Actions Of The Muscles Connecting Trunk To The Upper Extremity

Question 1

Latissimus Dorsi

Answer 1

Adduction, Extension and Medial Rotation of the Humerus

Question 2

Levator Scapulae

Answer 2

Downward Rotation and Elevation of the Scapula

Question 3

Pectoralis Major (Clavicular Head C5-6; Sternocostal Head C7-T1)

Answer 3

Humeral Adduction, Flexion, Medial Rotation (sternocostal portion assists with extension of the flexed arm)

Question 4

Pectoralis Minor (C5-T1)

Answer 4

Anterior tilt of scapula, assists with depression of the shoulder & forced inspiration

Question 5

Rhomboids (C4-5)

Answer 5

Scapular Retraction, elevation (upper) & downward rotation

Question 6

Serratus Anterior (C5-7)

Answer 6

Scapular Protraction & Upward Rotation

Question 7

Subclavious (C5-6)

Answer 7

Depresses & Stabilizes the Clavicle

Question 8

Trapezius (Accessory N [ CN XI ] motor ; C3-4 Sensory)

Answer 8

Scapular Elevation (Upper), Depression (lower), Retraction (middle), upward Rotation (Upper and Lower)