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skelribs skeleton illustrationqua illustrationquad quaanatomy muscle quadriceps femoris large composed distinct heads rectus superficial muscles middle originates male human anatomy triceps render brachii commonly upper arm responsible extending elbow joint straightening arm involved push-ups bench press dips three heads:long head: largest longest head infraglenoid tubercle scapula olecranon process ulna lateral outside posterior surface humerus radial ulna