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Editor-In-Chief: C. Michael Gibson, M.S., M.D. 
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A biceps is a muscle from either of two muscle pairs (right and left) in the body. Biceps is the Latin adjective meaning two-headed. These muscles are so-called because each has two insertions at its upper end.
- In general usage, the biceps is the biceps brachii, the prominent muscle on the inside of each upper arm, popularly associated with bodily strength because it can be flexed very visibly.
- Less commonly, the biceps is the biceps femoris, one of the hamstring muscles of the underside of each thigh.
Biceps is the singular. The muscle is often mistakenly called a bicep.