Card 8 / 26: What cord segments comprise the conus medullaris, and what do they innervate?
A.)
The conus consists of lower sacral and a small coccygeal segment that innervates the perineum.
B.)
The conus consists of the lumbar and sacral segments which innervate the lower part of the body from the pelvis down.
C.)
The conus consists of S1-S5 and 3-4 coccygeal segments and innervates the pelvic area.
Answer:
A.) The conus consists of lower sacral and a small coccygeal segment that innervates the perineum.
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Spinal nerves C-1 - C-7 emerge above the corresponding vertebra. Since there is not an eighth cervical vertebra, spinal nerve C-8 emerges below vertebra C-7. All succeeding spinal nerves emerge below the vertebra for which they are named.
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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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