Glenohumeral Joint Muscles

Question 1

state the action(s) of the - pectoralis major (3, 4)

Answer 1

1. CF - flexion, internal rotation, adduction

2. SF - adduction, horizontal flexion, internal flexion, extension (from a flexed position)

Question 2

state the action(s) of the - coracobrachialis (2)

Answer 2

adduction, horizontal flexion

Question 3

state the action(s) of the - subscapularis (2)

Answer 3

1. internal rotation

2. contributes to humeral head stability in the glenoid cavity during humeral movement

Question 4

state the action(s) of the - biceps brachii 4)

Answer 4

1. forearm supination
2. elbow flexion
3. shoulder flexion
4. stabilises the glenohumeral joint both anteriorly and superiorly

Question 5

state the action(s) of the - infraspinatus (3)

Answer 5

1. works in combination with the teres minor
2. contributes to the stability of the humeral head
3. external rotation of the shoulder

Question 6

state the action(s) of the - teres minor (4)

Answer 6

1. works in combination with the infraspinatus
2. contributes to stability of the humeral head
3. external rotation of the shoulder
4. adduction at the shoulder

Question 7

state the action(s) of the - supraspinatus (2)

Answer 7

1. contributes to the stability of the humeral head

2. initiates abduction (with the medial deltoid)

Question 8

state the action(s) of the - latissimus dorsi (4)

Answer 8

1. shoulder extension
2. shoulder adduction
3. internal rotation
4. secures the inferior angle of the scapula against the chest wall

Question 9

state the action(s) of the - teres major (3)

Answer 9

1. extension
2. adduction
3. medial rotation

Question 10

state the action(s) of the - triceps brachii (3)

Answer 10

1. elbow extension
2. shoulder extension
3. stabilises the glenohumeral joint both posteriorly and inferiorly

Question 11

state the origin(s) of the - triceps brachii

Answer 11

LoH - infraglenoid tubercle of the scapula

LaH - upper 1/2 posterior surface of the shaft of the humorous

MH - lower 1/2 of the posterior surface of the shaft of the humorous

Question 12

state the origin(s) of the - teres major

Answer 12

dorsal aspect of the inferior angle of the scapula and the lateral border of the scapula

Question 13

state the origin(s) of the - latissimus dorsi

Answer 13

spinous processes of T7-S5; posterior surface of the iliac crest; lower 4 ribs; inferior angle of the scapula

Question 14

state the origin(s) of the - supraspinatus

Answer 14

supraspinous fossa of the scapula

Question 15

state the origin(s) of the - deltoids

Answer 15

A - anterior border of the lateral third of the clavicle

M/L - lateral border of the acromion

P - lower lip of the scapula spine

Question 16

state the origin(s) of the - teres minor

Answer 16

upper two thirds of the lateral border of the scapula

Question 17

state the origin(s) of the - infraspinatus

Answer 17

infraspinous fossa of the scapula

Question 18

state the origin(s) of the - biceps brachii

Answer 18

LH - supraglenoid tubercle of the scapula

SH - coracoid process of the scapula

Question 19

state the origin(s) of the - subscapularis

Answer 19

supraglenoid fossa of the scapula

Question 20

state the origin(s) of the - coracobrachialis

Answer 20

tip of the coracoid process (medial to bicep SH)

Question 21

state the origin(s) of the - pectoralis major

Answer 21

CF - anterior surface of the medial half of the clavicle

SF - anterior surface of the sternum; upper 6 costal cartilage

Question 22

state the insertion(s) of the - pectoralis major

Answer 22

bicipital / intertubercular groove (of humorous)

Question 23

state the insertion(s) of the - coracobrachialis

Answer 23

medial aspect of the medial shaft of the humorous

Question 24

state the insertion(s) of the - subscapularis

Answer 24

lesser tuberosity of the humorous; anterior part of the shoulder joint

Question 25

state the insertion(s) of the - biceps brachii

Answer 25

via bicep brachii tendon onto radial tuberosity

Question 26

state the insertion(s) of the - infraspinatus

Answer 26

middle facet of the greater tuberosity of the humorous; capsule of the shoulder joint

Question 27

state the insertion(s) of the - teres minor

Answer 27

greater tuberosity of the humorous; capsule of the shoulder joint

Question 28

state the insertion(s) of the - deltoid

Answer 28

v-shaped deltoid tuberosity on the lateral aspect of the shaft of the humorous

Question 29

state the insertion(s) of the - supraspinatus

Answer 29

upper facet of greater tuberosity of the humorous; shoulder joint capsule

Question 30

state the insertion(s) of the - latissimus dorsi

Answer 30

bicipital / intertubercular groove of the humorous

Question 31

state the insertion(s) of the - teres major

Answer 31

medial lip of the intertubercular groove

Question 32

state the insertion(s) of the - triceps brachii

Answer 32

olecranon process of ulna