abdominal muscles

Question 1

external oblique origin

Answer 1

external surfaces of ribs 5-12

Question 2

external oblique insertion

Answer 2

linea alba
pubic tubercle
anterior half of iliac crest

Question 3

external oblique action (same as internal oblique)

Answer 3

compress and support abdominal viscera

flex and rotate trunk

Question 4

external oblique innervation

Answer 4

thoraco-abdominal nerves (anterior rami of T7-T11)
subcostal nerve (T12)

Question 5

internal oblique origin

Answer 5

thoracolumbar fascia
anterior 2/3 iliac crest
CT deep to inguinal ligament

Question 6

internal oblique insertion

Answer 6

inferior borders of ribs 10-12
linea alba
pubis via conjoin tendon

Question 7

internal oblique action (same as external oblique)

Answer 7

compress and support abdominal viscera

flex and rotate trunk

Question 8

internal oblique innervation (same as TA)

Answer 8

thoraco-abdominal nerves (anterior rami of T7-T11)

first lumbar nerve (L1)

Question 9

transversus abdominis origin

Answer 9

lateral surfaces of ribs 7-12 costal cartilages
thoracolumbar fascia
iliac crest
CT deep to inguinal ligament

Question 10

transversus abdominis insertion

Answer 10

linea alba with aponeurosis of internal oblique
pubic crest
pectin pubis via conjoin tendon

Question 11

transversus abdominis action

Answer 11

compress and support abdominal viscera

Question 12

transversus abdominis innervation (same as int oblique)

Answer 12

thoraco-abdominal nerves (anterior rami T7-T11)

first lumbar nerve (L1)

Question 13

rectus abdominis origin

Answer 13

pubic symphysis

pubic crest

Question 14

rectus abdominis insertion

Answer 14

xiphoid process

costal cartilages 5-7

Question 15

rectus abdominis action

Answer 15

flexes trunk (lumbar vertebrae)
compresses abdominal viscera (antagonist to diaphragm)
stabilizes and controls pelvic tilt (anti-lordosis)

Question 16

rectus abdominis innervation

Answer 16

thoraco-abdominal nerves (anterior rami of inferior six thoracic nerves T7-T12)