Muscles with a triangular shape,such as the pectoralis major muscle in the chest,typically have a:

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Muscles with a triangular shape typically have a convergent fascicle arrangement where the muscle fibers converge from a broad origin to a narrow insertion. This allows for a greater force to be generated compared to parallel fascicle arrangement. Unipennate and spiral fascicle arrangements are not typically associated with triangular-shaped muscles.

Muscles with a Triangular Shape,such as the Pectoralis Major Muscle