'Arm Bones and Muscles. Humerus, Radius, Ulna, Biceps, and Triceps'

'We talk about the 3 bones in your arm: Humerus is your upper arm bone. Radius is your lower arm bone on the thumb side. Ulna is your lower arm bone on your pinkie finger side. Biceps is the muscle on the front of your upper arm. Triceps is the muscle on the back of your upper arm' 

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