Muscles of Anterolateral Abdominal Wall

Question 0

External Oblique

- Insertion

Answer 0

Linea alba, pubic tubercle, anterior half of iliac crest

Question 1

External Oblique

- Origin

Answer 1

External surfaces of 5th-12th ribs

Question 2

External Oblique

- Innervation

Answer 2

Thoraco-abdominal nerves (anterior rami T7-T11) & Subcostal nerve

Question 3

External Oblique

- Action

Answer 3

Action: Compress and support abdominal viscera; flex and rotate trunk

Question 7

Internal Oblique

- Origin

Answer 7

Origin

• Thoracocolumbar fascia
• anterior 2/3rds of iliac crest
• CT deep to inguinal ligament

Question 8

Internal Oblique

- Insertion

Answer 8

• Inferior borders of 10th-12th rib
• Linea alba
• Pubis via con joint tendon

Question 9

Internal Oblique

- Innervation & Action

Answer 9

Thoraco-abdominal nerves (anterior rami T7-T11)
Subcostal & First Lumbar nerve

Compresses and supports abdominal viscera
Flexes and rotates trunk

Question 10

Transversus Abdominus

- Origin

Answer 10

• Internal Sufaces of 7th-12th costal cartilages
• Thoracolumbar fascia
• Iliac crest
• CT deep to inguinal ligament

Question 11

Transversus Abdominis

- Insertion

Answer 11

• Linea alba with aponeurosis of internal oblique
• Pubic crest
• Pubis via con joint tendon

Question 12

Transversus Abdominis

Innervation & Action

Answer 12

• Thoraco-abdominal nerves (anterior rami T7-T11)
• Subcostal & First Lumbar nerve
• Compresses and supports abdominal viscera

Question 13

Rectus Abdominis

- Origin

Answer 13

Pubic symphysis and pubic crest

Question 14

Rectus Abdominis

- Insertion

Answer 14

• Xiphoid process

- 5th-7th costal cartilages

Question 15

Rectus Abdominis

- Innervation

Answer 15

Thoraco-abdominal and subcostal nerves

Anterior rami T7-T12 spinal nerves

Question 16

Rectus Abdominis

- Action

Answer 16

• Flexes trunk (lumbar vert) and compresses abdominal viscera
• Stabilizes and controls tilt of pelvis (antilordosis)