Anatomy - MOINA of the Anterior Abdominal Wall

origin of external oblique

lower 8 ribs

insertion of external oblique

• xiphoid process

• linea alba

• pubic crest

• pubic tubercle

• iliac crest

innervation of external oblique

• lower 6 thoracic nerves

• iliohypogastric and ilioinguinal nerves (L1)

action of external oblique

• supports abdominal contents

• compresses abdominal contents

• assists in flexing and rotation of trunk

• assists in forced expiration, micturition, defecation, parturition, and vomiting

origin of internal oblique

• lumbar fascia

• iliac crest

• lateral 2/3 of inguinal ligament

insertion of internal oblique

• lower 3 ribs and costal cartilages

• xiphoid process

• linea alba

• symphysis pubis

innervation of internal oblique

• lower 6 thoracic nerves

• iliohypogastric and ilioinguinal nerves (L1)

action of internal oblique

• supports abdominal contents

• compresses abdominal contents

• assists in flexing and rotation of trunk

• assists in forced expiration, micturition, defecation, parturition, and vomiting

origin of transversus (abdominis)

• lower 6 costal cartilages

• lumbar fascia

• iliac crest

• lateral 1/3 of inguinal ligament

insertion of transversus (abdominis)

• xiphoid process

• linea alba

• symphysis pubis

innervation of transversus (abdominis)

• lower 6 thoracic nerves

• iliohypogastric and ilioinguinal nerves (L1)

action of transversus (abdominis)

compresses abdominal contents

origin of rectus abdominis

• symphysis pubis

• pubic crest

insertion of rectus abdominis

• 5th, 6th, and 7th costal cartilages

• xiphoid process

innervation of rectus abdominis

lower 6 thoracic nerves

action of rectus abdominis

• compresses abdominal contents and flexes vertebral column

• accessory muscle of expiration

origin of pyramidalis (if present)

anterior surface of pubis

insertion of pyramidalis (if present)

linea alba

innervation of pyramidalis (if present)

12th thoracic nerve

action of pyramidalis (if present)

tenses the linea alba