Posterior Abdominal Wall

Question 0

Insertion of Psoas major

Answer 0

By a strong tendon to lesser trochanter of femur

Question 1

Origin of Psoas Major

Answer 1

Transverse processes of lumbar vertebrae; sides of bodies of T12-S1 vertebrae and intervening IV discs

Question 2

Innervation of Psoas Major

Answer 2

Lumbar plexus via anterior branches of nerves L2-L4

Question 3

Actions of Psoas Major

Answer 3

Acting inferiorly with ilacaus, 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 Iliacus

Answer 4

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

Question 5

Insertion of Iliacus

Answer 5

Lesser trochanter of femur and shaft inferior to it and to psoas major tendon

Question 6

Innervation of Iliacus

Answer 6

Femoral nerve L2-L4

Question 7

Actions of Iliacus

Answer 7

Flexes thigh and stabilizes hip joint; acts with psoas major

Question 8

Origin of Quadratus Lumborum

Answer 8

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

Question 9

Insertion of Quadratus Lumborum

Answer 9

Iliolumbar ligament and inteernal lip of iliac crest

Question 10

Innervation of Quadratus Lumborum

Answer 10

Anterior branches of T12 and L1-L4 nerves

Question 11

Actions of Quadratus Lumborum

Answer 11

Extends and laterally flexes vertebral column; fixes 12th rib during inspiration