OIA of Upper Extremity and Shoulder

Question 1

origin of pectoralis major

Answer 1

• sternal end of clavicle
• sternum
• cartilage of ribs 1-6/7
• aponeurosis of external oblique muscle

Question 2

insertion of pectoralis major

Answer 2

• crest of greater tubercle of humerus
• intertubercular sulcus

Question 3

origin of latissimus dorsi

Answer 3

• spines of lower 6 thoracic vertebrae
• lower 3-4 ribs
• iliac crest
• inferior angle of scapula

Question 4

insertion of latissimus dorsi

Answer 4

• intertubercular sulcus of humerus

Question 5

origin of teres major

Answer 5

• inferior angle of scapula posteriorly

Question 6

insertion of teres major

Answer 6

• intertubercular sulcus
• crest of lesser tubercle

Question 7

origin of trapezius

Answer 7

• occipital bone
• ligamentum nuchae
• spinous processes of C7 and all thoracic vertebrae

Question 8

insertion of trapezius

Answer 8

• continuous along acromion, spine of scapula and lateral 1/3 of clavicle

Question 9

origin of deltoid

Answer 9

• lateral 1/3 of clavicle
• acromion
• spine of scapula

Question 10

insertion of deltoid

Answer 10

• deltoid tuberosity

Question 11

what is the connection between the trapezius and deltoid?

Answer 11

the origin of the deltoid is the same as the insertion of the trapezius

Question 12

origin of the supraspinatus

Answer 12

supraspinatus fossa

Question 13

origin of infraspinatus

Answer 13

infraspinatus fossa

Question 14

origin of teres minor

Answer 14

lateral border of scapular surface (dorsal)

Question 15

origin of subscapularis

Answer 15

subscapular fossa

Question 16

insertion of teres minor

Answer 16

greater tubercle of humerus

Question 17

insertion of infraspinatus

Answer 17

greater tubercle of humerus

Question 18

insertion of supraspinatus

Answer 18

greater tubercle of humerus

Question 19

insertion of subscapularis

Answer 19

lesser tubercle of humerus

Question 20

what muscles share insertion at greater tubercle?

Answer 20

S = supraspinatus
I = infraspinatus
T = teres minor

Question 21

what muscles all orginate at their respective fossas?

Answer 21

supraspinatus, infraspinatus and subscapularis

Question 22

origin of serratus anterior

Answer 22

• series of muscles slips from ribs 1-8/9

Question 23

insertion of serratus anterior

Answer 23

• entire anterior surface of medial border of scapula

Question 24

origin of levator scapulae

Answer 24

• transverse processes of C1-C4

Question 25

insertion of levator scapulae

Answer 25

• medial border of scapula (superior to spine)

Question 26

origin of rhomboid major & minor

Answer 26

minor = spinous processes of C7 and T1
major = spinous processes of T2 to T5

Question 27

insertion of rhomboid major & minor

Answer 27

medial border of scapula

Question 28

origin of pectoralis minor

Answer 28

• anterior surface of ribs 3-5

Question 29

insertion of pectoralis minor

Answer 29

• coracoid process of scapula

Question 30

origin of coracobrachialis

Answer 30

• corcacoid process of scapula

Question 31

insertion of coracobrachialis

Answer 31

• medial surface of humerus

Question 32

origin of brachialis

Answer 32

• anterior surface of distal humerus

Question 33

insertion of brachialis

Answer 33

• coranoid process of ulna
• capsule of elbow joint

Question 34

origin of biceps brachii

Answer 34

short head = coracoid process
long head = supraglenoid tubercle

Question 35

insertion of biceps brachii

Answer 35

• radial tuberosity
• bicipital aponeurosis on medial forearm

Question 36

origin of triceps brachii

Answer 36

medial head = posterior humerus (superior to radial groove)
lateral head = posterior humerus (inferior to radial groove)
long head = infraglenoid tubercle

Question 37

insertion of tricep brachii

Answer 37

• proximal end of olecranon fossa of ulna