Anatomy Exam 2

Question 1

thoracoscapular muscles

Answer 1

rhomboid major, rhomboid minor, trapezius muscle, levator scapulae, pectoralis minor, serratus anterior

Question 2

serratus anterior attachments

Answer 2

origin: most ribs
insert: vertebral border of scapula; sandwiched between scapula and thorax

Question 3

serratus anterior functions

Answer 3

protraction of scapula and upward rotation of scapula

Question 4

thoracohumeral muscles

Answer 4

latissimus dorsi and pectoralis major

Question 5

scapulohumeral muscles

Answer 5

teres minor, infraspinatus, supraspinatus, subscapularis, deltoid

Question 6

rotator cuff components (4)

Answer 6

SITS: subscapularis, infraspinatus, supraspinatus, teres minor

Question 7

rotator cuff attachments

Answer 7

originates: respective scapular fossae; insertions: proximal humerus, “peri-articular” area

Question 8

rotator cuff actions

Answer 8

muscles pull head of humerus closer to glenoid; stabilize head on glenoid; small adjustory movements of humeral head on glenoid; rotational movements of humeral head

Question 9

scapulohumeral muscles

Answer 9

teres major (inserts on front of humerus); deltoid

Question 10

teres major attachments

Answer 10

origin: lateral border of scapula
insertions: intertubercular sulcus of anterior humerus (with lats and pec major)

Question 11

teres major functions

Answer 11

same as latissimus dorsi; adduction of humerus; extension of humerus; medial rotation of humerus

Question 12

deltoid divisions

Answer 12

anterior head; middle head; posterior head; innervated by different branches of axillary nerve

Question 13

deltoid attachments

Answer 13

origins: distal clavical, acromion process, lateral scapular spine
insertion: humeral midshaft
big dog muscle