OP Group 2

Question 1

Deltoid - Origin

Answer 1

Lateral 1/3 of clavicle, acromion and spine of scapula

Question 2

Deltoid - Insertion

Answer 2

Deltoid tuberosity of humerus

Question 3

Deltoid - Action

Answer 3

Abduction of shoulder (middle fibers), flexion and horizontal adduction (anterior fibers), extension and horizontal abduction (posterior fibers)

Question 4

Deltoid - Innervation

Answer 4

Axillary nerve

Question 5

Teres Minor - Origin

Answer 5

Superior lateral border of scapula

Question 6

Teres Minor - Insertion

Answer 6

Greater tubercle of humerus

Question 7

Teres Minor - Action

Answer 7

Lateral rotation of shoulder, stabilizes glenohumeral joint

Question 8

Teres Minor - Innervation

Answer 8

Axillary nerve

Question 9

Biceps Brachii - Origin

Answer 9

Long head: supraglenoid tubercle and glenohumeral labrum; Short head: coracoid process of scapula

Question 10

Biceps Brachii - Insertion

Answer 10

Radial tuberosity and bicipital aponeurosis

Question 11

Biceps Brachii - Action

Answer 11

Flexion and supination of elbow, flexion of shoulder

Question 12

Biceps Brachii - Innervation

Answer 12

Musculocutaneous nerve

Question 13

Supraspinatus - Origin

Answer 13

Supraspinous fossa of scapula

Question 14

Supraspinatus - Insertion

Answer 14

Greater tubercle of humerus

Question 15

Supraspinatus - Action

Answer 15

Abduction of shoulder, stabilizes glenohumeral joint

Question 16

Supraspinatus - Innervation

Answer 16

Suprascapular nerve

Question 17

Subscapularis - Origin

Answer 17

Subscapular fossa of scapula

Question 18

Subscapularis - Insertion

Answer 18

Lesser tubercle of humerus

Question 19

Subscapularis - Action

Answer 19

Medial rotation of shoulder, stabilizes glenohumeral joint

Question 20

Subscapularis - Innervation

Answer 20

Upper and lower subscapular nerves

Question 21

Infraspinatus - Origin

Answer 21

Infraspinous fossa, inferior portion of spine of scapula

Question 22

Infraspinatus - Insertion

Answer 22

Greater tubercle of humerus

Question 23

Infraspinatus - Action

Answer 23

Lateral rotation of shoulder, stabilizes glenohumeral joint

Question 24

Infraspinatus - Innervation

Answer 24

Suprascapular nerve

Question 25

Teres Major - Origin

Answer 25

Inferior, lateral border of scapula

Question 26

Teres Major - Insertion

Answer 26

Medial lip of bicipital groove of humerus

Question 27

Teres Major - Action

Answer 27

Medial rotation and adduction of shoulder

Question 28

Teres Major - Innervation

Answer 28

Lower subscapular nerve

Question 29

Pectoralis Major - Origin

Answer 29

Clavicular fibers: medial ½ of clavicle; Sternal fibers: anterior sternum; Costal fibers: costal cartilage of ribs 1-7

Question 30

Pectoralis Major - Insertion

Answer 30

Lateral lip of bicipital groove of humerus

Question 31

Pectoralis Major - Action

Answer 31

Adduction and medial rotation of shoulder, horizontal adduction of shoulder

Question 32

Pectoralis Major - Innervation

Answer 32

Medial and lateral pectoral nerves

Question 33

What is the origin of the Brachialis muscle?

Answer 33

Anterior distal ½ of humerus

Question 34

What is the insertion point of the Brachialis muscle?

Answer 34

Ulnar tuberosity and coronoid process of ulna

Question 35

What is the primary action of the Brachialis muscle?

Answer 35

Flexion of elbow (main elbow flexor)

Question 36

What nerves innervate the Brachialis muscle?

Answer 36

Musculocutaneous and radial nerve

Question 37

What is the origin of the long head of the Triceps Brachii?

Answer 37

Infraglenoid tubercle and neck of scapula

Question 38

What is the origin of the lateral head of the Triceps Brachii?

Answer 38

Upper half of posterior surface of shaft of humerus (above radial groove)

Question 39

What is the origin of the deep (medial) head of the Triceps Brachii?

Answer 39

Posterior shaft of humerus (below radial groove)

Question 40

What is the insertion point of the Triceps Brachii?

Answer 40

Olecranon process

Question 41

What is the primary action of the Triceps Brachii?

Answer 41

Extension of elbow

Question 42

What is the innervation of the Triceps Brachii?

Answer 42

Radial nerve (axillary nerve - long head)