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Muscles I
Shoulder & Arm
Question | Answer |
---|---|
Deltoid: Origin | Lateral one-third of clavicle, acromion, and spine of scapula |
Deltoid: Insertion | Deltoid tuberosity |
Deltoid: Action | ABduct, flex, medially & laterally rotate, extension and horizontally ABduct & ADduct the shoulder |
Pectoralis Major: Origin | Medial half of clavicle, sternum, cartilage of ribs 1-6 |
Pectoralis Major: Insertion | Crest of greater tubercle of humerus |
Pectoralis Major: Action | ADduct, medially rotate, flex, horizontally ADduct, and extend the shoulder |
Pectoralis Minor: Origin | Third, fourth and fifth ribs |
Pectoralis Minor: Insetion | Corcoid process of scapula |
Pectoralis Minor: Action | Depress, ABduct and anteriorly tilt the scapula |
Trapezius: Origin | Occipitial and SPs of C7 through T12 |
Trapezius: Insertion | Lateral one-third of clavicle, acromion, and spine of scapula |
Trapezius: Action | Rotate to opposite side, flex to same side and extend head and neck; elevate, upwardly rotate, ADduct, depress, and stabalize scapula |
Latissimus Dorsi: Origin | SPs of T6 through T12, last 3-4 ribs, and posterior iliac crest |
Latissimus Dorsi: Insertion | Crest of lesser tubercle of humerus (Bicepital goove) |
Latissimus Dorsi: Action | Extend, ADduct and medially roate the shoulder |
Teres Major: Origin | Lateral border of scapula |
Teres Major: Inerstion | Crest of lesser tubercle of humerus |
Teres Major: Action | Extend, ADduct and medially roate the shoulder |
Supraspinatus: Origin | Supraspinatus fossa of scapula |
Supraspinatus: Insertion | Greater tubercle of humerus |
Supraspinatus: Action | ABduct the shoulder, stabilizes head humerus in glenoid cavity |
Infraspinatus: Origin | Infraspinatus fossa of scapula |
Infraspinatus: Insertion | Greater tubercle of humerus |
Infraspinatus: Action | Lateraly rotate, ADduct, extend and horizontally ABduct the shoulder; stabilize head of humerus |
Teres Minor: Origin | Superios half of lateral border of scaupla |
Teres Minor: Insertion | Greater tubercle of humerus |
Teres Minor: Action | Lateraly rotate, ADduct, extend and horizontally ABduct the shoulder; stabilize head of humerus |