Muscles of the Pelvis & Perineum

Question 1

Iliacus attachments

Answer 1

From: iliac fossa
To: lesser trochanter of femur

Question 2

Iliacus actions

Answer 2

flexion of thigh at hip joint

Question 3

Iliacus innervation

Answer 3

Femoral nerve

Question 4

Psoas major attachments

Answer 4

From: transverse processes of T12-L4
To: lesser trochanter of femur

Question 5

Psoas major actions

Answer 5

flexion of thigh at hip joint

Question 6

Psoas major innervation

Answer 6

ventral rami L1-L3

Question 7

Piriformis attachments

Answer 7

From: sacrum
To: Greater trochanter of femur

Question 8

Piriformis actions

Answer 8

Lateral rotation of thigh at hip joint

Question 9

Piriformis innervation

Answer 9

Nerve to piriformis

Question 10

Obturator internus attachments

Answer 10

From: obturator membrane
To: Greater trochanter of femur

Question 11

Obturator internus actions

Answer 11

Lateral rotation of thigh at the hip joint

Question 12

Obturator internus innervation

Answer 12

Nerve to obturator internus

Question 13

Coccygeus attachments

Answer 13

From: sacrospinous ligament
To: Coccyx

Question 14

Coccygeus actions

Answer 14

supports & compresses posterior pelvic floor

Question 15

Coccygeus innervation

Answer 15

ventral rami S4-5

Question 16

Iliococcygeus attachments

Answer 16

From: ischium & tendinous arch of obturator internus
To: coccyx & midline raphe

Question 17

Iliococcygeus action

Answer 17

Support pelvic viscera

Question 18

Iliococcygeus innervation

Answer 18

levator ani nerve (S4), inferior rectal nerve (pudendal S3-4), coccygeal plexus

Question 19

Pubococcygeus attachments

Answer 19

From: pubis & tendinous arch of obturator internus
To: coccyx & midline raphe & walls of prostate or vagina

Question 20

Pubococcygeus actions

Answer 20

Support pelvic viscera
Compress vagina

Question 21

Pubococcygeus innervation

Answer 21

levator ani nerve (S4), inferior rectal nerve (pudendal S3-4), coccygeal plexus

Question 22

Puborectalis attachments

Answer 22

pubis & wall of rectum

Question 23

Puborectalis actions

Answer 23

maintain fecal continence

Question 24

Puborectalis innervation

Answer 24

levator ani nerve (S4)

Question 25

Bulbospongiosus actions

Answer 25

Male:
*empties urethra
*maintains erection
*contracts during ejaculation
Female:
*constrics vaginal orifice
*contributes to erection of clitoris

Question 26

Bulbospongiosus innervation

Answer 26

perineal branch of pudendal nerve

Question 27

Ischiocavernosus actions

Answer 27

compresses crus during erection

Question 28

Ischiocavernosus innervation

Answer 28

perineal branch of pudendal nerve

Question 29

external anal sphincter action

Answer 29

closes anal canal
fixes perineal body

Question 30

External anal sphincter innervation

Answer 30

inferior rectal branch of the pudendal nerve

Question 31

External urethral sphincter attachments

Answer 31

Surrounds urethra

Question 32

External urethral sphincter actions

Answer 32

Compresses urethra

Question 33

External urethral sphincter innervation

Answer 33

perineal branch of pudendal nerve

Question 34

Superficial transverse perineal attachments

Answer 34

From: inferior ramus of ischium and ischial tuberosity
To: inferior aspect of posterior border of perineal membrane to perineal body

Question 35

Superficial transverse perineal actions

Answer 35

Support perineal body
support pelvic viscera
resist increased intraabdominal pressure

Question 36

Superficial transverse perineal innervation

Answer 36

perineal branch of the pudendal nerve

Question 37

Deep transverse perineal attachments

Answer 37

From: inferior ramus of ischium and ischial tuberosity
To: superior aspect of posterior border of perineal membrane
To: perineal body and external anal sphincter

Question 38

Deep transverse perineal actions

Answer 38

support perineal body
support pelvic viscera
resist increased intraabdominal pressure

Question 39

Deep transverse perineal innervation

Answer 39

perineal branch of the pudendal nerve