Scapulohumeral( intrisic Shoulder) Muscles Flashcards Preview

Anatomy > Scapulohumeral( intrisic Shoulder) Muscles > Flashcards

Flashcards in Scapulohumeral( intrisic Shoulder) Muscles Deck (25)
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Deltoid proximal attachment

Lateral third of clavicle
Acromion and spine of scapula

1

Deltoid distal attachment

Deltoid tuberosity of humerus

2

Deltoid intervention

Axillary nerve c5 c6

3

Deltoid action

Clavicular(anterior) part flexes and medially rotates the arm
Acromial( middle) part abducts arm
Spinal(posterior) parts extends and laterally rotates arm

4

Supraspinatus proximal attachment

Supraspinous fossa of scapula

5

Supraspinous distal attachment

Greater tubercle of humerus (superior facet)

6

Supraspinatus innervation

Suprascapular nerve c4 c5 c6

7

Supraspinatus action

Initiates and assists deltoid in abduction of arm and acts with other rotator cuff muscles

8

Infraspinatus proximal attachment

Infraspinous fossa of scapula

9

Infraspinatus distal attachment

Greater tubercle of humerus (middle facet)

10

Infraspinatus innervation

Suprascapular nerve c5 c6

11

Infraspinatus action

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

12

Teres minor proximal attachment

Middle part of lateral border of scapula

13

Teres minor distal attachment

Greater tubercle of humerus(inferior facet)

14

Teres minor innervation

Axillary nerve c5 c6

15

Teres minor action

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

16

Teres major proximal attachment

Posterior surface of inferior angle of scapula

17

Teres major distal attachment

Medial lip of intertubercular groove of humerus

18

Teres major innervation

Lower subscapular nerve c5c6

19

Teres major action

Adducts and medially rotates arm

20

Subscapularis proximal attachment

Subscapular fossa(most of the anterior surface of scapula)

21

Subscapularis distal attachment

Lesser tubercle of the humerus

22

Subscapularis innervation

Upper and lower subscapular nerves
C5c6c7

23

Subscapularis action

Medially rotates and adducts arm
Help hold humeral head in glenoid cavity

24

The tendons of the SITS blend with the joint capsule of the glenohumeral joint, reinforcing it as the musculotendinous rotator cuff, which...

Protects the joint and gives it stability. Tonic contraction of these muscles hold the relatively large head of the humerus firmly against the shallow glenoid cavity