Exam 2: Shoulder Joint

Question 1

What are the 3 groups of the deltoid?

Answer 1

Anterior, Middle and Posterior

Question 2

What is the insertion of the all groups of the deltoid?

Answer 2

Deltoid tuberosity of humerus

Question 3

What is the origin of the anterior group of the deltoid?

Answer 3

Lateral 1/3 of clavicle

Question 4

What is the action of the anterior group of the deltoid?

Answer 4

Abduction, flexion, internal rotation, horizontal adduction

Question 5

What is the origin of the middle group of the deltoid?

Answer 5

Acromion process

Question 6

What is the action of the middle group of the deltoid?

Answer 6

Abduction, horizontal adduction

Question 7

What is the origin of the posterior group of the deltoid?

Answer 7

Spine of scapula

Question 8

What is the action of the posterior group of the deltoid?

Answer 8

Abduction, extension, external rotation, horizontal abduction

Question 9

What is the origin of the supraspinatus?

Answer 9

Medial 2/3rds supraspinous spinous process of scapula

Question 10

What is the insertion of the supraspinatus?

Answer 10

Greater tubercle of humerus

Question 11

What is the action of the supraspinatus?

Answer 11

Abduction and humeral head stabilization

Question 12

What is the origin of the coracobrachialis?

Answer 12

Coracoid process of scapula

Question 13

What is the insertion of the coracobrachialis?

Answer 13

Midway down humerus-anteromedial surface

Question 14

What is the action of the coracobrachialis?

Answer 14

Flexion, adduction and horizontal adduction

Question 15

What is the origin of the pectoralis major?

Answer 15

Medial half of clavicle, anterior portion of costal cartilages of ribs 1-6 and adjacent portion of sternum

Question 16

What is the insertion of the pectoralis major?

Answer 16

Lateral lip of intertubercular groove

Question 17

What is the action of the pectoralis major?

Answer 17

Upper fibers: internal rotation, horizontal adduction, flexion (up to 60 degrees), adduction (w/ arm below 90 degrees of abduction), abduction (above 90 degrees)
Lower fibers: internal rotation, horizontal adduction, adduction and extension

Question 18

What is the origin of the subscapularis?

Answer 18

Anterior surface of subscapular fossa of scapula

Question 19

What is the insertion of the subscapularis?

Answer 19

Lesser tubercle of humerus

Question 20

What is the action of the subscapularis?

Answer 20

Internal rotation, adduction, extension and stabilization

Question 21

What is the origin of the teres major?

Answer 21

Posterior lower 1/3 of axillary border of scapula

Question 22

What is the insertion of the teres major?

Answer 22

Medial lip of intertubercular groove

Question 23

What is the action of the teres major?

Answer 23

Internal rotation, adduction and extension

Question 24

What is the origin of the latissmus dorsi?

Answer 24

T7-L5, iliac crest and back of sacrum

Question 25

What is the insertion of the latissmus dorsi?

Answer 25

Medial lip of intertubercular groove

Question 26

What is the action of the latissmus dorsi?

Answer 26

Adduction, internal rotation, extension and horizontal abduction

Question 27

What is the origin of the infraspinatus?

Answer 27

Infraspinous fossa of scapula

Question 28

What is the insertion of the infraspinatus?

Answer 28

Greater tubercle of humerus

Question 29

What is the action of the infraspinatus?

Answer 29

External rotation, horizontal abduction, extension and stabilization

Question 30

What is the origin of the teres minor?

Answer 30

Upper 2/3rds of axillary border of scapula

Question 31

What is the insertion of the teres minor?

Answer 31

Greater tubercle of humerus

Question 32

What is the action of the teres minor?

Answer 32

External rotation, horizontal abduction, extension and stabilization

Question 33

What is the origin of the biceps brachii?

Answer 33

Long head: supraglenoid tubercle Shorts: coracoid process

Question 34

What is the insertion of the biceps brachii?

Answer 34

Radial tuberosity and bicipital aponeurosis

Question 35

What is the action of the biceps brachii?

Answer 35

Elbow flexion, supination of forearm, shoulder horizontal adduction, flexion and abduction

Question 36

What is the origin of the triceps brachii?

Answer 36

Long head: Infraglenoid tubercle of scapula Lateral head: Upper 1/2 of posterior humerus Medial head: Lower 2/3rds of posterior humerus

Question 37

What is the insertion of the triceps brachii?

Answer 37

Olecranon process

Question 38

What is the action of the triceps brachii?

Answer 38

Elbow extension, shoulder extension, adduction and horizontal abduction