Muscles of Shoulder and Arm

Question 0

Pectoralis minor

Answer 0

P: ribs 3-5
D: scapula

Actions on scapula:
Stabilize scapula

Question 1

Pectoralis major

Answer 1

P: clavicle / sternum
D: humerus (inter tubercular sulcus)

Actions on humerus:
Adduction at shoulder
Medial rotation at shoulder
Flexion at shoulder

Question 2

Serratus anterior

Answer 2

P: ribs 1-8
D: scapula

Actions on scapula:
Holds scapula to thoracic wall
(Especially active during pushing)

Question 3

Subclavius

Answer 3

P: 1st rib
D: clavicle

Actions on clavicle:
Stabilize/depress clavicle

Question 4

Trapezius

Answer 4

P: Skull, nuchall ligament, C7-T12
D: scapula & clavicle

Actions on pectoral girdle:
Elevation
Retraction
Depression

Question 5

Latissimus dorsi

Answer 5

P: T7 - sacrum, ilium, ribs
D: humerus (intertubercular sulcus)

Actions on humerus:
Extension at shoulder
Adduction at shoulder
Medial rotation at shoulder

Question 6

Rhomboid major

Answer 6

P: T2-T5
D: medial border of scapula

Actions on scapula / girdle:
Retraction

Question 7

Rhomboid minor

Answer 7

P: C7-T1
D: scapula (medial border at spine)

Actions on scapula / girdle:
Retraction

Question 8

Levatator scapulae

Answer 8

P: C1-C4
D: scapula superior to spine

Actions on scapula / girdle:
Elevation

Question 9

Deltoid

Answer 9

P: scapula / clavicle
D: humerus (deltoid tuberosity)

Actions on humerus:
Adduction
Medial rotation

Question 10

Teres major

Answer 10

P: scapula
D: humerus (intertubercular sulcus)

Actions on humerus:
Adduction & medial rotation

Question 11

Supraspinatus

Answer 11

P: scapula
D: humerus (greater tubercle)

Action on humerus:
Initiate adduction 15 degrees

Question 12

Infraspinatus

Answer 12

P: scapula
D: humerus (greater tubercle)

Action on humerus:
Lateral rotation

Question 13

Teres minor

Answer 13

P: scapula
D: humerus (greater tubercle)

Action on humerus:
Lateral rotation

Question 14

Subscapularis

Answer 14

P: scapula (subscapular fossa)
D: humerus (lesser tubercle)

Action on humerus:
Medial rotation

Question 15

Triceps brachii (long head)

Answer 15

P: scapula
D: ulna (olecranon process)

Action on ulna:
Extension at elbow

Question 16

Triceps brachii (lateral head)

Answer 16

P: humerus
D: ulna (olecranon process)

Action on ulna:
Extension at elbow

Question 17

Triceps brachii (medial head)

Answer 17

P: humerus
D: ulna (olecranon process)

Action on ulna:
Extension at elbow

Question 18

Biceps brachii (long head)

Answer 18

P: scapula
D: radius (radial tuberosity)

Action on radius:
Supination of forearm
Flexion at elbow

Question 19

Biceps brachii (short head)

Answer 19

P: scapula (coracoid process)
D: radius (radial tuberosity)

Action on radius:
Supination of forearm
Flexion at elbow

Question 20

Coracobrachialis

Answer 20

P: scapula (coracoid process)
D: humerus (middle third)

Actions on humerus:
Flexion at shoulder
Reinforce shoulder anteriorly

Question 21

Brachialis

Answer 21

P: humerus (distal half)
D: ulna (coranoid process)

Action on ulna:
Primary flexor at elbow