Muscles Of The Abdominal Wall

Question 1

Origin: pubic crest and symphysis pubis
Insertion: Costal cartilage of ribs 5-7 and xyphoid process
Action: Flexes vertebral column

Answer 1

Rectus Abdominis muscle

Question 2

Termination of posterior rectus sheath 1/2 way between umbilicus and pubis at level of iliac crest

Answer 2

Acrcuate line

Question 3

Origin: lower 8 ribs
Insertion: Iliac crest and linea alba
Action: Compresses abdominal contents, lateral rotation, draws thorax downward

Answer 3

External abdominal oblique muscle

Question 4

Asis to pubic tubercle, inferior aspect of external abdominal oblique muscle.

Answer 4

Inguinal ligament

Question 5

Origin: iliac crest, inguinal ligament, fascia of back
Insertion: linea alba and costal cartilage of last 3 ribs
Action: Same as EAO

Answer 5

Internal Abdominal Oblique muscle

Question 6

Raises and lowers the testicles, slip off of the internal abdominal oblique muscle

Answer 6

Cremaster muscle

Question 7

Origin: iliac crest, inguinal ligament, lumbar fascia, costal cartilage of last 6 ribs
Insertion: Xyphoid process, linea alba, pubis
Action: Compresses the abdominal contents

Answer 7

Transverse abdominis muscle

Question 8

Origin: iliac crest, lower 3 lumbar vertebrae
Insertion: 12th rib and upper 4 lumbar vertebrae
Action: lateral flexion of vertebrae column

Answer 8

Quadratic lumborum muscle