penniform /pen″ifôrm/ [L, penna, feather, forma, form] , pertaining to the shape of a feather, especially the patterns of muscular fasciculi that correlate with the range of motion and the power of muscles. Penniform fasciculi converge on one side of certain tendons. Muscles with more fasciculi have greater power but less range of motion than muscles with fewer fasciculi. Compare bipenniform, multipenniform.
