Lumbosacral trunk
Encyclopedia
The lumbosacral trunk is nervous tissue that connects the lumbar plexus with the sacral plexus
.
to join the first sacral nerve.
The anterior division of the third sacral nerve divides into an upper and a lower branch, the former entering the sacral plexus
and the latter the pudendal plexus
.
Sacral plexus
-External links:*...
.
Structure
The lumbosacral trunk comprises the whole of the anterior division of the fifth and a part of that of the fourth lumbar nerve; it appears at the medial margin of the psoas major and runs downward over the pelvic brimPelvic brim
The pelvic brim is the edge of the pelvic inlet. It is an approximately apple-shaped line passing through the prominence of the sacrum, the arcuate and pectineal lines, and the upper margin of the pubic symphysis....
to join the first sacral nerve.
The anterior division of the third sacral nerve divides into an upper and a lower branch, the former entering the sacral plexus
Sacral plexus
-External links:*...
and the latter the pudendal plexus
Pudendal plexus
The pudendal plexus is a term used for a compound structure consisting of sacral spinal nerves.Some sources describe it as S2-S4 of the lumbosacral plexus.In some older texts, it is a rough approximation of the coccygeal plexus....
.