Post Abdominal Wall

Question 1

Psaos Major- O, I, A (bi, uni), IN

Answer 1

O- Anterolater surface of Vbs T12-L5, ant surfaces of Tps L vert

I- Lesser trochanter

A- Flexes thigh, bi flexes trunk

IN- APRs L1,2,3

Question 2

Iliacus- O, I, A, IN

Answer 2

O- Sup 2/3 of iliac fossa, ala of sacrum, ant sacroiliac fossa

I- Lesser trochanter

A- Flexes thigh, stabalizes hip joint

IN- femoral nerve (l2,3,4)

Question 3

Psoas Minor- O, I, A, IN

Answer 3

O- Anterolateral surfaces of VBs T12-L1 (and IVDs)

I- Iliopubic eminence

A- Flexion of pelvis on lumbar spine

In- APR l1

Question 4

Quadratus lumborum O, I, A (bi, uni), IN

Answer 4

O- Tips of TVPs L vert, medial inferior 1/2 border of 12th riib

I- Internal lip of post portion of iliac crest, iliolumbar lig

A-
Bi- extend spine
uni- laterally flexes lumbar spine

IN- APR T12, L1,2,3

Question 5

Ant layer of thoracolumbar fascia (attachments, features)

Answer 5

A- Attaches medially close to tip of L Tps, sup on the rib 12 and inf on iliac crest

• thinnest layer
• covers ant surface of QL

Question 6

Middle layer of thoracolumbar fascia (attachments, features)

Answer 6

A- medially to tip of L TPs, laterally to IO, TO

-Covers post surface of QL

Question 7

Post layer of thoracolumbar fascia (attachments, features)

Answer 7

A- Medially on L Sps

-runs over errectors, encricles lats