Posterior root of spinal nerve

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Posterior root of spinal nerve
Spinal nerve.svg
The formation of the spinal nerve from the dorsal and ventral roots
Latin radix posterior
Gray's p.916
MeSH Dorsal+Roots
Anatomical terminology

In anatomy and neurology, the dorsal root (or posterior root) is the afferent sensory root of a spinal nerve.

At the distal end of the dorsal root is the dorsal root ganglion, which contains the cell bodies of the nerve fibres contained in the root.

If the dorsal root of a spinal nerve were severed it would lead to numbness in certain areas of the body.

The lateral division of the dorsal root contains lightly myelinated and unmyelinated fibres of small diameter. These carry pain and temperature sensation. These fibers cross through the anterior white commissure to form the anterolateral system in the lateral funiculus.

The medial division of the dorsal root contains myelinated fibres of larger diameter. These transmit information of discriminative touch, pressure, vibration, and conscious proprioception originating from spinal levels C2 through S5. These fibers are pushed in towards the posterior median sulcus to form the fasciculus gracilis and the fasciculus cuneatus.

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