URI Anatomy Quiz 12: Muscles of the Upper Limb
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Its origin is the lateral 1/3 of the clavicle, acromion, and spine of the scapula. It is the prime flexor and abductor of the humerus. It also extends and hyperextends the humerus; laterally and medially rotates the humerus. Inserts on humerus. | Deltoid muscle with the axillary nerve
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It's origin is the sternum, costal cartilage of ribs 1-6 (or 7), clavicle, aponeurosis of the external oblique muscle. It Adducts, flexes, and medially rotates the humerus; sternal portion extends the humerus. Inserts on the humerus. | Pectoralis major muscle with the Medial and Lateral Pectoral nerves (C5 - T1)
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It's origin is the Iliac crest, T7-T12, ribs 10-12, and the lumbar fascia. It extends, hyperextends, adducts, and medially rotates the humerus. It inserts on the humerus. | Latissimus dorsi muscle with the thoracodorsal nerve
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It's origin is the lateral border of the scapula. It extends, adducts, and medially rotates the humerus. It inserts on the humerus. | Teres Major muscle with the lower subscapular nerve
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It's origin is the corocoid process of the scapula. It flexes and adducts the humerus and stabilizes the shoulder joint. It inserts on the humerus. | Coracobrachialis muscle with the musculocutaneous nerve
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