Gray's Anatomy For Students - Pelvis And Perineum

Front 1

Obturator Internus (O)

Back 1

anterolateral wall of true pelvis

Front 2

Obturator Internus (IS)

Back 2

medial surface of great trochanter of femur

Front 3

Obturator Internus (IV)

Back 3

nerve to obturator internus L5, S1

Front 4

Obturator Internus (F)

Back 4

lateral rotation of the extended hip joint; abduction of flexed hip

Front 5

Piriformis (O)

Back 5

anterior surface of sacrum between anterior sacral foramina

Front 6

Piriformis (IS)

Back 6

medial side of superior border of greater trochanter of femur

Front 7

Piriformis (IV)

Back 7

branches from L5, S1, and S2

Front 8

Piriformis (F)

Back 8

lateral rotation of the extended hip joint, abduction of flexed hip

Front 9

Levator Ani (O)

Back 9

posterior aspect of pubic bone, extend across obturator internus as tendinous arch, to ischial spine

Front 10

Levator Ani (IS)

Back 10

superior perineal membrane, posterior part to perineal body around anal canal and anococcygeal ligament

Front 11

Levator Ani (IV)

Back 11

ant ramus of S4 and inferior rectal branch of pudendal nerve

Front 12

Levator Ani (F)

Back 12

pelvic floor, reinforces anal sphincter, creates vaginal sphincter

Front 13

Coccygeus (O)

Back 13

ischial spine and pelvic surface of sacrospinous ligament

Front 14

Coccygeus (IS)

Back 14

lateral margin of coccyx ad related border of sacrum

Front 15

Coccygeus (IV)

Back 15

branches from ant rami of S3 and S4

Front 16

Coccygeus (F)

Back 16

pelvic floor; pulls coccyx forward after defamation

Front 17

Function of Pelvis and Perineum

Back 17

1. supports the body
2. locomotion
3. houses digestive, urinary, and reproductive structures
4. transmits nervous and vascular structures
5. anchors external genitalia