Explain about cerebral hemispheres, Biology

Assignment Help:

How is it structurally explained that the motor activity of the left side of the body is controlled by the right cerebral hemisphere and the motor activity of the right side of the body is controlled by the left cerebral hemisphere?

In the cerebral hemispheres there are neurons that centrally command and control muscle movements. These neurons are known as superior motor neurons and they are located in a special gyrus of both frontal lobes called as motor gyrus (or precentral gyrus). The superior motor neurons send axons that transmit impulses to the inferior motor neurons of the spinal cord (for neck, trunk and limb movements) and to the motor nuclei of the cranial nerves (for face, eyes and mouth movements).

The fibers cross to the other side in exact areas of those axon paths. About 2/3 of the fibers that go down the spinal cord cross at the medullar level forming a structure known as pyramidal decussation. The other (1/3) of fibers descend in the same side of their original cerebral hemisphere and cross only within the spinal cord at the level where their associated motor spinal root exit. The fibers that command the inferior motor neurons of the cranial nerves cross to the other side just before the link with the nuclei of these nerves.

 


Related Discussions:- Explain about cerebral hemispheres

What are pure culture techniques, What are Pure Culture Techniques? Mic...

What are Pure Culture Techniques? Microorganisms can be isolated from various natural environments like soil, food, water, sewage, decomposing matter and even from infectious m

Explain cephalization in nematodes and platyhelminthes, How is the nervous ...

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? Annel

Heparinisation-procedures of oxygenators, Heparinisation :  The patient sh...

Heparinisation :  The patient should be fully heparinised before the start of cardio pulmonary bypass. Baseline activated clotting time is measured (ACT). 3 mg (300 units) per k

Explain about the freeze drying Method, Explain about the freeze drying Met...

Explain about the freeze drying Method? The Techniques of freeze-drying have been developed over the past half-century for the purpose of preserving certain biological material

Mollusca, what is phylum mollusca?

what is phylum mollusca?

St depression at rest, Q. What is ST depression at rest? As early as 19...

Q. What is ST depression at rest? As early as 1965 Ostrand called attention to the syndrome of short PR interval without accelerated conduction and it's association with ST dep

Define decreased oxygen availability at high altitude, Define Decreased oxy...

Define Decreased oxygen availability at high altitude (Hypobaric hypoxia)? The governing biophysical factor at high altitude is decrease in barometric pressure with increase in

Reducing cost of accident, Reducing Cost of Accident One clear way to ...

Reducing Cost of Accident One clear way to control the cost of accident would be to follow all the rules of book for safety. All the methods of safety which were described ear

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