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That would be your biceps muscle. The "two heads" in question are the muscle's two points of origin: on the coracoid process of the shoulder blade, and the glenoid cavity of the shoulder joint. The word "biceps" comes from the prefix bi-, meaning "two", and the root cap, "head" (the full Latin word for "head" is caput, capitis, n.). To be precise, this biceps is known as biceps brachii, the "biceps of the arm"; there's a second biceps in the thigh known as the biceps femoris.

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15y ago

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