Posterior Root of Second Sacral Nerve (Right)
Radix posterior nervi sacralis secundi
Read moreQuick Facts
Origin: In or just medial to the second sacral foramen.
Course: Medially from the sacral foramen and superiorly within the vertebral canal towards the posterior surface of the appropriate spinal cord level.
Branches: Unnamed rootlets just prior to entering the spinal cord.
Supply: Sensory innervation from the genitals, buttocks, posterior thigh, leg, and heel of the foot.
Origin
The posterior root of the second sacral nerve originates in, or just medial to, the second sacral foramen. It is at this point that the second sacral nerve splits into anterior and posterior roots.
Course
The posterior root of the first sacral nerve runs medially through the first sacral foramen into the vertebral canal. Here, it runs superiorly towards its corresponding spinal cord level in a large bundle of nerve roots called the cauda equina. The posterior root splits into smaller rootlets before entering the dorsal aspect of the spinal cord.
Branches
The posterior root of the second sacral nerve branches into several smaller rootlets shortly before entering the dorsal aspect of the spinal cord.
Supplied Structures
The posterior root of the second sacral nerve carries sensory innervation from the genitals, medial buttocks, posterior thigh, leg, and heel of the foot.
