Pectoral and Anterior Shoulder/Arm

Question 1

Platysma Origin

Answer 1

fascia of the upper thorax and lower neck

Question 2

Platysma Insertion

Answer 2

mandible (along chin), skin of the face over the mandible (along chin), muscles of the lower lip and angle of mouth

Question 3

Platysma Action

Answer 3

Pulls on skin of neck (elevates) to give expression of “horror” or “fright”. Depression of lower lip and angle of mouth

Question 4

Platysma Innervation

Answer 4

facial nerve (Cranial Nerve VII)

Question 5

Platysma Blood supply

Answer 5

facial artery

Question 6

Sternocleidomastoid Origin

Answer 6

manubrium of sternum; medial 1/3 of clavicle

Question 7

Sternocleidomastoid Insertion

Answer 7

mastoid process of temporal bone

Question 8

Sternocleidomastoid Actions

Answer 8

rotates head and neck while elevating chin (one side working) flexes head and neck (both sides working)

Question 9

Sternocleidomastoid Innervation

Answer 9

accessory nerve (Cranial Nerve XI)

Question 10

Sternocleidomastoid Blood supply

Answer 10

occipital artery

Question 11

Pectoralis Major Origin

Answer 11

medial 2/3 of clavicle (clavicular portion), entire length of sternum (sternocostal portion), upper 6 costal cartilages
(sternocostal portion)

Question 12

Pectoralis Major Insertion

Answer 12

crest of greater tubercle of humerus

Question 13

Pectoralis Major Actions

Answer 13

flexion of humerus (clavicular portion only), extension of humerus (sternocostal portion only), adduction of humerus, medial
rotation of humerus

Question 14

Pectoralis Major Innervation

Answer 14

lateral pectoral nerve (clavicular portion), medial pectoral nerve (sternocostal portion)

Question 15

Pectoralis Major Blood supply

Answer 15

thoracoacromial artery

Question 16

Pectoralis Minor Origin

Answer 16

ribs 3, 4 and 5

Question 17

Pectoralis Minor Insertion

Answer 17

coracoid process of scapula

Question 18

Pectoralis Minor Actions

Answer 18

protraction of scapula, depression of scapula, downward rotation of scapula

Question 19

Pectoralis Minor Innervation

Answer 19

medial pectoral nerve

Question 20

Pectoralis Minor Blood supply

Answer 20

thoracoacromial artery

Question 21

Serratus Anterior Origin

Answer 21

anterolateral surface of ribs 1-8

Question 22

Serratus Anterior Insertion

Answer 22

medial border of scapula, inferior angle of scapula

Question 23

Serratus Anterior Action

Answer 23

protraction of scapula, upward rotation of scapula, depression of scapula

Question 24

Serratus Anterior Innervation

Answer 24

long thoracic nerve

Question 25

Serratus Anterior Blood supply

Answer 25

lateral thoracic artery

Question 26

Deltoid Origin

Answer 26

lateral 1/3 of clavicle, acromion process of scapula, spine of scapula

Question 27

Deltoid Insertion

Answer 27

deltoid tuberosity of humerus

Question 28

Deltoid Action

Answer 28

anterior fibers: flexion of humerus, medial rotation of humerus lateral fibers: abduction of humerus after first 5-10° posterior fibers: extension of humerus, lateral rotation of humerus

Question 29

Deltoid Innervation

Answer 29

Axillary n.

Question 30

Deltoid Blood supply

Answer 30

thoracoacromial trunk and anterior and posterior circumflex humeral aa.

Question 31

Biceps brachii Origin

Answer 31

coracoid process of scapula (short head); supraglenoid tubercle of scapula (long head)

Question 32

Biceps brachii Insertion

Answer 32

radial tuberosity of radius, bicipital aponeurosis

Question 33

Biceps brachii Action

Answer 33

forearm supination, forearm, and weak role shoulder flexion

Question 34

Biceps brachii Blood supply

Answer 34

brachial a.

Question 35

Coracobrachialis Origin

Answer 35

coracoid process of scapula

Question 36

Coracobrachialis Insertion

Answer 36

mid-medial surface of humerus

Question 37

Coracobrachialis Action

Answer 37

flexion of humerus, adduction of humerus

Question 38

Coracobrachialis Innervation

Answer 38

musculocutaneous n.

Question 39

Coracobrachialis Blood supply

Answer 39

brachial and anterior circumflex humeral a.

Question 40

Brachialis Origin

Answer 40

lower anterior surface of humerus

Question 41

Brachialis Insertion

Answer 41

ulnar tuberosity of ulna

Question 42

Brachialis Action

Answer 42

flex forearm

Question 43

Brachialis Innervation

Answer 43

musculocutaneous nerve

Question 44

Brachialis Blood supply

Answer 44

brachial a.