Spinal Cord Anatomy CLOSE

Spinal Meninges

Drawing of a spinal cord segment enclosed by meninges: dura mater (blue), arachnoid (pink), and pia mater (purple). Bilaterally, the spinal cord segment gives rise to dorsal and ventral spinal roots (green) that unite to form a spinal nerve (yellow). The roots are composed of rootlets. A spinal ganglion is located distally on the dorsal root. Both the spinal cord (CNS) and the spinal roots (PNS) are enveloped by meninges, each root is in a separate meningeal sheath. Meninges are replace by connective tissue (epineurium, perineurium, endoneurium) at the level of the spinal nerve. Each spinal nerve gives rise to four primary branches.

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