Muscles of the abdominal wall

Question 1

Arterial supply of Iliacus

Answer 1

Lumbar arteries

Question 2

Innervation and action of iliacus

Answer 2

Femoral nerve- L2-L4

Flexion of the thigh at the hip joint.

Question 3

Origin and insertion of Iliacus

Answer 3

Origin
- Upper two thirds of iliac fossa

Insertion
- Lesser trochanter of the femur.

Question 4

Arterial supply of Psoas major

Answer 4

Lumbar branch of iliolumbar artery

Question 5

Innervation and action of Psoas major

Answer 5

L1-3 of the lumbar plexus

Flexion of thigh at the hip joint.

Question 6

Arterial supply of quadratus lumborum

Answer 6

Lumbar arteries

Lumbar branch of iliolumbar artery

Question 7

Innervation and action of Quadratus lumborum

Answer 7

Depression of rib cage (together)

Lateral flexion of the trunk

Innervation: T12-L4

Question 8

Arterial supply to external oblique

Answer 8

Intercostal arteries - cranial portion

Deep circumflex iliac/ iliolumbary artery- caudal portion

Question 9

Innervation and action of external oblique

Answer 9

T7-T12

Contralateral rotation of the trunk

Compression of abdominal viscera

Question 10

Origin and insertion of external oblique

Answer 10

Insertions:

• Iliac crest
• Pubic tubercle
• Linea alba

Origin:
Lower 8 ribs (5-12)

Question 11

Origin and insertion of internal oblique

Answer 11

Origins:

• Lateral 2/3 of inguinal ligament
• Iliac crest
• Thoracolumbar fascia

Insertions:

• Linea alba
• Pubic crest
• Lowe 3-4 ribs

Question 12

Arterial supply of internal oblique

Answer 12

Subcostal arteries

Question 13

Innervation and action of internal oblique

Answer 13

Compression of abdominal viscera

Ipsilateral rotation of trunk

Question 14

Arterial supply of Arterial supply of internal oblique

Answer 14

Subcostal arteries

Question 15

Origins and insertion of the transversus abdominis

Answer 15

Origins:

• Iliac crest (medial lip)
• Lateral third of inguinal ligament
• Costal cartilages of lower six ribs (T7-12)

Insertion

• Pubic crest
• Linea alba
• Pectineal line

Question 16

Innervation and action of transversus abdominis

Answer 16

T7-12, L1

Compresses abdominal viscera

Question 17

Rectus abdominis arterial supply

Answer 17

Inferior epigastric artery

Question 18

Origins and insertion of the rectus abdominis

Answer 18

Insertion:

• Costal cartilage of ribs 5-7
• Xiphoid process

Insertion:
- Pubic crest, tubercle and symphysis

Question 19

Innervation and action of rectus abdominis

Answer 19

Innervation:
T7-12

Actions:

• Tension of abdominal wall
• Flexion of lumbar spine
• Compression of abdominal viscera

Question 20

Origin and insertion of Quadratus lumborum

Answer 20

Origin
- Rib 12

Insertion
- Posterior border of iliac crest

It is a continuation of the transversus abdominis

Question 21

Origin and insertion of psoas major

Answer 21

Origin: T12-L5

Insertion: Lesser trochanter of the femur

Question 22

Origin and insertion of diaphragm

Answer 22

Origin:

• Sternum
• Lumbar vertebrae
• Costal cartilage

Insertion:
- Central tendon