Muscles of Spine Revision

Question 1

Rectus Abdominis

Answer 1

O: crest of pubis
I: costal cartilage of ribs 5,6,7 and sternum
Lumbar spine - flexion, lateral flexion

Question 2

External Oblique

Answer 2

O: lower 8 ribs
I: ilium and pubis
Lumbar spine - rotation (to opposite side), lateral flexion (to same side)

Question 3

Internal Obliques

Answer 3

O: anterior crest of ilium
I: costal cartilage of ribs 8,9,10
Lumbar spine - rotation (to same side), lateral flexion (to the same side)

Question 4

Transverse Abdominis

Answer 4

O: inner rim of iliac crest, inner surface of cartilage of ribs 7-12
I: crest of pubis, iliopectineal line and linea alba
Maintains abdominal pressure

Question 5

Erector Spinae

Answer 5

Bridging vertebrae on the spine
All regions of the spine - extension and lateral flexion

Question 6

Quadratus Lumborum

Answer 6

O: posterior inner lip of the iliac crest
I: 12th rib and L1-4
Lumbar spine - lateral flexion, posture/stability of spine and pelvis