sacral spinal nerves Flashcards
as the sacral spinal nerves descend inside of the dura they form what
much of the cauda equina
how many pairs of sacral spinal nerves are there
5
what does each sacral nerve divide into
anterior primary ramus and posterior primary ramus
where do the posterior primary rami of S1-S4 travel through
the four posterior sacral foramina
where does the S5 posterior ramus travel through
the sacral hiatus
what do the posterior primary rami of S1-S3 divide into
medial and lateral branches
what does the medial branches from S1-S3 supply
adjacent multifidi
what do the lateral branches of the posterior primary rami of S1-S3 combine with to supply the skin over the buttocks
L5 and S4
the posterior primary rami of S4 and S5 unite with the coccygeal posterior rami to supply what
the skin over the coccyx
where do the anterior primary rami of S1-S4 travel thorugh
the four anterior sacral foramina
the S5 anterior ramus travels through what?
the sacral hiatus
what do the anterior primary rami of S1-S5 contribute to
the sacral plexus (S1-S4) and the coccygeal plexus (S4,S5)
how many sacral sympathetic ganglia are typical
3-4
how will the anterior primary ramus of each sacral nerve recieve postganglionic sympathetic fibers
gray ramus communicans
