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closes mouth, Closes and protrudes lips; used in whistling and forming many letters during speech; the "kissing muscle"
flexes shoulder, Chest muscle that causes shoulder flexion, adduction and horizontal adduction
draws scapula forward, a skeletal muscle that draws down the scapula or raises the ribs
flexes abdomen, Sit-up muscle. Medial trunk muscle from the pubis to the rib cage. Give abdomen a wash-board appearance. Flexes vertebral column. Compresses abdomen.
lateral roation humerus, Laterally rotates shoulder; stabilizes the head of the humerus in glenoid cavity; one of the "rotator cuff" muscles
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