Nerves of the Pelvis and Gluteal Region Flashcards
what is the lumbar plexus formed by?
ventral primary rami of L1-L3 and part of L4
and a contribution from the ventral primary rami of T12
what is the sacral plexus formed by?
part of L4 and all of L5, S1-S3, and part of S4
what is the coccygeal plexus formed by?
S4, S5 and anterior coccygeal rami
what muscle is the lumbar plexus found in?
psoas major muscle
the anterior division of the lumbar plexus has what branches?.
(for flexors)
obturator n. L2-4
accessory obturator n. L3-4
the posterior division of the lumbar plexus has what branches?.
(for extensors and abductors)
genitofemoral L1-2
lateral femoral cutaneous L2,3
femoral L2-4
what levels is iliohypogastric?
L1
what level is ilioinguinal?
L1
which nerve passes thru the psoas major to run on its venral surface?
genitofemoral L1-2
what nerve levels are lateral femoral cutaneous n.?
L2-L3
what nerve levels are obturator nerve?
L2-4
*pases medial to psoas major muscle
what nerve levels are accessory obturator nr.?
L3-4
what nerve levels are femoral n.?
L2-4
what nerve levels are the lumbosacral trunk?
L4-5
what is the nerve furcalis?
anterior (ventral) ramus of L4 because it is divded btwn the lumbar and sacral plexuses
Name the anterior divisions of the sacral plexus.
- nerve to quadratus femoris (& inferior gemellus)
- nerve to obturator internus (& superior gemellus)
- tibial nerve
Name the posterior divisions of the sacral plexus.
- common peroneal n.
- nerve to piriformis
- inferior gluteal n.
- superior gluteal n.
levels for nerve to quadratus femoris and inferior gemellus?
L4-S1
levels for nerve to obturator internus and superior gemellus?
L5-S2
levels for nerve to piriformis?
S1,S2
levels for superior gluteal n.?
L4-S1
levels for inferior gluteal nerve?
L5-S2
levels for sciatic n. ?
L4-S3
the superior gluteal nerve is divided into a superior and inferior branch. what does each innervate?
superior br.- innervates gluteus minimus
inferior br.- innervates gluteus medius, gluteus minimus, and tensor fascia latae
recall what nerve innervates tensor fascia lata.
inferior br. of superior gluteal nerve (L4-S1)
recall what innervates gluteus maximus.
inferior gluteal nerve (L5-S2)
what nerve levels does common peroneal nerve come from?
posterior division L4-S2
what nerve levels does tibial nerve come from?
anterior division L4-S3
