Muscles Connecting the Scapula to the Humerus: OINA Flashcards
Deltoid: Origin
Lateral third of clavicle, acromion, spine of scapula
Supraspinatus: Origin
Supraspinous fossa
Infraspinatus: Origin
Infraspinous fossa
Teres Major: Origin
Lower third of lateral border of scapula
Teres Minor: Origin
Upper two thirds of lateral border of scapula
Subscapularis: Origin
Subscapular fossa
Deltoid: Insertion
Middle of lateral surface of shaft of humerus
Supraspinatus: Insertion
Greater tuberosity of humerus; capsule of shoulder joint
Infraspinatus: Insertion
Greater tuberosity of humerus; capsule of shoulder joint
Teres Major: Insertion
Medial lip of bicipital groove of humerus
Teres Minor: Insertion
Greater tuberosity of humerus; capsule of shoulder joint
Subscapularis: Insertion
Lesser tuberosity of humerus
Deltoid: Innervation
Axillary nerve; C5,6
Supraspinatus: Innervation
Suprascapular nerver, C4,5,6
Infraspinatus: Innervation
Suprascapular nerver, C4,5,6
Teres Major: Innervation
Lower subscapular nerve, C6,7
Teres Minor: Innervation
Axillary nerve; C4,5,6
Subscapularis: Innervation
Upper and lower subscapular nerves, C5,6,7
Deltoid: Action
Abducts, flex and medially rotate, extend and laterally rotate
Supraspinatus: Action
Abducts arm and stabilizes shoulder joint
Infraspinatus: Action
Laterally rotates arm and stabilizes shoulder joint
Teres Major: Action
Medially rotates and adducts arms and stabilizes shoulder joint
Teres Minor: Action
Laterally rotates arm and stabilizes shoulder joint
Subscapularis: Action
Medially rotates arms and stabilizes shoulder joint
