Brachium Muscles

Question 1

Subclavius Action

Answer 1

depresses and anchors clavicle

Question 2

Subclavius PA

Answer 2

junction of 1st rib and its costal cartilage

Question 3

Subclavius DA

Answer 3

inferior surface of middle surface of clavicle

Question 4

Subclavius Innervation

Answer 4

nerve to subclavius (C5, C6)

Question 5

Anterior Scalene Action

Answer 5

flex neck laterally
elevate 1st rib during forced inhalation

Question 6

Anterior Scalene SA

Answer 6

TP C3-C6

Question 7

Anterior Scalene IA

Answer 7

1st rib

Question 8

Anterior Scalene Innervation

Answer 8

cervical spinal nerve C4-C6

Question 9

Middle Scalene Action

Answer 9

flex neck laterally
elevate 1st rib during forced inhalation

Question 10

Middle Scalene SA

Answer 10

TP C5-C7

Question 11

Middle Scalene IA

Answer 11

1st rib

Question 12

Middle Scalene Innervation

Answer 12

anterior (ventral) rami of cervical spinal nerves

Question 13

Posterior Scalene Action

Answer 13

flex neck laterally
elevate 2nd rib during forced inhalation

Question 14

Posterior Scalene SA

Answer 14

TP C5-C7 (posterior tubercles)

Question 15

Posterior Scalene IA

Answer 15

2nd rib

Question 16

Posterior Scalene Innervation

Answer 16

anterior (ventral) rami of cervical spinal nerves C7 and C8

Question 17

Biceps Brachii Action

Answer 17

supinate forearm
flex forearm
short head: resists dislocation of shoulder

Question 18

Biceps Brachii PA

Answer 18

• short head: coracoid process
• long head: supraglenoid tubercle, labrum

Question 19

Biceps Brachii DA

Answer 19

radial tuberosity, fascia of forearm via bicipital aponeurosis

Question 20

Biceps Brachii Innervation

Answer 20

musculocutaneous nerve (C5, C6, C7)

Question 21

Coracobrachialis Action

Answer 21

flex shoulder (GH joint)
adduct shoulder (GH joint)
resists dislocation of shoulder

Question 22

Coracobrachialis PA

Answer 22

coracoid process

Question 23

Coracobrachialis DA

Answer 23

middle humerus

Question 24

Coracobrachialis Innervation

Answer 24

musculocutaneous nerve (C5, C6, C7)

Question 25

Brachialis Action

Answer 25

flex elbow in all positions (humerolnar joint)

Question 26

Brachialis PA

Answer 26

distal anterior humerus

Question 27

Brachialis DA

Answer 27

ulnar tuberosity, coronoid process of ulna

Question 28

Brachialis Innervation

Answer 28

musculocutaneous nerve (C5, C6), small branch from radial (C5, C7)

Question 29

Brachioradialis Action

Answer 29

- flex elbow (humerolnar joint) in midpronated position - assists to pronate and supinate forearm when these movements are resisted/from end range (humeroradial joint)

Question 30

Brachioradialis PA

Answer 30

lateral supracondylar ridge of humerus

Question 31

Brachioradialis DA

Answer 31

distal lateral radius (proximal to styloid process)

Question 32

Brachioradialis Innervation

Answer 32

radial nerve (C5, C6, C7)

Question 33

Triceps Brachii Action

Answer 33

chief extensor of forearm/elbow long head: resists dislocation of humerus (especially important during adduction)

Question 34

Triceps Brachii PA

Answer 34

- long head: infraglenoid tubercle - lateral head: posterior humerus, superior (lateral) to radial groove - medial head: posterior humerus, inferior (medial) to radial groove

Question 35

Triceps Brachii DA

Answer 35

olecranon of ulna

Question 36

Triceps Brachii Innervation

Answer 36

radial nerve (C6, C7, C8)