Skip to main content

Unfortunately we don't fully support your browser. If you have the option to, please upgrade to a newer version or use Mozilla Firefox, Microsoft Edge, Google Chrome, or Safari 14 or newer. If you are unable to, and need support, please send us your feedback.

Elsevier
Publish with us
Posterior Ramus of Fourth Sacral Nerve (Left)
Nervous System

Posterior Ramus of Fourth Sacral Nerve (Left)

Ramus posterior nervi sacralis quarti

Read more

Quick Facts

Origin: Fourth sacral nerve (S4).

Course: Emerges from the posterior sacral foramen, caudal to the multifidus muscle.

Branches: Forms neuronal loops on dorsum of the sacrum with the posterior rami of S5 and Co.

Supply: Sensory innervation to the skin over the coccyx.

Complete Anatomy
The world's most advanced 3D anatomy platform
Try it for Free

Origin

The posterior ramus of fourth sacral nerve originates as one of two terminal branches of the fourth sacral nerve, the other being the anterior ramus.

Course

The posterior ramus of fourth sacral nerve is smaller compared to the preceding upper sacral rami. It emerges from the posterior sacral foramen and lies caudal to the multifidus muscle.

Branches

The posterior ramus of fourth sacral nerve unites with the posterior rami of the fifth sacral and the coccygeal nerves to form neuronal loops posterior to the sacrum.

Supplied Structures & Function

Filaments from the loops provide sensory innervation to the skin over the coccyx.

Complete Anatomy

The world's most advanced 3D anatomy platform

Complete Anatomy