CH 13: Muscles of the Pectoral Girdle and Arm

Question 1

Need to know ID, Origin and Insertion, and Action: deltoid

Answer 1

origin: scapula (acromion and spine) and clavicle

insert: deltoid tuberosity of humerus

action: abduction of arms

Question 2

Need to know ID, Origin and Insertion, and Action: supraspinatus

Answer 2

origin: supraspinous fossa

insert: greater tubercle of humerus

action: assist in abduction

Question 3

Need to know ID, Origin and Insertion, and Action: infraspinatus

Answer 3

origin: infraspinous fossa

insert: greater tubercle of humerus

action: laterally rotate the arm

Question 4

Need to know ID, Origin and Insertion, and Action: teres minor

Answer 4

origin: lateral border of scapula

insert: greater tubercle of humerus

action: assist in lateral rotation of arm

Question 5

Need to know ID, Origin and Insertion, and Action: teres major

Answer 5

origin: inferior part of scapula

insert: intertubercular sulcus

action: medial rotation of arm and adduction

Question 6

Need to know ID, Origin and Insertion, and Action: triceps

Answer 6

origin: long head on glenoid cavity and medial/lateral on posterior end of humerus

insert: olecranon

action: extension of arm, forearm extensor

Question 7

Need to know ID, Origin and Insertion, and Action: subscapularis

Answer 7

origin: subscapular fossa

insert: lesser tubercle

action: rotation of arm

Question 8

Need to know ID, Origin and Insertion, and Action: biceps brachii

Answer 8

origin: long head = glenoid cavity and short head = corocoid process of scapula

insert: radial tuberosity

action: arm flexion and primary mover of supination