mucle action of superficial back muslces

Question 1

latissimus doris

Answer 1

extend , adductor, internal rotate the shoulder (glenohumeral joint)

Question 2

trapezius (upper fibers)

Answer 2

bilaterally: extend the head and neck
unilaterally: laterally fled the head and neck to same side
rotate the head and neck to the opposite side
elevate the scapula
upwardly rotate the scapula

Question 3

trapezius (middle fibers)

Answer 3

adduct the scapula
stabilize the scapula

Question 4

trapezius (lower fibers)

Answer 4

depress the scapula
upwardly rotate the scapula

Question 5

levator scapulae

Answer 5

unilaterally: elevate and downwardly rotate the scapula

Question 6

rhomboid major and minor

Answer 6

adduct/retract the scapula
downwardly rotate the scapula
fix scapula to thoracic wall