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Opposable thumbs: Old World monkeys (Circopithecidae) except colobus, and all great apes; Opposable with comparatively long thumbs: gibbons (or lesser apes).

Thumb, short, thick first digit of the human hand and of the lower-primate hand and Sign up here to see what happened On This Day, every day in your inbox!

Most thumb sprains involve the ulnar collateral ligament, which is located on the inside of the knuckle joint. A tear to this ligament can make your thumb feel. Flexion and extension can occur at all three joints of the thumb, including CMC, MCP, and IP joint. The motions at the CMC joint are often not.