O&I Posterior Wall Abdominal Cavity

Question 1

quadratus lumborum origin

Answer 1

Medial aspect of iliac crest and iliolumbar ligament (from transverse process of T5)

Question 2

quadratus lumborum insertion

Answer 2

Inferior side of rib 12 and transverse process of lumbar vertebrae

Question 3

quadratus lumborum nerve

Answer 3

Lumbar plexus

Question 4

quadratus lumborum action

Answer 4

unilaterally: lateral flexion same side (hip hiker)
bilaterally: depression and stabilization of rib 12. Contraction during inspiration and assists with forced exhalation for deep breathing.

Question 5

Psoas major origin

Answer 5

Posterior abdominal wall (lumbar transverse processes, intervertebral discs, and adjacent bodies from T12-L5 and tendinous arches between these points

Question 6

Psoas major insertion

Answer 6

Lesser trochanter of femur

Question 7

Psoas major nerve

Answer 7

Lumbar plexus (Anterior rami L1-L2 mainly and some L3)

Question 8

Psoas major action

Answer 8

Flexor of hip and trunk

Question 9

Iliacus origin

Answer 9

Posterior abdominal wall (iliac fossa)

Question 10

Iliacus insertion

Answer 10

Lesser trochanter of femur

Question 11

Iliacus nerve

Answer 11

Femoral nerve from lumbar plexus

Question 12

Ilacus action

Answer 12

Hip flexor

Question 13

Psoas Minor origin

Answer 13

T12 and anterior aspect of psoas majr

Question 14

Psoas minor insertion

Answer 14

Iliopubic eminence

Question 15

Psoas minor nerve

Answer 15

Lumbar plexus

Question 16

Psoas minor action

Answer 16

Flexion of lumbar vertebrae, trunk flexor, weak hip flexor