The Sacral Plexus Flashcards
the sacral plexus lies on which muscle?
anterior to the piriformis muscle
the sacral pelxus is formed by the union of the ventral rami of which spinal nerves?
S1-4
- also receives contributions from L4-5
what is this?
- lumbosacral trunk
Here the ventral rami of spinal nerves S1-4 combine with the L4,5 lumbar roots to form the lumbosacral trunk
what does the sacral plexus supply?
posterior aspect of lower limb plus the perineum
what are the two main branches of the sacral plexus?
main branch to lower limb - sciatic nerve
main branch to perineum - pudenal nerve
the superior and inferior gluteal nerves are smaller motor branches of the..
sacral plexus
what is the root value of the superior gluteal nerve?
L4-S1
what is the root value of the inferior gluteal nerve?
L5-S2
list the muscles supplied by the superior gluteal nerve
- gluteus minimus
- gluteus medius
- tensor fascia lata
the inferior gluteal nerve supplies only one muscle in the gluteal region, name it.
gluteus maximus
what are the major branches of the sacral plexus called?
Some Irish Sailor Pesters Polly
- superior gluteal
- inferior gluteal
- sciatic
- posterior cutaneous nerve of thigh
- pudenal
what are the other brnaches of the sacral plexus which innervate muscles in the lower limb?
- nerve to piriformis
- nerve to quadratus femoris
- nerve to obturator internus
what is the largest nerve in the body?
sciatic nerve
what are the root values of the sciatic nerve?
L4-S3
course of sciatic nerve
