Shoulder & Arm

Question 1

Origin and Insertion of Deltoid

Answer 1

Origin: lateral 1/3 of clavicle; acromion; spine of the scapula
Insertion: deltoid tuberosity

Question 2

Action of Deltoid All fibers

Answer 2

Abduct the shoulder

Question 3

Action of Deltoid Anterior Fibers

Answer 3

Flex the shoulder; medially rotate the shoulder; horizontally adduct the shoulder

Question 4

Actions of Deltoid Posterior Fibers

Answer 4

Extend the shoulder; laterally flex the shoulder; horizontally abduct the shoulder

Question 5

Origin and Insertion of Trapezius

Answer 5

Origin: external occipital protuberance; medial portion of superior nuchal line; ligamentum nuchae; spinous process of C7 to T12
Insertion: Lateral 1/3 of clavicle; acromion; spine of scapula

Question 6

Actions of Trapezius Upper Fibers

Answer 6

Bilaterally: extend the head and neck
Unilaterally: laterally flex the head and neck to same side; rotate head and neck to opposite side; elevate the scapula; upwardly rotate the scapula

Question 7

Actions of Trapezius Middle Fibers

Answer 7

Adduct the shoulder; stabilize the scapula

Question 8

Actions of Trapezius Lower Fibers

Answer 8

Depress the scapula; upwardly rotate the scapula

Question 9

Origin and Insertion of Lats

Answer 9

Origin: inferior angle of scapula, thoracolumbar fascia, last 3 or 4 ribs, spinous process of last 6 thoratic vertebrae; posterior iliac crest
Insertion: intertubercular groove of humerus

Question 10

Actions of Lats

Answer 10

Adduct the shoulder; extend the shoulder; medially rotate the shoulder

Question 11

Origin and Insertion of Teres Major

Answer 11

Origin: Inferior angle and lower 1/3 of lateral border of scap
Insertion: crest of lesser tubercle of humerus

Question 12

Actions of Teres Major

Answer 12

Extend; adduct and medially rotate the shoulder

Question 13

Origin and insertion of subscapularis

Answer 13

Origin: subscapular fossa
Insertion: greater tubercle of humerus

Question 14

Actions of subscapularis

Answer 14

stabilize the shoulder; abduct the shoulder

Question 15

Origin and insertion of infraspinatus

Answer 15

Origin: infraspinous fossa
Insertion: greater tubercle of humerus

Question 16

Actions of infraspinatus

Answer 16

stabilize the shoulder; adduct the shoulder; laterally rotate the shoulder

Question 17

Origin and Insertion of Teres Minor

Answer 17

Origin: upper 2/3 of lateral border of scap
Insertion: greater tubercle of humerus

Question 18

Actions of Teres Minor

Answer 18

Laterally rotate and adduct the shoulder; stabilize the shoulder

Question 19

Origin and insertion of subscapularis

Answer 19

Origin: subscapularis fossa
Insertion: lesser tubercle of humerus

Question 20

Origin and insertion of rhomboid major

Answer 20

Origin: spinous process T2 to T5
Insertion: medial border of scap between the spine of scap and inferior angle

Question 21

Action of rhomboid major

Answer 21

adduct, elevate scap, downwardly rotate scap

Question 22

Origin and insertion of rhomboid minor

Answer 22

Origin: spinous process of C7 to T1
Insertion: upper portion of the scap; acromion process; spine of the scap

Question 23

Action of rhomboid minor

Answer 23

adduct, elevate, and downwardly rotate the scap

Question 24

Origin and insertion of levator scap

Answer 24

Origin: TVPs of 1st through 4th cervical vertebrae
Insertion: medial border of scap between the superior angle and superior portion of spine of scap

Question 25

Actions of levator scap

Answer 25

Unilaterally: elevate and downwardly rotate the scap, laterally flex the head and neck; rotate the head and neck to same side
Bilaterally: extend the head and neck

Question 26

Origin and Insertion of serratus anterior

Answer 26

Origin: external surface of upper eight or nine ribs
Insertion: anterior surface of medial border of the scap

Question 27

Actions of serratus anterior

Answer 27

(with origin fixed): abduct, upwardly rotate, and depress the scap; hold the medial border of the scap against the ribs

Question 28

Origin and insertion of pec major

Answer 28

Origin: medial 1/2 of clavicle, sternum, and cartilage of 1st through 6th ribs
Insertion: crest of greater tubercle of humerus

Question 29

Actions of pec major

Answer 29

All fibers: adduct and medially rotate the shoulder
Upper fibers: flex and horizontally adduct the shoulder
Lower fibers: extend the shoulder

Question 30

Origin and Insertion of pec minor

Answer 30

Origin: 3rd, 4th and 5th ribs
Insertion: medial surface of coracoid process of the scap

Question 31

Action of pec minor

Answer 31

depress, abduct and downwardly rotate the scap

Question 32

Origin and insertion of subclavius

Answer 32

Origin: first rib and cartilage
Insertion: inferior surface of middle 1/3 of clavicle

Question 33

Actions of subclavius

Answer 33

depress the clavicle and draw it anteriorly; elevate the first rib; stabilize the sternoclavicular joint

Question 34

Origin and Insertion of biceps brachii

Answer 34

Origin: coracoid process and supraglenoid tubercle
Insertion: tuberosity of radius and aponeurosis of the biceps brachii

Question 35

Actions of biceps brachii

Answer 35

flex the elbow; flex the forearm and supinate the forearm

Question 36

Origin and Insertion of triceps brachii

Answer 36

Origin: infraglenoid tubercle, posterior surface of proximal 1/2 of humerus, posterior surface of distal 1/2 of humerus
Insertion: olecranon process of ulna

Question 37

Actions of triceps brachii

Answer 37

All Heads: extend the elbow
Long Head: extend and adduct the shoulder

Question 38

Origin and Insertion of coracobrachialis

Answer 38

Origin: coracoid process of scap
Insertion: medial surface of mid-humeral shaft

Question 39

Actions of coracobrachialis

Answer 39

flex and adduct the shoulder