Anterior Abdominal Wall Muscles

Question 1

external obliques (origin)

Answer 1

lower eight ribs

Question 2

external obliques (insertion)

Answer 2

xiphoid process, linea alba, pubic tubercle, pubic crest, and iliac crest

Question 3

external obliques (nerve)

Answer 3

lower six thoracic nerves and iliohypogastric and ilioinguinal nerves (L1)

Question 4

external obliques (action)

Answer 4

supports and compresses abdominal contents; assists in trunk flexion and rotation, micturition, defacation, partuition, vomiting and forced expiration

Question 5

internal obliques (origin)

Answer 5

lumbar fascia, iliac crest, and lateral 2/3 of the inguinal ligament

Question 6

internal obliques (insertion)

Answer 6

lower three ribs and costal cartilages, xiphoid process, linea alba, and symphysis pubis

Question 7

internal obliques (nerve)

Answer 7

lower six thoracic nerves and iliohypogastric and ilioinguinal nerves (L1)

Question 8

internal obliques (action)

Answer 8

supports and compresses abdominal contents; assists in trunk flexion and rotation, micturition, defacation, vomiting, partuition, and forced expiration

Question 9

transversus abdominis (origin)

Answer 9

lower three costal cartilages, lumbar fascia, iliac crest and lateral third of the inguinal ligament

Question 10

transversus abdominis (insertion)

Answer 10

xiphoid process, linea alba, and symphysis pubis

Question 11

transversus abdominis (nerve)

Answer 11

lower six thoracic nerves and iliohypogastric and ilioinguinal nerves (L1)

Question 12

transversus abdominis (action)

Answer 12

compresses abdominal contents

Question 13

rectus abdominis (origin)

Answer 13

pubic crest and symphysis pubis

Question 14

rectus abdominis (insertion)

Answer 14

fifth, sixth, and seventh costal cartilages and xiphoid process

Question 15

rectus abdominis (nerve)

Answer 15

lower six thoracic nerves

Question 16

rectus abdominis (action)

Answer 16

compresses abdominal contents and flexes vertebral column; accessory muscle of forced expiration

Question 17

pyramidalis (origin)

Answer 17

anterior surface of the pubis

Question 18

pyramidalis (insertion)

Answer 18

linea alba

Question 19

pyramidalis (nerve)

Answer 19

12th thoracic nerve

Question 20

pyramidalis (action)

Answer 20

tenses linea alba