Muscles Of The Posterior Abdominal Wall

Question 0

Insertion of the psoas major

Answer 0

By a strong tendon to lesser trochanter of femur

Question 1

Origin of the psoas major

Answer 1

Transverse processes of lumbar vertebrae

Sides of bodies of T12-S1 vertebrae and intervening IV discs

Question 2

Innervation of the psoas major

Answer 2

Lumbar plexus via anterior branches of nerves L2-L4

Question 3

Actions of the psoas major

Answer 3

Acting inferiorly with iliacus: flexes thigh
Acting superiorly: flexes vertebral column laterally to balance the trunk.
When sitting: acts inferiorly with iliacus to flex trunk

Question 4

Origin of the iliacus

Answer 4

Superior two thirds of iliac fossa
Ala of sacrum
Anterior sacro-iliac ligaments

Question 5

Insertion of the iliacus

Answer 5

Lesser trochanter of femus and shaft inferior to it, and psoas major tendon

Question 6

Innervation of the iliacus

Answer 6

Femoral nerve, L2-L4

Question 7

Actions of the iliacus

Answer 7

Flexes thigh and stabilizes hip joint.

Acts with psoas major

Question 8

Origin of quadratus lumborum

Answer 8

Medial half of interior border of 12th rib and tips of lumbar transverse processes

Question 9

Insertion of quadratus lumborum

Answer 9

Iliolumbar ligament and internal lip of iliac crest

Question 10

Innervation of quadratus lumborum

Answer 10

Anterior branches of T12 and L1-L4 nerves

Question 11

Action of quadratus lumborum

Answer 11

Extends and laterally flexes vertebral column

Fixes 12th rib during inspiration