Scapulohumeral Muscles Flashcards Preview

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Flashcards in Scapulohumeral Muscles Deck (29):
0

What are the scapulohumeral muscles

deltoid
teres major
supraspinatus
infraspinatus
subscapularis
teres minor

1

deltoid origin

lateral third of clavicle, acromion and spine of scapula

2

deltoid insertion

deltoid tuberosity of humerus

3

deltoid innervation

axillary nerve
c5, c6

4

deltoid main actions

clavicular (anterior) part flexes and medially rotates shouder join
acromial (middle) part abducts shoulder joint
spinal (posterior) part extends and laterally rotates shoulder joint

5

supraspinatus origin

supraspinous fossa of scapula

6

supraspinatus insertion

superior facet of greater tubercle of humerus

7

supraspinatus innervation

suprascapular nerve
C4, C5, C6

8

supraspinatus action

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

9

infraspinatus origin

infraspinous fossa of scapula

10

infraspinatus insertion

middle facet of greater tubercle of humerus

11

infraspinatus innervatin

suprascapular nerve
c5 c6

12

infraspinatus action

lateraly rotate shoulder joint, help hold humeral head in glenod cavity of scapula

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 shoulder joint, help hold humeral head in glenoid cavity of scapula

17

teres major origin

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

18

teres major insertion

medial lip of intertubercular sulcus of humerus

19

teres major innervation

lower subscapular nerve
c5 c6

20

teres major action

adducts and medially rotates shoulder joint

21

subscapularis origin

subscapular fossa (most of anterior surface of scapula)

22

subscapularis insertion

lesser tubercle of humerus

23

subscapularis innervation

upper and lower subscapular nerves
c5, c6, c7

24

subscapularis action

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

25

rotator cuff muscles

supraspinatus, infraspinatus, teres minor, subscapularis
form a musculotendinous rotator cuff around glenohumeral joint
all except supraspinatus are rotators of te humerus
tonic contraction holds humerus firmly against glenoid cavity

26

Quadrangular region

Inferior border of teres minor
Superior border f teres major
Lateral border of long head of triceps brachii
Humerus
Contains axillary nerve, and posterior circumflex humeral artery

27

Median triangle

Superior border of teres major
Inferior border of teres minor
Medial border of long head of triceps brachii
Contains circumflex scapular artery

28

Triceps hiatus

Inferior border of teres major
Lateral border of long head of triceps brachii
Humerus
Contains profunda brachii (deep brachial) artery and radial nerve