Pelvic & Perineum Muscles

Question 1

Iliacus

Answer 1

PA: iliac fossa
DA: Lesser trochanter of femur
A: hip flexion
Innervation: Femoral N.

Question 2

Psoas Major

Answer 2

PA: Transverse processes of T12-L4
DA: Lesser trochanter of femur
A: Hip flexion
Innervation: Ventral rami L1-L3

Question 3

Piriformis

Answer 3

PA: Sacrum
DA: Greater trochanter of femur
A: external rotation of femur
Innervation: N. to Piriformis

Question 4

Obturator Internus

Answer 4

PA: Obturator membrane
DA: Greater trochanter of femur
A: External rotation of femur
Innervation: N. to Obturator Internus

Question 5

Coccygeus

Answer 5

Pelvic diaphragm (floor)
PA: Sacrospinous ligament
DA: Coccyx
A: Supports & compresses posterior pelvic floor
Innervation: Ventral rami S4-S5

Question 6

Levator Ani 3 Muscles (part of pelvic floor)

Answer 6

1. Iliococcygeus
2. Pubococcygeus
3. Puborectalis

Question 7

Iliococcygeus

Answer 7

Levator Ani
PA: Ischium & tendinous arch of obturator internus
DA: Coccyx & midline raphe
A: Supports pelvic viscera
Innervation: Levator Ani N. (S4), Inferior Rectal N. (Pudendal N. S#-S4), & Coccygeal Plexus

Question 8

Pubococcygeus

Answer 8

Levator Ani
PA: Pubis & tendinous arch of obturator internus
DA: Coccyx & midline raphe & walls of prostate or vagina
A: Support pelvic viscera & commpress vagine
Innervation: Levator Ani N.. (S4), Inferior Rectal N. (Pudendal N. S#-S4), & Coccygeal Plexus

Question 9

Puborectalis

Answer 9

Levator Ani
PA: Pubis
DA: Wall of rectum
A: Maintain fecal continence
Innervation: Levator Ani N. (S4)

Question 10

Bulbospongiosus

Answer 10

A: Males - Empties urethra, maintains erection, & contracts during ejaculation
Females - constricts vaginal orifice & contributes to erection of clitoris
Innervation: perineal branch of the Pudendal N.

Question 11

Ischiocavernosus

Answer 11

A: Compresses crus during erection
Innervation: Perineal branch of Pudendal N.

Question 12

External Anal Sphincter

Answer 12

A: Closes anal canal & fixes perineal body
Innervation: Inferior rectal branch of the Pudendal N.

Question 13

External Urethral Sphincter

Answer 13

Attachments: surrounds urethra
A: Compresses urethra
Innervation: Perineal branch of Pudendal N.

Question 14

Superficial Transverse Perineal

Answer 14

PA: Inferior ramus of ischium & ischial tuberosity
DA: Inferior aspect of posterior border of perineal membrane to perineal body
A: Support perineal body, support pelvic visceral resist increased intra-abdominal pressure
Innervation: Perineal branch of Pudendal N.

Question 15

Deep Transverse Perineal

Answer 15

PA: Inferior ramus of ischium and ischial tuberosity
DA: Superior aspect of posterior border of perineal membrane to perineal body and external anal sphincter
A: support perineal body, support pelvic viscera, resist increased intra-abdominal pressure
Innervation: Perineal branch of Pudendal N.