen:   ...

Oxides of nitrogen:          These include nitrogen monoxide (NO) and nitrogen dioxide (NO2). NO is a colourless, odourless and inert gas but like CO it can also combine with

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