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Spinal Cord: Ventral Rami<br />
NEUROPHYSIOLOGY<br />
Base of skull<br />
C1 spinal nerve<br />
C8 spinal nerve<br />
T1 spinal nerve<br />
C1 vertebra (atlas)<br />
Cervical plexus<br />
Brachial plexus<br />
Intercostal<br />
nerves<br />
1st rib<br />
Spinal dura mater<br />
Filaments<br />
of spinal<br />
nerve roots<br />
(T7 and T8)<br />
T12 spinal<br />
nerve<br />
12th rib<br />
L1<br />
vertebra<br />
Conus medullaris<br />
L1 spinal nerve<br />
Cauda equina<br />
S1 spinal nerve<br />
Sacrum (cut away)<br />
Termination of<br />
dural sac<br />
Coccygeal nerve<br />
Lumbar plexus<br />
L5 vertebra<br />
Sacral plexus<br />
Sciatic nerve<br />
Coccyx<br />
©<br />
FIGURE 2.12<br />
SPINAL CORD AND VENTRAL RAMI IN SITU •<br />
The spinal cord gives rise to 31 pairs of spinal nerves that distribute<br />
segmentally to the body. These nerves are organized into plexuses<br />
that distribute to the neck (cervical plexus), upper limb (brachial<br />
plexus), and pelvis and lower limb (lumbosacral plexus). Motor<br />
fibers of these spinal nerves innervate skeletal muscle, and sensory<br />
fibers convey information back to the central nervous system from<br />
the skin, skeletal muscles, and joints.<br />
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