Posterior Abdominal Wall

Question 1

Psoas Major

Answer 1

O: transverse process, bodies and IVD T12-L5
I: lesser trochanter with iliacus
A: flexes hip, lateral flexion of trunk and flexion of trunk
N: ventral primary rami L1-L3

Question 2

Psoas Minor

Answer 2

O: bodies of vertebrae T12-L1 and disc in-between
I: pubic bone
A: flexion of pelvis and vertebral column
N: ventral primary ramus L1

Question 3

Iliacus

Answer 3

O: iliac fossa
I: lesser trochanter with psoas major
A: hip flexion
N: femoral

Question 4

Quadratus lumborum

Answer 4

O: iliac crest, iliolumbar ligament, and transverse process of lower lumbar vertebrae
I: 12th rib, transverse process of upper lumbar vertebrae
A: flexion of trunk laterally, extend vertebral column, elevate hip, stabilize 12th rib against inspiration
N:subcostal and upper lumbar ventral primary rami