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

State what is genetic engineering, State what is Genetic engineering Ge...

State what is Genetic engineering Genetically engineered plant-incorporated protectants are created by a process that utilizes  several dissimilar modern scientific techniques

What do you mean by high level of behavioral sophistication, Q What are the...

Q What are the few examples of beings of the phylum Arthropoda that present a high level of behavioral sophistication? Insects like some species of wasps, bees, termites and an

Explain trifluridine, Explain Trifluridine  (Viroptic)  Trifluridine is...

Explain Trifluridine  (Viroptic)  Trifluridine is a nucleoside analog active against herpes viruses, including acyclovir-resistant strains. Marketed in an ophthalmic preparatio

What is biodiversity, Q. What is biodiversity? The Biological diversity...

Q. What is biodiversity? The Biological diversity is the variety of species of living beings of an ecosystem. In the ecosystems which are more biodiverse, like tropical forests

Embryology, what is meaning of haustoria

what is meaning of haustoria

How does the vegetal stratification of an ecosystem, How does the vegetal s...

How does the vegetal stratification of an ecosystem influence the biological diversity? The vegetal stratification of an ecosystem, as the strata of the Amazon Rainforest, mak

Cutaneous respiration in earthworm., Cutaneous respiration in earthworm. ...

Cutaneous respiration in earthworm. The respiration performed by the skin is called cutaneous respiration  In earthworm skin is the only organ of respiration. The skin

Which are intracellular organelles present in bacteria, Q. Which are intrac...

Q. Which are intracellular organelles present in bacteria? Considering typical eukaryotic cell organelles heterotrophic bacteria have ribosomes essential for protein synthesis.

Marine biomes, The marine biomes consist of the earth's oceans and its asso...

The marine biomes consist of the earth's oceans and its associated areas like the shorelines, islands, reefs and estuaries. The marine waters contain about 3.5 percent salt, mostly

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