Sacral plexus

The lumbosacral plexus ( Loins and braid ) is a network of Ventraläste ( ventral directed nerve branches, ventral rami ) of spinal nerves of the lumbar and sacral segment ( Th12 to max. S5, depending on the number of sacral vertebrae ) of the spinal cord. For this braid go through exchange of nerve fibers of various spinal cord segments produces new nerve which now contain portions of several segments and innervate the lower extremities, the abdominal wall and pelvis. While only small at the lumbar nerve plexus of the character, the cross- links between the sacral nerves are very pronounced.

Nerves of the lumbosacral plexus

The splitting of the nerve is remarkably uniform in mammals, so that a common representation of humans and animals can be made. The lumbosacral plexus is sometimes further divided into a lumbar plexus, sacral, and coccygeal pudendal nerve, although this division is anatomically not very useful.

Lumbar plexus

Origin of human Th12 -L4, about Rami communicantes in conjunction with lumbar part of the sympathetic trunk, short rami musculares for the supply of psoas major, psoas minor muscle and the quadratus lumborum. In particular, a distinction in the lumbar plexus nerves following:

Sacral plexus

The sacral plexus consists of the ventral rami of the 1st to the 3rd sacral nerves and the lumbosacral trunk from the ventral branches of the 4th and 5th lumbar nerves. Lesions of the sacral plexus cause sensory disturbances on the hamstrings, the entire lower leg and foot. Motor paralysis can be found in the Hüftstreckmuskeln, Kniebeugern and all lower leg and foot muscles -. All the nerves of the plexus exit the pelvis through the foramen infrapiriforme ( caudal portion of the greater sciatic foramen below the piriformis ). Exception is the superior gluteal nerve, the suprapiriform leaves the pelvis through the foramen.

Specifically, we distinguish the following nerves: