Anatomy: Rotator Cuff Flashcards
The 4 Rotator Cuff Muscles
- Supraspinatus
- Infraspinatus
- Teres Minor
- Subscapularis
Latissimus Dorsi Origin
Inferior angle of scapula, SP’s of last 6 thoracic vertebrae, last 3-4 ribs, thoracolumbar apo., posterior iliac crest
Latissimus Dorsi Insertion
Intertubercular groove of humerus
Latissimus Dorsi Actions
- Extends shoulder
- Adducts shoulder
- Medially rotates the humerus
Latissimus Dorsi Texture and Depth
- Non-ropy
- Superficial
Deltoid Origin
Lateral 1/3 of clavicle, acromion and spine of scapula
Deltoid Insertion
Deltoid Tuberosity
Deltoid Action of ALL Fibers
Abducts shoulder
Deltoid Actions of Posterior Fibers
- Extend shoulder
- Laterally rotate shoulder
- Horizontally abduct GH
Deltoid Actions of Anterior Fibers
- Flex shoulder
- Medially rotate shoulder
- Horizontally adduct GH
Deltoid Texture and Depth
- Non-Ropy
- Superficial
Supraspinatus Origin
Supraspinous Fossa of Scapula
Supraspinatus Insertion
Greater Tubercle of Humerus
Supraspinatus Actions
- Abduct shoulder
- Stabilizes head of humerus in glenoid cavity
Supraspinatus Texture and Depth
- Non-ropy
- Deep
Infraspinatus Origin
Infraspinous fossa of scapula
Infraspinatus Insertion
Greater tubercle of humerus
Infraspinatus Action
- Laterally rotate shoulder
- Adduct shoulder
- Stabilize head of humerus in glenoid cavity
Infraspinatus Texture and Depth
- Non-ropy
- Superficial and Deep
Teres Minor Origin
Upper 2/3 of lateral border of scapula
Teres Minor Insertion
Greater tubercle of the humerus
Teres Minor Action
- Laterally rotate shoulder
- Adduct shoulder
- Stabilize head of humerus in glenoid cavity
Teres Minor Texture and Depth
- Non-ropy
- Superficial and Deep
Subscapularis Origin
Subscapular fossa of the scapula
Subscapularis Insertion
Lesser tubercle of humerus
Subscapularis Actions
- Medially rotate the shoulder joint
- Stabilize head of humerus in glenoid cavity
