Coccygeal plexus

Coccygeal Plexus

Diagram of the coccygeal plexus

The coccygeal plexus is a small network of nerve fibers located in the pelvic region. It is formed by the ventral rami of the fourth and fifth sacral nerves and the coccygeal nerve. This plexus is part of the sacral plexus and contributes to the innervation of the coccyx and surrounding structures.

Anatomy

The coccygeal plexus is situated anterior to the sacrum and posterior to the pelvic cavity. It is closely associated with the sacral plexus, which is a larger network of nerves that supplies the lower limb, pelvis, and perineum.

Formation

The coccygeal plexus is formed by:

• The ventral ramus of the fourth sacral nerve (S4)
• The ventral ramus of the fifth sacral nerve (S5)
• The coccygeal nerve (Co)

These nerves converge to form the coccygeal plexus, which then gives rise to the anococcygeal nerves.

Anococcygeal Nerves

The anococcygeal nerves are small branches that arise from the coccygeal plexus. They provide sensory innervation to the skin over the coccyx and the anococcygeal region. These nerves play a role in the sensation of the skin in the area around the anus and the coccyx.

Function

The primary function of the coccygeal plexus is to provide sensory innervation to the skin overlying the coccyx and the anococcygeal region. It does not have a significant motor function, as it primarily serves a sensory role.

Clinical Significance

The coccygeal plexus is not commonly associated with major clinical conditions, but it can be involved in certain types of coccydynia, or pain in the coccyx region. Understanding the anatomy of the coccygeal plexus can be important in diagnosing and treating pain in the lower back and pelvic region.

Related Pages

• Sacral plexus
• Coccyx
• Coccydynia
• Pelvic cavity