pennate is the opposite of parallel (fusiform) parallel muscle eg biceps brachii has fibres which run parallel, whereas pennate fibres run diagonally to the axis of movement, unipennate, bipennate and multipennate refers to the number of tendonous attachments unipennate muscle fibers which converge on one side of a tendon ca be found in the gluteus maximus, bipennate fibers converge in a featherlike way towards a central tendon, and multipennate converge on more tendons such as deltoid which has three heads.
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