Shoulder

Question 1

What are the muscles of the shoulder?

Answer 1

Deltoideus, subscapularis, supraspinatus, infraspinatus, teres minor, teres major

Question 2

What are the muscles of the rotator cuff?

Answer 2

Subscapularis, supraspinatus, infraspinatus, teres minor

Question 3

Deltoid origin and insertion

Answer 3

Lateral third of clavicle (anterior head), acromion (middle head), and spine of the scapula (posterior head)
Deltoid tuberosity of humerus

Question 4

Deltoid innervation and spinal levels

Answer 4

Axillary n.
Mostly C5; also C6

Question 5

Deltoid actions

Answer 5

Abduction after first 15 degrees
Anterior head flexes and medially rotates the humerus
Posterior head extends and laterally rotates the humerus

Question 6

Subscapularis origin and insertion

Answer 6

Subscapular fossa of scapula
Lesser tubercle of the humerus

Question 7

Subscapularis innervation and spinal levels

Answer 7

Upper and lower subscapular nn.
Mostly C6; also C5, C7

Question 8

Subscapularis action

Answer 8

Medial rotation of the humerus

Question 9

Supraspinatus origin and insertion

Answer 9

Supraspinous fossa of scapula
Superior facet of greater tubercle

Question 10

Supraspinatus innervation and spinal levels

Answer 10

Suprascapular n.
Mostly C5; also C4, C6

Question 11

Supraspinatus actions

Answer 11

Initiates abduction of the humerus at the glenohumeral joint, laterally rotates the humerus when decelerating the arm in a throwing motion

Question 12

Infraspinatus origin and insertion

Answer 12

Infraspinous fossa of scapula
Middle facet of greater tubercle

Question 13

Infraspinatus innervation and spinal levels

Answer 13

Suprascapular n.
Mostly C5; also C6

Question 14

Infraspinatus action

Answer 14

Lateral rotation of the humerus

Question 15

Teres minor origin and insertion

Answer 15

Upper part of lateral border of scapula
Inferior facet of greater tubercle

Question 16

Teres minor innervation and spinal levels

Answer 16

Axillary n.
Mostly C5; also C6

Question 17

Teres minor action

Answer 17

Lateral rotation of the humerus

Question 18

Teres major origin and insertion

Answer 18

Lower lateral border and inferior angle of the scapula
Medial lip of intertubercular groove

Question 19

Teres major innervation and spinal levels

Answer 19

Lower subscapular n.
C5, C6

Question 20

Teres major action

Answer 20

Adducts and medially rotates the humerus

Question 21

What are the anatomical spaces in the dorsal aspect of the shoulder?

Answer 21

Triangular space, quadrangular space, triangular interval

Question 22

What borders the triangular space?

Answer 22

Teres minor superiorly, teres major inferiorly, triceps long head laterally

Question 23

What is in the triangular space?

Answer 23

Circumflex scapular a.

Question 24

What borders the quadrangular space?

Answer 24

Teres minor superiorly, teres major inferiorly, triceps long head medially, triceps lateral head laterally

Question 25

What is in the quadrangular space?

Answer 25

Axillary n. and posterior humeral circumflex a.

Question 26

What borders the triangular interval?

Answer 26

Teres major superiorly, triceps long head medially, triceps lateral head laterally

Question 27

What is in the triangular interval?

Answer 27

Radial n. and profunda brachii a.