Sacral Plexus

Question 1

Coccygeus Muscle

Answer 1

aka Ischiococcygeus Muscle

Anterior primary rami S3, S4

Question 2

Levator Ani Muscle

Answer 2

Anterior primary rami S3, S4

Perineal branch of pudendal N

Question 3

Sacral Plexus

Answer 3

Lumbosacral plexus L4, L5

Anterior primary rami S1-S4

Question 4

Branches of the sacral plexus which supply the buttock and lower limb

Answer 4

Superior gluteal N
Inferior gluteal n
Sciatic N
Nerve to Obturator Internus Muscle
Nerve to quadratus femoris muscle
Posterior cutaneous nerve to thigh

Question 5

Superior gluteal N

Answer 5

L4, L5, S1 - Gluteus medius, gluteus minimus, and tensor fasciae latae muscle (Not gluteus maximus*)

Question 6

Inferior gluteal N

Answer 6

L5, S1, S2 - Gluteus maximus*

Question 7

Sciatic N

Answer 7

L4 - S3 - Numerous structures in the lower extremity

Question 8

Nerve to obturator internus muscle

Answer 8

L5, S1, S2 - Obturator internus and superior gamellus muscles

exits thru the greater sciatic foramen inferior to piriformis and then enters thru the perineum thu the lesser sciatic foramen

Question 9

Nerve to quadratus femoris muscle

Answer 9

L5, S1 - quadratus femoris and inferior gemellus muscles

Question 10

Posterior cutaneous nerve of thigh

Answer 10

S1, S2, S3 - sensory to part of gluteal region and perineum (anal triangle)

Question 11

Branches to the Sacral Plexus which supply the pelvis

Answer 11

Nerve to piriformis muscle
Nerves to levator ani and coccygeus muscles
nerve to external anal sphincter muscle
Pudendal Nerve

Question 12

Coccygeal plexus

Answer 12

anterior primary rami S4, S5 and the coccygeal Nerve

Supplies the sacrococcygeal joint, the coccyx, and overlying skin

Question 13

Nerve to piriformis muscle

Answer 13

S1, S2

Question 14

nerves to levator ani and coccygeus muscle

Answer 14

S3, S4

Question 15

Nerve to external anal sphincter muscle

Answer 15

S4

Question 16

Pudendal nerve

Answer 16

S2, S3, S4 - Gives off important branches to the perineum