sacral plexus

Question 1

nerve to the quadratus femoris and gemellis inferior

Answer 1

fibers from L4 L5 and S1 muscles contribute to lateral rotation and adduction of the thigh

Question 2

nerve to the obturator internus and gemellus superior

Answer 2

fibers from L5 S1 and S2

these muscles contribute to lateral rotation and abduction of the thigh

Question 3

pudendal nerve

Answer 3

fibers from S2 S3 and S4
gives branches off inside the pudendal canal
inferior rectal nerve
perineal nerve
terminal branch dorsal nerve of the penis or clitoris

Question 4

inferior rectal nerve

Answer 4

sensory information from skin around anus and inferior 2/3 of the anal canal
motor supply to the eternal anal sphincter

Question 5

perineal nerve

Answer 5

divides into deep and superficial branches
deep - supply external anal sphincter, bulbospongiosus, ischiocavernosus, superficial transverse perineus
superficial - carry sensory fibers to posterior scrotum urethral mucosa of the bulb of the penis (men)
labium majus, external urethral orifice and vestibule (women)

Question 6

dorsal nerve of the penis/clitoris

Answer 6

supplies the deep transverse perineus and urethral sphincter muscles
also carries sensory fibers from corpus cavernosum glans penis and skin covering the penis (men) or corpus cavernosum and clitoris (women)

Question 7

muscular branches

Answer 7

fibers from S4

supply levator ani and coccygeus muscles

Question 8

nerve to the piriformis

Answer 8

fibers from S1 and S2
supplies piriformis (from posterior division of sacral plexus)

Question 9

superior gluteal nerve

Answer 9

fibers from L4 L5 and S1
superior branch supplies the gluteus medius and minimus
inferior branches supply gluteus medius minimus and tensor fascia lata

Question 10

inferior gluteal nerve

Answer 10

fibers from L5 S1 and S2

innervates gluteus maximus

Question 11

perforating cutaneous nerve

Answer 11

fibers from S2 and S3
travels through the sacrotuberous ligament supplying the lower medial aspect of the buttocks (possibly formed off a branch of the pudendal nerve)