Sacral Spinal Nerves Flashcards
Nerves descend from inside what
the dura
How many sacral spinal nerves are there
5 pair
Descending nerves form what structure
cauda equina
Each sacral spinal nerve divides into what
anterior primary ramus
posterior primary ramus
The posterior primary rami of S1-S4 travel through what structure
4 posterior sacral foramina
The S5 posterior ramus travels through what structure
sacral hiatus
The sacral posterior rami increases or decreases in size from superior to inferior
decreases in size
The posterior primary rami of S1-S3 divide into what
medial branch
lateral branch
The lateral branch of the posterior primary rami combine with branches from where to supply skin over the butt
L5 and S4
The posterior primary rami of S4 and S5 unite with what to supply skin over the coccyx
coccygeal posterior rami
the anterior primary rami of S1-S4 travel through what structures
4 anterior sacral foramina
S5 anterior ramus travels through what structure
Sacral hiatus
Anterior primary rami will contribute to which plexuses
Sacral plexus (S1-S4) Coccygeal plexus (S4, S5)
How many sacral sympathetic ganglia are there usually
3 or 4
Anterior primary ramus of each sacral nerve will receive what type of fibers from gray ramus communicans
postganglionic sympathetic
