Scapulohumeral (Intrinsic Shoulder) Muscles

Question 0

Deltoid Insertion

Answer 0

Deltoid tuberosity of humerus

Question 1

Deltoid Origin

Answer 1

Lateral third of clavicle; acromion and spine of scapula

Question 2

Deltoid Innervation

Answer 2

Axillary nerve (C5, C6)

Question 3

Deltoid Actions

Answer 3

Clavicular (anterior) part flexes and medially rotates should joint; acromial (middle) part abducts shoulder joint; spinal (posterior) part extends and laterally rotates shoulder joint

Question 4

Supraspinatus Origin

Answer 4

Supraspinous fossa of scapula

Question 5

Supraspinatus insertion

Answer 5

Super facet of greater tubercle of humerus

Question 6

Supraspinatus innervation

Answer 6

Suprascapular nerve (C4 C5, C6)

Question 7

Supraspinatus Actions

Answer 7

initiates and assists deltoid in abduction of shoulder joint and acts with other rotator cuff muscles

Question 8

Infraspinatus Origin

Answer 8

Infraspinous fossa of scapula

Question 9

Infraspinatus Insertion

Answer 9

Middle facet of greater tubercle of humerus

Question 10

Infraspinatus Innervation

Answer 10

suprascapular nerve (C5, C6)

Question 11

Infraspinatus Action

Answer 11

Laterally rotate shoulder joint; help hold humeral head in glenoid cavity of scapula

Question 12

Teres Minor origin

Answer 12

middle part of lateral border of scapula

Question 13

Teres Minor insertion

Answer 13

Inferior facet of greater tubercle of humerus

Question 14

teres minor innervation

Answer 14

axillary nerve (C5, C6)

Question 15

teres minor action

Answer 15

Laterally rotate shoulder joint; help hold humeral head in glenoid cavity of scapula

Question 16

Teres major origin

Answer 16

inferior part of lateral border of scapula and posterior surface of inferior angle of scapula

Question 17

Teres major insertion

Answer 17

medial lip of intertubercular sulcus of humerus

Question 18

Teres major innervation

Answer 18

Lower subscapular nerve (C5,C6)

Question 19

Subscapularis Origin

Answer 19

Subscapular fossa

Question 20

Subscapularis Insertion

Answer 20

Lesser tubercle of humerus

Question 21

Subscapularis Innervation

Answer 21

Upper and lower subscapular nerves (C5, C6, C7)

Question 22

Subscapularis Action

Answer 22

Medially rotates and adducts shoulder joint; helps hold humeral head in glenoid cavity