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Top of the limb may be divided in to three parts arm, forearm, and hand. The key bone associated with arm, humerus, connects the ulna and radius (bones for the forearm) using the scapula. The forearm extends through the shoulder to the wrist and it has two categories of muscle tissue, the anterior flexor group, while the posterior extensor group. These muscle tissue have the effect of motions during the wrist, metacarpophalangeal joints, and interphalangeal joints. These muscles
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