UE Myology

Question 1

What are the thoracioappendicular muscles?

Answer 1

1. Pectoralis Major m. 2. Pectoralis Minor m. 3. Subclavius m. 4. Serratus Anterior m.

Question 2

What is the action of the pectoralis major m. ?

Answer 2

ADduct and medially rotate the humerus

Question 3

Where does the pectoralis major muscle insert onto?

Answer 3

The lateral edge of the intertubercular groove of the humerus

Question 4

What is the action of the pectoralis minor m. ?

Answer 4

Stabilizes the scapula

Question 5

What is the action of the serratus anterior m.?

Answer 5

Protracts the scapula, stabilizes the scapula, rotates the glenoid cavity superiorly

Question 6

Injury to the Long Thoracic N. results in what?

Answer 6

Paralysis of the Serratus Anterior m.

Question 7

What does paralysis of the serratus anterior muscle cause?

Answer 7

“winging” of the scapula away from the thoracic wall, which makes abducting the upper limb beyond the horizontal position difficult

Question 8

What is the action of the anterior part of the deltoid muscle?

Answer 8

flex and medially rotate the humerus

Question 9

What is the action of the middle part of the deltoid m.?

Answer 9

ABduct the humerus

Question 10

What is the action of the posterior part of the deltoid m.?

Answer 10

Extend and laterally rotate the humerus

Question 11

Where does the subscapularis muscle insert onto?

Answer 11

the lesser tubercle of the humerus (anterior aspect)

Question 12

What is the action of the subscapularis muscle?

Answer 12

Medially rotate and ADduct the humerus

Question 13

Where does the supraspinatus muscle insert onto?

Answer 13

The greater tubercle of the humerus (posterior aspect)

Question 14

What is the action of the supraspinatus muscle?

Answer 14

ABduct the humerus

Question 15

Where does the infraspinatus muscle insert onto?

Answer 15

the greater tubercle of the humerus (posterior aspect)

Question 16

What is the action of the infraspinatus muscle?

Answer 16

laterally rotate the humerus

Question 17

Where does the teres minor muscle insert onto?

Answer 17

the greater tubercle of the humerus (posterior aspect)

Question 18

What is the action of the teres minor muscle?

Answer 18

Laterally rotates the humerus

Question 19

What are the muscles involved in the rotator cuff?

Answer 19

The supraspinatus, the infraspinatus, teres minor, and subscapularis muscle.

Question 20

What is the primary action of the muscles involved in the rotator cuff?

Answer 20

to hold the humeral head in the glenoid cavity

Question 21

Where does the teres major muscle insert onto?

Answer 21

The medial edge of the intertubercular groove of the humerus (anterior aspect)

Question 22

What is the action of the teres major muscle?

Answer 22

ADduct and medially rotate the humerus

Question 23

What muscle is the most commonly injured in the rotator cuff?

Answer 23

The supraspinatus muscle

Question 24

Where is the origin for the long head of the biceps brachii muscle?

Answer 24

Supraglenoid tubercle of the scapula

Question 25

Where is the origin for the short head of the biceps brachii muscle?

Answer 25

The coracoid process of the scapula

Question 26

Where is the insertion for the biceps brachii muscle?

Answer 26

the radial tuberosity and the antebrachial fascia as the bicipital aponeurosis

Question 27

What is the action of the biceps brachii muscle?

Answer 27

flex the humerus, flex the forearm, and supinate the forearm

Question 28

What is the action of the coracobrachialis muscle?

Answer 28

flex and adduct the humerus

Question 29

Where is the insertion for the brachialis muscle?

Answer 29

ulnar tuberosity and coronoid process

Question 30

What is the action of the brachialis muscle?

Answer 30

Flex the forearm

Question 31

What are the anterior compartment brachial muscles?

Answer 31

Biceps brachii muscle, coracobrachialis muscle, and brachialis muscle

Question 32

What are the posterior compartment brachial muscles?

Answer 32

Triceps brachii muscle and anconeus muscle

Question 33

Where does the long head of the triceps brachii muscle originate from?

Answer 33

the infraglenoid tubercle of the scapula

Question 34

Where does the lateral head of the triceps brachii muscle originate from?

Answer 34

the posterior aspect of the humeral body-lateral side

Question 35

Where does the medial head of the triceps brachii muscle originate from?

Answer 35

posterior aspect of the humeral body-more medial side

Question 36

Where does the triceps brachii muscle insert?

Answer 36

the olecranon of the ulna and antebrachial fossa

Question 37

What is the action of the triceps brachii muscle?

Answer 37

Extend the forearm

Question 38

What is the origin of the anconeus muscle?

Answer 38

lateral humeral epicondyle

Question 39

Where does the anconeus muscle insert?

Answer 39

Lateral aspect of the olecranon

Question 40

What is the action of the anconeus muscle?

Answer 40

Extends the forearm

Question 41

What are the scapulohumeral muscles?

Answer 41

1. Deltoid Muscle 2. subscapularis muscle 3. Supraspinatus muscle 4. Infraspinatus muscle

Question 42

What muscles are in the superficial layer of flexors in the forearm?

Answer 42

1. Pronator Teres muscle 2. flexor carpi radialis muscle 3. palmaris longus muscle 4. flexor carpi ulnaris muscle

Question 43

What is the action of the pronator teres muscle?

Answer 43

pronate and flex the forearm

Question 44

What is the action of the flexor carpi radialis muscle?

Answer 44

flex forearm, flex and ABduct hand at the wrist

Question 45

What is the action of the flexor carpi ulnaris muscle?

Answer 45

flex forearm, flex and ADduct the hand at the wrist

Question 46

What is the muscle in the intermediate layer of flexors of the forearm?

Answer 46

Flexor digitorum superficialis muscle

Question 47

What are the muscles in the deep layer of flexors in the forearm?

Answer 47

Flexor digitorum profundus muscle, flexor pollicis longus muscle, pronator quadratus muscle

Question 48

Where does the pectoralis minor insert into?

Answer 48

Coracoid process of the scapula