| Term | muscle |
|---|---|
| Definition | these structures vary in shape and size, but always consist of masses of special contractile cells which are under nervous control. It is usual to describe a muscle as possessing an origin and insertion, in the sense that when the muscle contracts, the insertion moves toward the origin. It is probably more useful to regard a muscle as possessing attachments which are approximated when the whole muscle contracts. The original of a muscle is sometimes called the head and the contractile part the belly. |
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