Why does the size of the ventral horns of the spinal cord vary along its length why does the size of the ventral horns of the spinal cord vary along its length?
(D) The ventral horns contain both somatic motor and somatic sensory neurons. (C) The size of the ventral horns reflects the amount of skeletal musculature innervated at each level. Damage to the ventral root causes spastic paralysis, whereas damage to the descending tracts causes flaccid paralysis.
Why does the size of the ventral GREY Horn vary along the spinal cord?
The shape and size of the gray matter varies according to spinal cord level. At the lower levels, the ratio between gray matter and white matter is greater than in higher levels, mainly because lower levels contain less ascending and descending nerve fibers.
Why is ventral horn bigger?
Explaining the reason for this is fairly simple. The more muscles that a particular region of the spine serves, the greater number of neurons are needed and hence the bigger the size of the ventral horn.
Why is the ventral horn bigger in cervical and lumbar regions?
The reason behind the enlargement of the cervical region is because of the increased neural input and output to the upper limbs. An analogous region in the lower limbs occurs at the lumbar enlargement.
What is the difference between white and GREY matter in the spinal cord?
The grey matter contains the cell bodies, dendrites and the axon terminals, where all synapses are. The white matter is made up of axons, which connect different parts of grey matter to each other.
What is the gray commissure of the spinal cord?
a bundle of nerve fibers that surrounds the central canal of the spinal cord and connects the anterior and dorsal horns of gray matter in each half of the cord.
Which spinal nerves affect which parts of the body?
The nerves of the cervical spine go to the upper chest and arms. The nerves in your thoracic spine go to your chest and abdomen. The nerves of the lumbar spine then reach to your legs, bowel, and bladder. These nerves coordinate and control all the body’s organs and parts, and let you control your muscles.
What happens if the ventral horn is damaged?
Injury to the ventral horns can cause the lower motor signs in the arms and hands, and injury to the corticospinal tracts results in a spastic quadriparesis.
What is the function of ventral horn?
The ventral horns contains the cell bodies of motor neurons that send axons via the ventral roots of the spinal nerves to terminate on striated muscles.