Nerves Of Anterolateral Abdominal Wall

Question 0

Course of Thoraco-abdominal

T7-T11

Answer 0

Runs between 2nd & 3rd layers of abdominal muscles

- muscular, lateral, and anterior cutaneous branches enter subcutaneous tissue

Question 1

Origin of Thoraco-abdominal

T7-T11

Answer 1

Origin: distal abdominal parts of lower 5 intercostal nerves

Question 2

Distribution of Thoraco-abdominal

T7-T11

Answer 2

Muscles of anterolateral abdominal wall & overlying skin
(T7-T9 superior to umbilicus)
(T10 around umbilicus)
(T11 below umbilicus)

Question 3

Origin of Subcostal

T12

Answer 3

Anterior ramps of T12 spinal nerve

Question 4

Course of Subcostal

T12

Answer 4

Runs along inferior border of 12th rib

Then onto subumbilical abdominal wall

Question 5

Distribution of Subcostal

T12

Answer 5

Muscles of anterioabdominal wall and muscles of overlying skin midway btw level of umbilicus and iliac crest, inguinal ligament, and pubic crest inferiorly

Question 6

Origin of Iliohypogastric

L1

Answer 6

Superior terminal branch of anterior ramus of L1 spinal nerve

Question 7

Course of Iliohypogastric

L1

Answer 7

Pierces transversus abdominis muscle

Branches pierce external oblique aporneurosis of most inferior abdominal wall

Question 8

Distribution of Iliohypogastric

L1

Answer 8

Skin overlying iliac crest
Upper inguinal & hypogastric regions
Internal oblique & transversus abdominis

Question 9

Origin of Ilio-inguinal

L1

Answer 9

Inferior terminal branch of anterior ramus of L1 spinal nerve

Question 10

Course of Iliohypogastric

L1

Answer 10

Passes btw 2nd and 3rd layers of abdominal muscles

Then transverses inguinal canal

Question 11

Distribution of Iliohypogastric

L1

Answer 11

• Skin of scrotum or labium majus, mons pubis, and adjacent medial aspect of thigh
• Most inferior internal oblique and transverses abdominis