Muscle Chart: Anterolateral Abdomen

Question 1

External Oblique

Origin, Insertion, Innervation, Blood Supply

Answer 1

Origin: External surface of the 5th-12th ribs

Insertion: Anterior part of the iliac crest and abdominal aponeurosis to linea alba

Innervation: Thoraco-abdominal nerves (T7-T11) and subcostal nerves (T12)

Blood Supply: Intercostal artery and superior and inferior epigastric arteries

Question 2

External Oblique Movements

Answer 2

Unilaterally: Ipsilateral side flex vertebral column; ipsilaterally rotate vertebral column contra-laterally

Bilaterally: Flex the vertebral column and compress abdominal contents

Question 3

Rectus Abdominis

Origin, Insertion, Innervation, Blood Supply

Answer 3

Origin: Pubic crest and pubic symphysis

Insertion: Cartilage of 5th, 6th and 7th ribs and xiphoid process

Innervation: Thoraco-abdominal nerves (anterior rami T6-T12)

Blood Supply: Superior and inferior epigastric arteries

Question 4

Rectus Abdominis Movements

Answer 4

Flex the vertebral column and tilt the pelvis posteriorly

Question 5

Internal Oblique

Origin, Insertion, Innervation, Blood Supply

Answer 5

Origin: Lateral inguinal ligament, iliac crest and thoracolumbar fascia

Insertion: Internal surface of lower 3 ribs, abdominal aponeurosis to linea alba

Innervation: Thoraco-abdominal nerves (T6-T12) and first lumbar nerve

Blood Supply: Intercostal arteries and iliolumbar artery

Question 6

Internal Oblique Movements

Answer 6

Unilaterally: Ipsilateral side flex of vertebral column and rotation of vertebral column

Bilaterally: Flex vertebral column and compress abdominal contents

Question 7

Transverse Abdominis

Origin, Insertion, Innervation, Blood Supply

Answer 7

Origin: Lateral inguinal ligament, iliac crest, thoracolumbar fascia and internal surface of lower 6 ribs

Insertion: Internal surface of the lower 3 ribs, abdominal aponeurosis to linea alba

Innervation: Thoraco-abdominal nerves (T6-T12) and first lumbar nerve

Blood Supply: Intercostal arteries and iliolumbar artery

Question 8

Transverse Abdominis Movements

Answer 8

Compress abdominal contents