Superficial Posterior Thoraco-appendicular (Extrinsic Shoulder) Muscles

Question 0

Trapezius lateral attachment

Answer 0

Lateral 1/3 of clavicle, acromion, and spine of scapula

Question 1

Trapezius medial attachment

Answer 1

Medial 1/3 of superior nuchal line, EOP, nuchal ligament, and spinous processes of C7-T12 vertebrae

Question 2

Trapezius innervation

Answer 2

Spinal accessory nerve (CN XI: motor fibers), and C3, C4 spinal nerves (pain and propioceptive fibers)

Question 3

Trapezius main actions

Answer 3

Superior part elevates, inferior part depresses, and middle part retracts scapula. Inferior + superior parts together rotate glenoid cavity superiorly

Question 4

Latissimus dorsi medial attachment

Answer 4

Spinous processes of inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest, and inferior 3-4 ribs

Question 5

Latissimus dorsi lateral attachment

Answer 5

Floor of intertubercular sulcus of humerus

Question 6

Latissimus dorsi innervation

Answer 6

Thoracodorsal nerve (C6, C7, C8, keep the latts great)

Question 7

Latissimus dorsi main actions

Answer 7

Extends, adducts, and medially rotates shoulder joint; raises body towards arms during climbing

Question 8

Levator scapulae medial attachment

Answer 8

Posterior tubercles of transverse processes of C1-C4 vertebrae

Question 9

Levator scapulae lateral attachment

Answer 9

Medial border of scapula superior to root of spine

Question 10

Levator scapulae innervation

Answer 10

Dorsal scapular (C5) and C3, C4 cervical spinal nerves

Question 11

Levator scapulae main actions

Answer 11

Elevates scapula and tilts its glenoid cavity inferiorly by rotating scapula

Question 12

Rhomboid medial attachment

Answer 12

Minor: nuchal ligament, spinous processes of C7 and T1 vertebrae
Major: spinous processes of T2-T5 vertebrae

Question 13

Rhomboid lateral attachment

Answer 13

Minor: triangular area at medial end of scapula spine
Major: medial border of scapula from level of spine to inferior angle

Question 14

Rhomboid innervation

Answer 14

Dorsal scapular nerve (C5) and C4

Question 15

Rhomboid main actions

Answer 15

Retract scapula and rotate it to de press glenoid cavity, fix scapula to thoracic wall