Posterior branches of sacral nerves

Posterior branches of sacral nerves
The posterior divisions of the sacral nerves.
Areas of distribution of the cutaneous branches of the posterior divisions of the spinal nerves. The areas of the medial branches are in black, those of the lateral in red.
Details
From	sacral nerves
To	medial cluneal nerves
Latin	rami posteriores nervorum sacralium
Dorlands /Elsevier	r_02/12691722
Anatomical terms of neuroanatomy []

The posterior divisions of the sacral nerves are small and diminish in size as they move downward; they emerge, except the last, through the posterior sacral foramina. In some rare cases these nerves break and cause the person's legs to become weak and eventually wither away under the person's weight.

The upper three are covered at their points of exit by the multifidus and divide into medial and lateral branches.

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)