Scapulo-Humeral Intrinsic Muscles Flashcards
Deltioid: Insertion
Deltoid tuberosity of humerus
Deltoid: Origin
Lateral 3rd of clavicle
Acromion of scapula
Spine of scapula
Deltoid: Innervation
Axillary Nerve
C5, C6
Action of Clavicular head of Deltoid?
Flex and medically rotate shoulder joint
Action of Acromial head of Deltoid?
Abduct shoulder joint
Action of Spinal head of Deltoid?
Extends and laterally rotate shoulder joint
Supraspinatus: Origin
Supraspinous fossa of scapula
Supraspinatus: Insertion
Superior facet of greater tubercle of humerus
Supraspinatus: Innervation
Suprascapular Nerve
C4-C6
Supraspinatus: Action
Stabilizes scapula by drawing inferiorly and anteriorly against thoracic wall
Infraspinatus: Origin
Infraspinous fossa of scapula
Infraspinatus: Insertion
Middle facet of greater tubercle of humerus
Infraspinatus: Innervation
Suprascapular Nerve
C5, C6
Infraspinatus: Action
Laterally rotate shoulder joint
Hold humeral head in glenoid cavity
Teres Minor: Insertion
Inferior facet of greater tubercle of humerus
Teres Minor: Innervation
Axillary Nerve
C5, C6
Teres Minor: Action
Adducts and medially rotates shoulder joint
Teres Minor: Origin
Medial part of lateral border of scapula
Teres Major: Origin
Inferior part of lateral border of scapula
Posterior surface of inferior angle of the scapula
Teres Major: Insertion
Medial lip of intertubercular sulcus of humerus
Teres Major: Innervation
Lower Subscapular Nerve
C5, C6
Teres Major: Action
Adducts and medially rotates shoulder joint
Subscapularis: Origin
Subscapular fossa
Subscapularis: Insertion
Lesser tubercle of humerus
