Iliopsoas

Question 1

Insertion of psoas major/iliacus?

Answer 1

Lesser trochanter

Question 2

Innervation of psoas major?

Answer 2

Direct branches from lumbar plexus (psoas)

L2-L4

Question 3

Action of ilipsoas? (psoas major/iliacus)

Answer 3

Hip joint: flexion and external rotation
Lumbar spine: unilateral contraction (fixed femur): ipsilateral lateral flexion
bilateral contraction: raises trunk from supine position

Question 4

Origin of iliacus?

Answer 4

Iliac fossa

Question 5

Innervation of iliacus?

Answer 5

Femoral n.

L2-L4

Question 6

Origin of psoas major?

Answer 6

Superficial: T12-L4 and associated intervertebral discs (lateral surfaces)
Deep: L1-L5 vertebrae (transverse processes)