posterior ab wall

Question 1

where does the psoas major attach?

Answer 1

proximal: transverse process of L vertebrae, sides of T12-L5 and intervening intervertebral discs
distal: lesser trochanter of femur.

Question 2

what is the action of iliacus? which nerve innervates it?

Answer 2

action: flexes thigh, stabilises hip joint, acts with psoas major.
innervation: femoral nerve.

Question 3

where does iliacus attach?

Answer 3

proximal: superior second third of iliac fissa.
distal: lesser trochanter of femur and psoas major tendon.

Question 4

what is the action of quadratus lumborum? which nerve innervates it?

Answer 4

action: extends and laterally flexes vertebral column and fixes 12th rib during inspiration.
innervation: T12 and L1-L4 nerves.

Question 5

what are the attachments of quadratus lumborum?

Answer 5

proximal: medial half of inferior border of 12th rib and tips of L transverse processes.
distal: iliolumbar ligament and internal lip of iliac crest.

Question 6

what is the action of psoas major? what nerve innervates it?

Answer 6

action: flexes thigh, flexes vertebral column laterally, balances trunk.
innervation: L1, L2 L3