Q15 Quadratus Lumborum

Question 1

Give the position of this muscle

Answer 1

On the posterior-lateral abdominal wall, between the pelvis and the 12th rib, lateral and deep to Erector Spinae

Question 2

State the attachments of this muscle

Answer 2

PROXIMAL- Iliolumbar ligament and the adjacent posterior iliac crest. DISTAL- Medial ½ of the lower border of the 12th rib and the lateral part of the transverse processes of all the lumbar vertebrae.

Question 3

List the action(s) of the Quadratus Lumborum muscle

Answer 3

Extends the lumbar spine bilaterally and produces lateral flexion unilaterally to the same side.

Question 4

State 1 functional activity in which the muscle action is important

Answer 4

When standing on 1 leg, it acts on the non-weight bearing side to stop the pelvis dropping downwards. Supports the 12th rib in deep inspiration.