Back Muscles Part 2

Question 1

Levator Scapulae origin

Answer 1

Posterior tubercles of transverse processes of C1-C4 vertebrae.

Question 2

Levator scapulae insertion

Answer 2

Medial border of the scapula, superior to root of scapular spine

Question 3

Levator scapulae innervation

Answer 3

Dorsal scapular nerve c5;
Cervical nerves C3-C4

Blood supply: superficial transverse cervical and dorsal scapular a.

Question 4

Levator scapulae action

Answer 4

Elevates and downwardly rotates scapula;
Scapula fixed: ipsilaterally flexes and rotates head/neck;
Bilaterally extends head and neck

Question 5

Serratus posterior superior origin

Answer 5

Nuchal ligament;

Spinous processes of C7-T3 vertebrae

Question 6

Serratus posterior superior insertion

Answer 6

Superior borders if 2-4 ribs (upper ribs)

Question 7

Serratus posterior superior innervation

Answer 7

Ventral rami T2-T5 thoracic spinal nerves

Question 8

Serratus posterior superior action

Answer 8

Elevates ribs

Question 9

Serratus posterior inferior origin

Answer 9

Spinous process of T11-L2 vertebrae

Question 10

Serratus posterior inferior insertion

Answer 10

Inferior boarders of 8-12 ribs near their angles (lower ribs)

Question 11

Serratus posterior inferior action

Answer 11

Depresses ribs

Question 12

Serratus posterior inferior innervation

Answer 12

Ventral rami of T9-T12 thoratic spinal nerves