Motor activity of left side of body or right side of body
How is it structurally described that motor activity of left side of body is controlled by the right cerebral hemisphere and motor activity of right side of the body is controlled by left cerebral hemisphere?
Expert
In cerebral hemispheres there are neurons which centrally control and command muscle movements. These neurons are named as superior motor neurons and they are situated in a special gyrus of both frontal lobes which is known as motor gyrus (or precentral gyrus). The superior motor neurons send axons which transmit impulses to inferior motor neurons of spinal cord (for neck, limb and trunk movements) and to motor nuclei of cranial nerves (for face, mouth and eyes movements).
The fibers cross to other side in particular areas of those axon paths. About 2/3 of fibers which go down the spinal cord cross at medullar level forming a structure which is known as pyramidal decussation. The other (1/3) of fibers descends in same side of their original cerebral hemisphere and cross only in the spinal cord at level where their allocated motor spinal root exit. The fibers which command inferior motor neurons of cranial nerves cross to the other side just before the connection with nuclei of these nerves.
Motor fibers which descend from superior motor neurons to inferior motor neurons of spinal cord form the pyramidal tract. Injuries in this tract, for illustration, caused by the spinal sections or by central or spinal tumors might lead to the paraplegia and tetraplegia.
Name the type of tissue from which cartilages and bones are made up? Answer: Cartilages and Bones, tissues with great quantity of intercellular material, are made up
Are the limbs modified in the wings of bats and wings of bird’s examples of homology or evolutionary analogy? What about whale fins compared to the fish fins?
Organizational Design: This refers to the way that an organization aligns and structures its people and resources. Most of the organizations put a lot of effort into the design of their association based on the belief that the design has a big impact
Specify whether all mammals have placenta?
Are there any photosynthetic fungi? How fungi nourish themselves?
Explain phrase "price rationing" means.Price rationing is the procedure by which the market system allocates goods & services to consumers while quantity demanded exceeds quantity supplied.
What is an "entity-relationship" diagram helpful for, describe briefly?
What preventive measures must be taken for Cholera?
Illustrate out the wall resistance of plant cells? Does this resistance assist or make tricky the access of water in the cell?
Specify the parts into which Small intestine is divided?
18,76,764
1925358 Asked
3,689
Active Tutors
1424824
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!