Dorsal Root Filaments

Spinal Cord: Membranes and Nerve Roots

Posterior view

Ventral root of spinal nerve Dorsal root of spinal nerve Spinal sensory (dorsal root) ganglion

Ventral ramus of spinal nerve Dorsal ramus of spinal nerve Dura mater

Arachnoid mater

Subarachnoid space Pia mater overlying spinal cord Filaments of dorsal root

Membranes removed: anterior view (greatly magnified)

Gray matter White matter

Ventral ramus of spinal nerve Dorsal ramus of spinal nerve Dura mater

Arachnoid mater

Subarachnoid space Pia mater overlying spinal cord Filaments of dorsal root

Spinal Nerve Pia

Membranes removed: anterior view (greatly magnified)

Gray matter White matter

Filaments of dorsal root

Ventral Dorsal Rami

Figure 2.13 Spinal Membranes and Nerve RootsP

Filaments of dorsal root

Dorsal root of spinal nerve

Filaments of ventral root

Spinal sensory (dorsal root) ganglion

Dorsal ramus of spinal nerve

Ventral ramus of spinal nerve

Ventral root of spinal nerve

Spinal nerve

Gray and white rami communicantes

Figure 2.13 Spinal Membranes and Nerve RootsP

The spinal cord gives rise to 31 pairs of spinal nerves that distribute segmentally to the body. Motor fibers of these spinal nerves innervate skeletal muscle, and sensory fibers convey information back to the central nervous system from the skin, skeletal muscles, and joints.

The spinal cord is ensheathed in three meningeal coverings: the outer, tough dura mater; the arachnoid mater; and the pia mater, which intimately ensheaths the cord itself. CSF bathes the cord and is found in the subarachnoid space.

Peripheral Nervous System

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