Muscles acting on Shoulder

Question 1

Origin of Pectoralis Major

Answer 1

Medial Clavicle & Sternum

Question 2

Insertion of Pectoralis Major

Answer 2

Humerus

Question 3

Action of Pectoralis Major at Shoulder

Answer 3

Flexion, Adduction, Medial Rotation at the shoulder

Question 4

Origin of Latissimus Dorsi

Answer 4

Thoracic & Lumber vertebra, Sacrum, Illiac crest

Question 5

Insertion of Latissimus Dorsi

Answer 5

Anterior Humerus

Question 6

Origin of Coracobrachialis

Answer 6

Coracoid process

Question 7

Insertion of Coracobrachialis

Answer 7

Humerus

Question 8

Action of Coracobrachialis

Answer 8

Flexion at the shoulder

Question 9

Origin of Subscapularis

Answer 9

Subscapular Fossa

Question 10

Insertion of Subscapularis

Answer 10

Humerus

Question 11

Action of Subscapularis

Answer 11

Medial Rotation at the shoulder

Question 12

Origin of Supraspinatus

Answer 12

Supraspinous Fossa

Question 13

Insertion of Supraspinatus

Answer 13

Humerus

Question 14

Action of Supraspinatus

Answer 14

Abduction at the shoulder

Question 15

Origin of Infraspinatus

Answer 15

Infraspinous Fossa

Question 16

Insertion of Infraspinatus

Answer 16

Humerus

Question 17

Action of Infraspinatus

Answer 17

Lateral Rotation at the shoulder

Question 18

Origin of Teres Minor

Answer 18

Axillary Border of Scapula

Question 19

Insertion of Teres Minor

Answer 19

Humerus

Question 20

Action of Teres Minor

Answer 20

Lateral Rotation at the shoulder

Question 21

Action of Teres Major

Answer 21

Extension, Adduction, and Medial rotation at the shoulder

Question 22

Origin of Deltoid

Answer 22

Lateral Clavicle (anterior), Acromion (middle), Spine of Scapula (posterior)

Question 23

Insertion of Deltoid

Answer 23

Deltoid Tuberosity

Question 24

Action of Deltiod

Answer 24

Abduction
Anterior: flexion & medial rotation
Posterior: extension & lateral rotation

Question 25

Origin of Triceps Brachii

Answer 25

Long head: Scapula
Medial head: Medial Humerus
Lateral head: Lateral Humerus

Question 26

Insertions of Triceps Brachii

Answer 26

Olecranon Process

Question 27

Action of Triceps Brachii

Answer 27

Extension of Elbow
Long head extension of shoulder

Question 28

Origin of Biceps Brachii

Answer 28

Long head: Scapula
Short head: Coracoid Process

Question 29

Insertion of Biceps Brachii

Answer 29

Radial Tuberosity

Question 30

Action of Biceps Brachii

Answer 30

Flexion of Shoulder
Flexion of Elbow