Abdominal Wall

Question 1

Rectus abdominis Innervation

Answer 1

Abdominal portion of intercostal nerves T6-T12

Question 2

Rectus abdominis Function

Answer 2

Flexes trunk, compresses abdomen, stabilizes pelvis

Notes: Surrounded by rectus sheath

Question 3

External oblique Innervation

Answer 3

Abdominal portion of intercostal nerves T7-T11

Question 4

External oblique

Answer 4

Unilateral: flexes trunk to same side, rotates trunk to opposite side. Bilateral: Flexes trunk, compresses and supports abdominal cavity

Notes: Tendon forms superficial most part of rectus sheath, split in external oblique forms superficial inguinal ring

Question 5

Internal oblique Innervation

Answer 5

Abdominal portion of intercostal nerves T6-T12

Question 6

Internal oblique Innervation

Answer 6

Abdominal portion of intercostal nerves T6-T12

Question 7

Internal oblique Function

Answer 7

Unilateral: flexes trunk to same side, rotates trunk to opposite side. Bilateral: Flexes trunk, compresses and supports abdominal cavity

Notes: Forms second deepest layer of rectus sheath. Superior to arcuate line the fascia splits to both superficial and deep surfaces of rectus abdominis

Question 8

Transversus abdominis Innervation

Answer 8

Abdominal portion of intercostal nerves T6-T12

Question 9

Transversus abdominis Function

Answer 9

Unilateral: rotates trunk to same side. Bilateral: Compresses and supports abdominal cavity

Notes: Forms deepest layer of rectus sheath-superior to arcuate line it lies deep to rectus abdominis

Question 10

Diaphragm Innervation

Answer 10

Phrenic nerve; most peripheral sections via intercostal nerves

Question 11

Diaphragm Function

Answer 11

Depresses to enable inspiration (inhaling air)

Notes: Multiple openings in muscle-opening for inferior vena cava at level of T8; opening for esophagus at T10; opening for aorta at T12. Mnemonic: I8 10Eggs At12

Question 12

Iliacus Function

Answer 12

Flexes the thigh at hip

Notes: Forms common iliopsoas tendon

Question 13

Psoas major Function

Answer 13

Flexes the thigh at hip

Notes: Forms common iliopsoas tendon, sometimes a separate belly called the psoas minor is present

Question 14

Iliacus Innervation

Answer 14

Femoral nerve

Question 15

Psoas major Innervation

Answer 15

Anterior rami of spinal nerves L1-L3