Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. 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 control and command muscle movements. These neurons are called 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 trunk, neck and limb movements and to the motor nuclei of the cranial nerves for eyes, face and mouth movements).
The fibers cross to the other side in specific 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 descends in the same side of their original cerebral hemisphere and cross only inside the spinal cord at the level where their associated motor spinal root exit and the fibers that command the inferior motor neurons of the cranial nerves cross to the other side just before the connection with the nuclei of these nerves.
The motor fibers that descend from the superior motor neurons to the inferior motor neurons of the spinal cord form the pyramidal tract. Injuries in this tract, for instance, caused by spinal sections or by spinal or central tumors may lead to tetraplegia and paraplegia.
Basic Research Terms: Some of the basic terms that are defined in this section are: Assumptions Operational Definitions Variables Delimitation and Limitation H
Diestrus- Estrous cycle This lasts 60 to 70 hours during which functional regression of the corpora lutea occurs. The uteri are small, anaemic, and only slightly contractile.
Define Calcium, Phosphorus & Vitamin D required for Elderly? As mentioned earlier, due to the change in skeletal system, vitamin D and calcium needs increase with age. Bone min
To study the structure of a seed Soak seeds of bean, pea, pumpkin, sunflower, corn and other large forms. Take away the seed- coats and carefully cut the seeds open. Discover t
Q. What are the general functions of the connective tissues? The major functions of the connective tissues are: filling and supporting of spaces, cellular nutrition, energetic
This main protein component of connective tissue in mammals includes most of the organic matter of skin, bones, tendons, and teeth and occurs as fibrous inclusions in most other bo
Define cause of vitamin a deficiency - Infections? During acute infections, vitamin A intake in preschool children is reduced due to impaired appetite and impaired vitamin A ab
Q. What is the relation between the hypophysis and the thyroid? The hypophysis secretes TSH (thyroid- stimulating hormone). This hormone hastens the secretion of thyroid hormon
Right coronary artery arises from the anterior aortic sinus. It runs down along the anterior part of the coronary sulcus, reaches the lower border of heart turns round the lower bo
Two true-breeding pea plants were crossed. One parent is round, terminal, and violet, constricted, while the other expresses the respective contrasting phenotypes of wrinkled, axia
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!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd