Fusiform muscle

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A muscle that has a shape of spindle, which is being wider in the middle and narrowing towards both ends.


Example of fusiform muscle is the biceps brachii.

Fusiform muscles are arranged in a strap-like fashion to provide the greatest degree of shortening, thus, enabling the muscle to produce quick and wide range of motion. However, compared with penniform muscle, they are not a very powerful type of muscle.

Word origin: Latin, fusus
Synonym: musculus fusiformis, spindle-shaped muscle.
Compare: penniform muscle.
See also: muscle.