Shoulder, Arm, Brachial Plexus

Question 1

Supraspinatus Origin

Answer 1

supraspinous fossa of scapula

Question 2

Supraspinatus Insertion

Answer 2

greater tubercle of humerus

Question 3

Supraspinatus Action

Answer 3

abduction of humerus, first 0-10o

Question 4

Supraspinatus Innervation

Answer 4

suprascapular n.

Question 5

Supraspinatus Blood supply

Answer 5

suprascapular a.

Question 6

Infraspinatus Origin

Answer 6

infraspinous fossa of scapula

Question 7

Infraspinatus Insertion

Answer 7

greater tubercle of humerus (just posterior to supraspinatus)

Question 8

Infraspinatus Action

Answer 8

lateral rotation of humerus

Question 9

Infraspinatus Innervation

Answer 9

suprascapular n.

Question 10

Infraspinatus Blood supply

Answer 10

suprascapular a and circumflex scapular a.

Question 11

Teres Minor Origin

Answer 11

upper 2/3 of lateral (axillary) border of scapula

Question 12

Teres Minor Insertion

Answer 12

greater tubercle of humerus (posterior and inferior to infraspinatus)

Question 13

Teres Minor Action

Answer 13

lateral rotation of humerus

Question 14

Teres Minor Innervation

Answer 14

axillary n.

Question 15

Teres Minor Blood supply

Answer 15

subscapular a and circumflex scapular a.

Question 16

Subscapularis Origin

Answer 16

subscapular fossa of scapula

Question 17

Subscapularis Insertion

Answer 17

lesser tubercle of humerus

Question 18

Subscapularis Action

Answer 18

medial rotation of humerus

Question 19

Subscapularis Innervation

Answer 19

upper and lower subscapular n.

Question 20

Subscapularis Blood supply

Answer 20

subscapular a.

Question 21

Teres Major Origin

Answer 21

inferior angle of scapula

Question 22

Teres Major Insertion

Answer 22

lesser tubercle of humerus

Question 23

Teres Major Action

Answer 23

extension of humerus, adduction of humerus

Question 24

Teres Major Innervation

Answer 24

lower subscapular n

Question 25

Teres Major Blood supply

Answer 25

subscapular a., circumflex scapular a.

Question 26

Triceps brachii Origin

Answer 26

infraglenoid tubercle of scapula (long head); posterolateral surface of humerus above radial groove (lateral head); posteromedial surface of humerus below radial groove (medial head)

Question 27

Triceps brachii Insertion

Answer 27

olecranon process of ulna

Question 28

Triceps brachii Action

Answer 28

extension of forearm (all heads) extension of humerus (long head) adduction of humerus (long head)

Question 29

Triceps brachii Innervation

Answer 29

Radial n.

Question 30

Triceps brachii Blood supply

Answer 30

deep brachial and posterior circumflex humeral a.