Card 12 / 26: What is true regarding the cervical (circle) and lumbar enlargements of the spinal cord? (Scroll down to see all choices).
A.)
The extensive innervation required by neck structures, such as the larynx and pharynx, and by lower abdominal structures such as the bladder and reproductive organs cause an increase in gray and white matter.
B.)
The cord is larger because an increased number of axons and cell bodies is required in the cervical and lumbar regions to innervate the skin and muscles of the appendages.
C.)
There is an increase in white matter in the cervical region and an increase in gray matter in the lumbar region.
D.)
There is an increase in gray matter in the cervical region because of the increased motor innervation of the arms and an increase in white matter in the lumbar region because of the increased sensory innervation of the genitalia.
Answer:
B.) The cord is larger because an increased number of axons and cell bodies is required in the cervical and lumbar regions to innervate the skin and muscles of the appendages.
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Yes, L-3 - L-4 is commonly used for the lumbar tap procedure. A line connecting the two iliac crests helps locate this level. Note: in newborns, the conus is at the level of L-3, so a lower level or different procedure has to be used; in adults, however, L2 or below should be safe.
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Ch 04: Spinal Cord General Anatomy & Brain Stem
Author:
M.D.Stephen VoronLecturer
University of Utah
USA
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