Myology

Question 1

Pelvic Diaphragm Muscles and Innervation

Answer 1

Levator Ani Ms. (N to Levator Ani)

Coccygeus M. (N to Coccygeus)

Question 2

Levator Ani Muscles

Answer 2

Puborectalis M
Pubococcygeus M
Iliococcygeus M

Question 3

Accessory Pubococcygeus Muscles

Male and Female

Answer 3

Puboprostaticus, Puboperinealis, Puboanalis

Pubovaginalis, Puboperinealis, Puboanalis

Question 4

External Anal Sphincter Muscle

Type and Innervation

Answer 4

Skeletal Muscle

Inferior Rectal N

Question 5

Internal Anal Sphincter Muscle

Type and Innervation

Answer 5

Smooth Muscle

Pelvic Splanchnic Ns

Question 6

Lateral Pelvic Wall Muscles

Innervation and Action

Answer 6

Obturator Internus M
N. to Obturator Internus
Rotates thigh laterally

Piriformis M
N to Piriformis
Rotates thigh laterally and abducts thigh

Question 7

Urogenital Diaphragm Muscles and Innervation

Answer 7

External Urethral Sphincter
Compressor Urethrae M (Dorsal N. of Penis/Clitoris)
Urethrovaginal M (Dorsal N. of Clitoris)

Deep Transverse Perineal M
Deep Perineal N (in men)
DTPM is smooth muscle in women

Question 8

Superficial Perineal Muscles

Action and Innervation

Answer 8

Deep Perineal Ns.

Superficial Transverse Perineal M
Laterally holds perineal body

Bulbospongiosus M
Anterior hold of perineal body, ejaculation, erection

Ischiocavernosus M
Maintains erection and holds crura