muscular system week 1 (muscles that move the arm)

Question 1

pectoralis major

Answer 1

location: anterior muscle of the trunk that originates on the clavicle, sternum, and upper ribs and inserts laterally on the greater tubercle of the humerus
action: flexes, adducts, and medially rotates the arm

Question 2

latissimus dorsi

Answer 2

location: posterior muscle of the trunk that originates on the lower thoracic vertebrae and inserts on the anterior proximal humerus
action: adducts, extends, and medially rotates the arm

Question 3

deltoid

Answer 3

location: large shoulder muscle that originates on the scapula posteriorly and clavicle anteriorly. it inserts on the deltoid tuberosity of the arm
action: medial fibers abduct the arm; anterior fibers flex and medially rotate arm; posterior fibers extend and laterally rotate arm

Question 4

supraspinatus

Answer 4

location: originates on the supraspinatous fossa of the scapula and inserts on the greater tubercle of the humerus
action: abducts the arm

Question 5

infraspinatus

Answer 5

location: originates on the infraspinous fossa of the scapula and inserts on the greater tubercle of the humerus
action: laterally rotates and adducts the arm

Question 6

teres major

Answer 6

location: originates of the inferior posterior surface of the scapula and inserts on the anterior proximal humerus
action: extends, adducts, and medially rotates the arm

Question 7

teres minor

Answer 7

location: originates on inferior lateral border of scapula and inserts on greater tubercle of the humerus
action: extends and laterally rotates the arm

Question 8

subscapularis

Answer 8

location: originates on the subscapular fossa of scapula and inserts on the lesser tubercle of the humerus
action: medially rotates the arm