L1

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vertebra

Dural Sac Spinal Cord

12 th rib

Termination of dural sac

Coccygeal nerve

Figure 2.12 Spinal Cord and Ventral Rami In Situ

Conus medullaris L1 spinal nerve Cauda equina S1 spinal nerve Sacrum (cut away)

Termination of dural sac

Coccygeal nerve

Figure 2.12 Spinal Cord and Ventral Rami In Situ

The spinal cord gives rise to 31 pairs of spinal nerves that distribute fibers of these spinal nerves innervate skeletal muscle, and sensory segmentally to the body. These nerves are organized into plexuses that distribute to the neck (cervical plexus), upper limb (brachial plexus), and pelvis and lower limb (lumbosacral plexus). Motor fibers convey information back to the central nervous system from the skin, skeletal muscles, and joints.

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