Anterior Shoulder - Axilla and Arm Muscles

Question 1

Pectoralis Major- Clavicular Head Origin

Answer 1

Anterior surface of medial half of clavicle

Question 2

Pectoralis Major- Clavicular Head Insertion

Answer 2

Lateral lip intertubercular sulcus of humerus

Question 3

Pectoralis Major- Clavicular Head Innervation

Answer 3

Lateral and medial pectoral nerves; clavicular head (C5,C6), sternocostal head (C7,C8,T1)

Question 4

Pectoralis Major- Clavicular Head Action

Answer 4

Both heads adducts and medially rotates humerus; draws scapula anteriorly and inferiorly. Clavicular head flexes humerus

Question 5

Pectoralis Major- Sternocostal Head Origin

Answer 5

Anterior surface of sternum, superior six costal cartilages, aponeurosis of external oblique muscle

Question 6

Pectoralis Major- Sternocostal Head Insertion

Answer 6

Lateral lip intertubercular sulcus of humerus

Question 7

Pectoralis Major- Sternocostal Head Innervation

Answer 7

Lateral and medial pectoral nerves; clavicular head (C5,C6), sternocostal head (C7,C8,T1)

Question 8

Pectoralis Major- Sternocostal Head Action

Answer 8

Both heads adducts and medially rotates humerus; draws scapula anteriorly and inferiorly. Sternocostal head extends it from the flexed position

Question 9

Serratus Anterior Origin

Answer 9

External surfaces of lateral parts of 1st-8th ribs

Question 10

Serratus Anterior Insertion

Answer 10

Anterior surface of medial border of scapula

Question 11

Serratus Anterior Innervation

Answer 11

Long thoracic nerve

Question 12

Serratus Anterior Action

Answer 12

Protracts scapula and holds it against thoracic wall; rotates scapula

Question 13

Serratus Anterior Root

Answer 13

C5,C6,C7

Question 14

Subclavius Origin

Answer 14

Junction of 1st rib and its costal cartilage

Question 15

Subclavius Insertion

Answer 15

Inferior surface of middle third of clavicle

Question 16

Subclavius Innervation

Answer 16

Nerve to subclavius (C5,C6)

Question 17

Subclavius Root

Answer 17

C5,C6

Question 18

Coracobrachialis Origin

Answer 18

Tip of coracoid process of scapula

Question 19

Coracobrachialis Insertion

Answer 19

Middle third of medial surface of humerus

Question 20

Coracobrachialis Innervation

Answer 20

Musculocutaneous nerve (C5,C6,C7)

Question 21

Coracobrachialis Action

Answer 21

Helps flex and adduct arm; resists dislocation of shoulder

Question 22

Biceps Brachii - Short Head Origin

Answer 22

Tip of coracoid process of scapula

Question 23

Biceps Brachii - Short Head Insertion

Answer 23

Tuberosity of radius and fascia of forearm via bicipital aponeurosis

Question 24

Biceps Brachii - Short Head Innervation

Answer 24

Musculocutaneous nerve (C5,C6,C7)

Question 25

Biceps Brachii - Short Head Action

Answer 25

Supinates forearm and, when it is supinated, flexes elbow, short head resists dislocation of shoulder

Question 26

Biceps Brachii - Long Head Origin

Answer 26

Supraglenoid tubercle of scapula

Question 27

Biceps Brachii - Long Head Insertion

Answer 27

Tuberosity of radius and fascia of forearm via bicipital aponeurosis

Question 28

Biceps Brachii - Long Head Innervation

Answer 28

Musculocutaneous nerve (C5,C6,C7)

Question 29

Biceps Brachii - Long Head Action

Answer 29

Supinates forearm and, when it is supinated, flexes elbow

Question 30

Brachialis Origin

Answer 30

Distal half of anterior surface of humerus

Question 31

Brachialis Insertion

Answer 31

Coronoid process and tuberosity ulna

Question 32

Brachialis Innervation

Answer 32

Musculocutaneous nerve (C5,C6) and radial nerve(C5,C7)

Question 33

Brachialis Action

Answer 33

Flexes forearm in all positions

Question 34

Triceps Brachii - Long Head Origin

Answer 34

Infraglenoid tubercle of scapula

Question 35

Triceps Brachii - Long Head Insertion

Answer 35

Proximal end of olecranon of ulna and fascia of forearm

Question 36

Triceps Brachii - Long Head Innervation

Answer 36

Radial nerve (C6,C7,C8)

Question 37

Triceps Brachii - Long Head Action

Answer 37

Chief extensor of forearm; long head resists dislocation of humerus; especially important during adduction

Question 38

Triceps Brachii - Lateral Head Origin

Answer 38

Posterior surface of humerus, superior to radial groove

Question 39

Triceps Brachii - Lateral Head Insertion

Answer 39

Proximal end of olecranon of ulna and fascia of forearm

Question 40

Triceps Brachii - Lateral Head Innervation

Answer 40

Radial nerve (C6,C7,C8)

Question 41

Triceps Brachii - Lateral Head Action

Answer 41

Chief extensor of forearm; long head resists dislocation of humerus; especially important during adduction

Question 42

Triceps Brachii - Medial Head Origin

Answer 42

Posterior surface of humerus, inferior to radial groove

Question 43

Triceps Brachii - Medial Head Insertion

Answer 43

Proximal end of olecranon of ulna and fascia of forearm

Question 44

Triceps Brachii - Medial Head Innervation

Answer 44

Radial nerve (C6,C7,C8)

Question 45

Triceps Brachii - Medial Head Action

Answer 45

Chief extensor of forearm; long head resists dislocation of humerus; especially important during adduction

Question 46

Anconeus Origin

Answer 46

Lateral epicondyle of humerus

Question 47

Anconeus Insertion

Answer 47

Lateral surface of olecranon and superior part of posterior surface of ulna

Question 48

Anconeus Innervation

Answer 48

Radial nerve (C7,C8,T1)

Question 49

Anconeus Action

Answer 49

Assists triceps in extending forearm; stabilizes elbow joint; may abduct ulna during pronation

Question 50

costoclavicular impression is at what end of clavicle

Answer 50

sternal

Question 51

humeral condyle is made up by blank and blank

Answer 51

capitulum, trochlea

Question 52

capitulum is blank

Answer 52

lateral

Question 53

trochlea is blank

Answer 53

medial

Question 54

radial fossa is blank

Answer 54

lateral

Question 55

coronoid fossa is blank

Answer 55

medial

Question 56

axillary artery becomes blank artery

Answer 56

brachial

Question 57

terminal branches of brachial plexus are all blank innervation

Answer 57

cutaneous

Question 58

Pectoralis minor origin

Answer 58

3-5 ribs near costal cartilages

Question 59

Pectoralis minor insertion

Answer 59

Medial and superior surface of coracoid process

Question 60

Pectoralis minor innervation

Answer 60

Medial pectoral nerve (C8, T1)

Question 61

Pectoralis minor action

Answer 61

Stabilize scapula by drawing it inferiorly and anteriorly on thoracic wall

Question 62

Subclavius action

Answer 62

Anchors and depresses clavicle