Muscles of Abdomen and Pelvis

Question 1

Cremaster OIAI

Answer 1

from medial edge of internal oblique to spermatic cord. elevates testis. genitofemoral nerve.

Question 2

Diaphragm attachments

Answer 2

from xiphoid process, inner surface of the lower ribs and costal cartilages, medial and lateral arcuate ligaments and lumbar vertebrae via the crura to the central tendon.

Question 3

Diaphragm innervation

Answer 3

phrenic nerve C3-C5

Question 4

External oblique

Answer 4

from lower 8 ribs to iliac crest and rectus sheath. flexes and rotates trunk, compresses abdominal cavity.

Question 5

Internal oblique

Answer 5

from thoracolumbar fascia to inguinal ligament, iliac crest and rectus sheath. lower thoracic nerve and L1 ventral rami T7-12,L1 iliohypogastric and ilioinguinal, ventral rami.

Question 6

quadratus lumborum

Answer 6

from 12th rib and transverse processes of L1 to 4 to iliolumbar lig. and iliac crest. lumbar plexus rami T12-L3.

Question 7

Rectus abdominis

Answer 7

from xiphoid process and adjacent costal cartilages of ribs 5-7 to pubic crest and tubercle. lower thoracic ventral rami T5-T12.

Question 8

Transversus abdominis

Answer 8

from lower 6 costal cartilages and TLF to inguinal lig. iliac crest & rectus sheath. lower thoracic & L1 ventral rami T7-T12, L1 iliohypogastric and ilioinguinal, ventral divisions.

Question 9

obturator internus

Answer 9

pervic surface of ilium and ischium, obturator membrane to greater trochanter of femur. nerve to obturator internus (L5, S1, S2). ext. rotates thigh.

Question 10

Coccygeus

Answer 10

from ischial spine & sacrospinous lig. to coccyx. supports and compresses posterior pelvic floor. ventral rami S4-S5.

Question 11

name Levator Ani muscles

Answer 11

iliococcygeus, pubococcygeus, puborectalis

Question 12

levator ani

Answer 12

from pubic symphysis, obturator fascia & ischial spine to midline raphe & anococcygeal ligament. supports pelvic viscera and compresses rectum and vagina. pudendal nerve & S4.

Question 13

Bulbospongiosus. actions and innervation

Answer 13

in male empties urethra, maintains erection & contracts during ejaculation; in female constricts vaginal orifice and contributes to erection of clitoris. perineal branch of pudendal nerve.

Question 14

ischiocavernosus

Answer 14

compresses crus during erection. innervation perineal branch of pudendal nerve.

Question 15

sphincter ani externus

Answer 15

closes anal canal & fixes perineal body. inferior rectal branch of pudendal nerve.

Question 16

sphincter urethrae

Answer 16

surrounds urethra. compresses urethra. perineal branch of pudendal nerve.