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Fascicle Arrangement of Muscles

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Fusiform
Parallel fascicles longitudinal to the axis of the M with larger belly diameter than the tendons Ex:sternohyoid
Parallel
Parallel fascicles longitudinal to the axis of the M with the same diameter of the tendons Ex:digastric
Triangular
Fascicles oriented triangularly towards the tendon Ex:pectoralis major
Circular
Fascicles oriented in a concentric arrangement Ex:orbicularis oculi
Pennate
Unipennate=feather-fascicles arranged only on one side of tendon Ex:extensor digitorum Bipennate=fascicles arranged on both sides of tendon Ex:rectus femoris Multipennate=fascicles attached obliquely from many directions to several tendons Ex:deltoid