Movements of back muscle

Question 1

Extrinsic muscles

Answer 1

Derivatives of hypoaxial myotome
Involved with upper limb and thoracic wall movement
Innervated by ANTERIOR rami of spinal nerves

Question 2

Trapezius

Answer 2

ROTATE shoulders
During ABduction of arm

Supplied by the spinal accessory nerve

Question 3

Latissimus dorsi

Answer 3

Shoulder extension and adduction

Supplied by the thoracodorsal nerve

Question 4

Levator scapulae

Answer 4

Scapular elevation

Question 5

Rhomboid major and minor

Answer 5

Scapular retraction and elevation

Question 6

Serratus posterior superior

Answer 6

Inspiration

Question 7

Serratus posterior inferior

Answer 7

Expiration

Question 8

Intrinsic muscles

Answer 8

Derivatives of epaxial myotome
Located deep
Move the vertebral column and head
Innervated by the POSTERIOR rami of spinal nerves

Question 9

Splenius capitus

Answer 9

Rotate and laterally flex neck

Question 10

Splenius cervicus

Answer 10

Rotate and laterally flex neck

Question 11

Splenius capitus and cervicus

Answer 11

Extend the neck and/or head

Question 12

Erector spinae

Answer 12

Keeps us upright
Extend vertebral column and head

By themselves : laterally flex the vertebral column

Question 13

Suboccipital triangle

Answer 13

Transmits vertebral artery and vein as well as sub occipital nerve.