Abdominal muscles

Question 1

External oblique

Answer 1

Origin: Ribs 6-12

Insertion: Anterior iliac crest/Pubis

Aponeurosis linea alba

Actions: Compression abdominal cavity

Flex/rotate trunk

Innervation: Lower intercostal nerve

Question 2

Internal oblique

Answer 2

Origin: Anterior iliac crest

Thoracolumbar fascia

Lateral 1/2 inguinal ligament

Iliopsoas fascia

Insertion: Lower ribs

Aponeurosis linea alba

Actions: Compression abdominal cavity

Flex/rotatation trunk

Innervation: Lower intercostal nerve

L1- iliohypogastric/ilioinguinal

Question 3

Transverse abdominis

Answer 3

Origin: Anterior iliac crest

Tips lower 6 ribs

Lateral park inguinal ligament

Thoracolumbar fascia

Insertion: Aponeurosis linea alba

Actions: Compression abdominal cavity

Innervation: Lower intercostal nerves

L1- iliohypogastric/ilioguinal

Question 4

Rectus abdominis

Answer 4

Origin: Pubic crest

Ligaments pubic symphysis

Insertion: Xiphiod process

Ribs 5-7

Action: Flex trunk

Innervation: Lower intercostal nerves

Question 5

Quadratus lumborum

Answer 5

Origin: Medial part iliac crest

Insertion: Rib 12

Lower lumbar vertebrae

Actions: Lateral flex vertebral column

Fix last rib form stable base contract diaphragm

Innervation: T12, L1-L3