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

Explain the working of skeletal muscle, Explain the working of Skeletal Mus...

Explain the working of Skeletal Muscle? Skeletal muscle is under voluntary control and is responsible for voluntary movements of body parts. Skeletal muscle is also called stri

What are the tupes of aortic aneurysm surgery, What are the tupes of Aortic...

What are the tupes of Aortic Aneurysm Surgery? Types of Surgery :  Technique of surgery and the approach depends on the site of thoracic or thoraco abdominal aortic aneuiysm.

Basics of echocardiography, Echocardiography is one of the -most frequent...

Echocardiography is one of the -most frequently used imaging modalities for diagnosing cardiovascular diseases. It i's versatile and is applicable in the entire spectrum of

Agro industrial-soaking, Soaking Soaking is an another inexpensive proc...

Soaking Soaking is an another inexpensive processing method, which does not require much technical know how, is commonly practiced for improving the palatability of chaffed cro

HOME, WHERE DOES LIZARD LIVE

WHERE DOES LIZARD LIVE

Aortic valve replacement-surgical techniques, Aortic Valve replacement ...

Aortic Valve replacement :  The initial steps of the operation have been described earlier. Ascending aorta is cannulated. A single two-stage atrio-venous cannula is inse

Define the phosphorus - the macromineral, Define the Phosphorus - The Macro...

Define the Phosphorus - The Macromineral? The body contains about 620 g (20 moles) of phosphorus. Of this 87% is present in bones. It is thus more widely distributed in the bod

Are environmental phenotypical changes transmitted offspring, Are environme...

Are environmental phenotypical changes transmitted to the offspring? Changes caused on the phenotypes by the environment are not transmitted to the offspring unless their prima

Define the integrity of gut or colon - dietary fiber, Define the Integrity ...

Define the Integrity of gut or colon? Dietary fibre especially fermentable fibres play an important role in maintaining the integrity of gut. SCFAs generated during fermentatio

Flowering - development of plant, Flowering - Development of plant One...

Flowering - Development of plant One of the major changes that occur during the life cycle of a plant is the transition from vegetative stage to the flowering stage. In this t

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