Muscles of pelvis

Pelvic Viscera

1. GRETER PELVIS ( false pelvis, pelvis major), 2. LESSER PELVIS (true pelvis, pelvis minor)

Obturator internus N: S1 & S2, L5

F: lateral rotation of thigh (extention)Abduction (flexion)

Piriformis N: S1 & S2, L5F: stability of hip joint, lateral rotation of thigh (extention)Abduction (flexion)

Pelvic wall foramens

pelvic diaphragmLevator ani

Coccygeus

Levator aniO: pubic body, obturator fascia, ischial spine

I: prineal bodyAnorectal junctionExt. sphincter of anusAnococcygeal lig

N: S4

Function: sphincterAnorectal angle

Urogenital hiatus

Coccygeus

O: ischial spineI: lateral border of coccyx & S5

N: S4 & S5

Pelvic outlet

The Pelvic InletThe Pelvic InletAP= true conjugate= 10-11cm

Transverse= 12.5-13cm

Oblique = 12-12.5 cm

Perineal membrane

Episiotomy

Rectum

Anal canal

Urinary bladder

Ureter

Urethra

Interior of bladder

Interureteric crest 2.5 cm

Suprapubic sundage