Back View of Arm Muscles Small 113×320 Medium 226×640 Large 361×1024 Download TIFF Original 846×2400 | (903.7 KB) Description The muscles of the back of the arm, forearm, and hand. Keywords "arm muscles", "hand muscles", deltoid, forearm, triceps Galleries Human Muscular System Source: Cunningham, D.J. Textbook of Anatomy (New York, NY: William Wood and Co., 1903)