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.
Why doesn't a long enduring vaccine against common cold subsist yet?
Define the term nucleolus?
Explain the procedure of reproduction in the beings of class Reptilia?
Briefly describe intra-specific and inter-specific ecological interactions?
Explain the physical process which accomplishes gas exchange in the pulmonary alveoli?
Facilities Consolidation: It is the manufacturing, distribution and facilities management functions of a corporation are frequently in the crosshairs of cost reduction efforts. It is due to important fixed and variable costs of production, distributio
Write down the life cycle of Plasmodium vivax?
Give a brief explanation of inductive or latent period?
What are some illustrations of control and informative function of the organic molecules?
What is the mechanism of precipitation?
18,76,764
1924328 Asked
3,689
Active Tutors
1419447
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!