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The coccygeal plexus is a small nervous plexus upon the pelvic (anterior) surface of the coccygeus muscle. [1] This plexus is formed by the ventral rami of the fourth and fifth sacral nerves (S4-S5), and the ventral ramus of the coccygeal nerve (Co). The relative contributions of S4 and S5 are minor and major, respectively.
In human anatomy, the sacral plexus is a nerve plexus which provides motor and sensory nerves for the posterior thigh, most of the lower leg and foot, and part of the pelvis. It is part of the lumbosacral plexus and emerges from the lumbar vertebrae and sacral vertebrae (L4-S4). [ 1 ]
The nerves divide into branches and the branches from different nerves join with one another, some of them also joining with lumbar or coccygeal nerve branches. These anastomoses of nerves form the sacral plexus and the lumbosacral plexus. The branches of these plexus give rise to nerves that supply much of the hip, thigh, leg and foot. [4] [6]
Plan of sacral and coccygeal plexuses. Ventral rami of L4–S3 with parts of L4 and S4 spinal nerves form the sacral plexus. It is located on the posterior wall of pelvic cavity (pelvis minor). Nervi of the plexus innervate the perineal region, buttocks and the lower limb.
The trochlear nerve; The trigeminal nerve; The abducens nerve; The facial nerve; The vestibulocochlear nerve; The glossopharyngeal nerve; The vagus nerve; The accessory nerve; The hypoglossal nerve; The spinal nerves. The posterior divisions; The anterior divisions; The thoracic nerves; The lumbosacral plexus; The sacral and coccygeal nerves ...
Medial to this angle is a notch, which is converted into a foramen by the transverse process of the first piece of the coccyx, and this transmits the anterior division of the fifth sacral nerve. The thin lower half of the lateral surface gives attachment to the sacrotuberous and sacrospinous ligaments , to some fibers of the gluteus maximus at ...
The anterior divisions of the lumbar nerves, sacral nerves, and coccygeal nerve form the lumbosacral plexus, the first lumbar nerve being frequently joined by a branch from the twelfth thoracic. For descriptive purposes this plexus is usually divided into three parts: lumbar plexus; sacral plexus; pudendal plexus
The anococcygeal nerve is a sensory nerve of the pelvis [1] that arises from the coccygeal plexus. [2] It pierces the coccygeus muscle and the sacrotuberous ligament to supply a small area of skin between the coccyx and anus, [3] as well as the sacrococcygeal joint. [citation needed] The number of anococcygeal nerves varies between one and ...