Muscles Of The Arm

Question 1

Trapezius *

Answer 1

Origin: posterior occipital bone
Insertion: clavicle
Action: extends and abducts head

Question 2

Deltoid *

Answer 2

Origin: clavicle
Insertion: deltoid tuberosity of the humerus

Action: abducts arm; flexes, extends, medically and laterally rotates the arm

Question 3

Pectoralis major *

Answer 3

Origin: clavicle
Insertion: crest of greater tubercle of humerus

Action: flexes, abducts and medially rotates arm

Question 4

Pectoralis minor

Answer 4

Action: depresses Glenoid cavity
Synergist: pectoralis major

Question 5

Latissimus dorsi *

Answer 5

Origin: crest of ilium
Insertion: intertubercular groove of humerus

Action: extends, abducts and medially rotates the arm, draws shoulder inferiorly

Question 6

Supraspinatus

Answer 6

Action: abducts arm

Question 7

Infraspinatus

Answer 7

Action: laterally rotates arm

Question 8

Subscapularis

Answer 8

Action: medically rotates arm

Question 9

Teres minor

Answer 9

Action: laterally rotates and abducts arm

Question 10

Teres major

Answer 10

Action: extends, abducts, and medically rotates arm

Question 11

Biceps brachii *

Answer 11

Origin:

1. Superior margin of glenoid fossa
2. Coracoid process of scapula

Insertion: radial tuberosity
Actions: flexes arm and forearm, supinates hand

Question 12

Triceps brachii *

Answer 12

Origin: infraglenoid tuberosity of scapula

Insertion: tuberosity of ulna
Actions: extends and abducts arm and extends forearm

Question 13

Coracobrachialis

Answer 13

Action: flexes and abducts arm

Question 14

Brachialis

Answer 14

Action: flexes forearm

Question 15

Brachioradialis

Answer 15

Action: flexes forearm

Question 16

Supinator*

Answer 16

Origin: lateral epicondyle of humerus

Insertion: proximal radius
Action: supinate hand

Question 17

Pronator teres *

Answer 17

Origin: medial eoicondyle of humerus

Insertion: lateral, middle shaft of radius
Action: probate hand, flex forearm

Question 18

Pronator quadratus

Answer 18

Action: pronates hand

Question 19

Flexor Capri radialis

Answer 19

Action: flexes and abducts hand

Question 20

Palmaris longus *

Answer 20

Origin: medial epicondyle of humerus

Insertion: palmar aponeurosis
Action: flexes hand

Question 21

Flexor carpi ulnaris

Answer 21

Action: flexes and abducts hand

Question 22

Flexor digitorm superficialis *

Answer 22

Origin: medial epicondyle of humerus

Insertion: middle phalanges 2-5
Action: flexes hand and proximal and middle phalanges

Question 23

Flexor digitorm profundas

Answer 23

Action: flexes hand and phalanges

Question 24

Flexor pollicis longus

Answer 24

Action: flexes thumb

Question 25

Extensor carpi ulnaris

Answer 25

Action: extends and abducts hand

Question 26

Extensor digiti minimi

Answer 26

Action: extends the wrist

Question 27

Extensor carpi radialis longus

Answer 27

Action: extends and abducts hand

Question 28

Extensor carpi radialis brevis

Answer 28

Action: extends and abducts hand

Question 29

Extensor digitorum *

Answer 29

Origin: lateral epicondyle of humerus

Insertion: middle and distal phalanges 2-5
Action: extends phalanges and hand

Question 30

Extensor pollicis longus

Answer 30

Action: extends thumb

Question 31

Extensor pollicis brevis

Answer 31

Action: extends thumb

Question 32

Abductor pollicis longus

Answer 32

Action: abducts thumb

Question 33

Extensor indicis

Answer 33

Action: extends 2nd digit

Question 34

Flexor digiti minimi brevis

Answer 34

Action: flexes 5th digit

Question 35

Abductor digiti minimi

Answer 35

Action: abducts 5th digit

Question 36

Flexor pollicis brevis

Answer 36

Action: flexes thumb

Question 37

Abductor pollicis brevis

Answer 37

Action: abducts thumb

Question 38

Opponens pollicis *

Answer 38

Origin: trapezium
Insertion: 1st metacarpal
Action: opposes thumb

Question 39

Opponens digiti minimi

Answer 39

Action: opposes 5th digit