Deep Shoulder Flashcards
Scapulohumeral (Intrinsic) Musculature
These muscles attach the
They move the —, and contribute to the — of this joint
They are all innervated by the
scapula to the humerus
humerus at the shoulder joint, stabilization
brachial plexus
Scapulohumeral (Intrinsic) Musculature includes (2)
- deltoid
* teres major
Rotator Cuff Muscles (4)
- subscapularis
- supraspinatus
- infraspinatus
- teres minor
Deltoid: Proximal Attachment (3)
lateral 1/3 of clavicle,
acromion,
spine of scapula
Deltoid:
Distal attachment
deltoid tuberosity of humerus
Deltoid:
Actions
flexes, medially rotates, abducts, extends, and laterally rotates humerus
Deltoid:
Innervation
axillary nerve (C5, C6)
Teres major:
Proximal Attachment
posterior surface of inferior angle of scapula
Teres major:
Distal Attachment
medial lip of intertubercular (bicipital) groove of humerus
Teres major:
Actions
adducts and medially rotates humerus
Teres major:
Innervation
-lower subscapular nerve (C5, C6)
Supraspinatus:
Proximal Attachment
supraspinous fossa of scapula
Supraspinatus:
Distal Attachment
superior facet of greater tubercle of humerus
Supraspinatus:
Actions (2)
works with deltoid in abduction of humerus,
acts with other rotator cuff muscles in stabilizing shoulder joint
Supraspinatus:
Innervation
-suprascapular nerve (C4, C5, C6)
Infraspinatus:
Proximal Attachment
-infraspinous fossa of scapula
Infraspinatus:
Distal Attachment
-middle facet of greater tubercle of humerus
Infraspinatus:
Actions (2)
laterally rotates humerus,
helps hold humeral head in place
Infraspinatus:
Innervation
suprascapular nerve (C5, C6)
Teres minor:
Proximal Attachment
middle part of lateral border of scapula
Teres minor:
Distal Attachment
inferior facet of greater tubercle of humerus
Teres minor:
Actions (2)
laterally rotates humerus,
helps hold humeral head in place
Teres minor:
Innervation
-axillary nerve (C5 & C6)
Subscapularis:
Proximal Attachment
-subscapular fossa (anterior surface
of scapula
