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Definition
Two consecutive rows of nerve roots emerge on each of spinal cords side sides. These nerve roots join distally to form 31 pairs of spinal nerves.
Each spinal nerve is composed of nerve fibers that are related to the region of the muscles and skin that develops from one body somite (segment). A spinal segment is defined by dorsal roots entering and ventral roots exiting the cord |
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Definition
| ylindrical structure, nervous tissue white and gray matter, uniformly organized and is divided into four regions: cervical thoracic lumbar and sacral, each of which is comprised of several segments. Two consecutive rows of nerve roots emerge on each of its sides. The cord is sheathed in the same three meninges as is the brain: the pia, arachnoid and dura. The dura is the tough outer sheath, the arachnoid lies beneath it, and the pia closely adheres to the surface of the cord |
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Term
| Cross section of the spinal cord shows |
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Definition
White matter (myelinated and unmyelinated nerve fibers)that transmits messages to and from the brain.
Gray matter (butterfly)functions as reflex center (cell bodies of motor neurons located here. |
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Definition
| Ends at the conus medullaris |
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Definition
Somatic efferent neurons
The axons of the spinal root neurons are the somatic efferent fibers |
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Term
| Syringomyelia syndrome occurs with selective spinal lesions in the |
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Definition
in the spinal white commissure
Syringomyelia syndrome results from lesions in the anterior spinal white commissure that results in losing pain and temperature sensation at the level of the lesion. |
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Term
| In the laminar somatopic organization of the dorsal columns, the most lateral fibers represent |
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Definition
| Cervical region The fibers entering at the lumbar region are located in the lateral portion of the dorsal columns |
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Term
| The blood supply for the corticospinal tract is derived from the: |
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Definition
| The anterior spinal artery supplies the corticospinal tract and the other tracts in this region. |
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Term
| Which of the following tracts crosses at the spinal cord level of entry |
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Definition
Ventral spinothalamic
From these tracts, only the lateral spinothalamic tract crosses at the entry level. |
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