Scapulohumeral (Intrinsic Shoulder) Muscles Flashcards Preview

Gross Anatomy > Scapulohumeral (Intrinsic Shoulder) Muscles > Flashcards

Flashcards in Scapulohumeral (Intrinsic Shoulder) Muscles Deck (25):
1

Deltoid Origin-3

-Lateral 1/3 of clavicle
-Acromion
-Spine of scapula

2

Deltoid Insertion

Deltoid tuberosity of humerus

3

Deltoid Innervation

Axillary nerve (C5, C6)

4

Deltoid Action-3

Anterior-Flexes and medially rotates arm
Middle-Abducts arm
Posterior-Extends and laterally rotates arm

5

Supraspinatous Origin

Supraspinous fossa of scapula

6

Supraspinatous Insertion

Superior facet of greater tubercle of humerus

7

Supraspinatous Innervation

Suprascapular nerve (C4, C5, C6)

8

Supraspinatous Action

Initiates and assists deltoid in abduction of arm

9

Infraspinatous Origin

Infraspinous fossa of scapula

10

Infraspinatous Insertion

Middle facet of greater tubercle of humerus

11

Infraspinatous Innervation

Suprascapular nerve (C5, C6)

12

Infraspinatous Action

Laterally rotate arm

13

Teres minor Origin

Middle part of lateral border of scapula

14

Teres minor Insertion

Inferior facet of greater tubercle of humerus

15

Teres minor Innervation

Axillary nerve (C5, C6)

16

Teres minor Action

Laterally rotate arm

17

Subscapularis Origin

Subscapular fossa

18

Subscapularis Insertion

Lesser tubercle of humerus

19

Subscapularis Innervation

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

20

Subscapularis Action

Medially rotates and adducts arm

21

Teres Major Origin

Posterior surface of inferior angle of scapula

22

Rotator cuff muscles collective action

Their primary function during all movements of the shoulder is to hold the humeral head in the glenoid cavity

23

Teres Major Insertion

Medial lip of interubercular groove of humerus

24

Teres Major Innervation

Lower subscapular nerve (C5, C6)

25

Teres Major Action

Adducts and medially rotates arm