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Fig. 10. Frequency distributions of hair cell orientations on lateral line canal
neuromasts in the Atlantic stingray, Dasyatis sabina. The main
neuromast and longitudinal canal axis lies along the 0180° line
(inset). Semicircular (from 0180°) angular orientations from the
canal axis are expressed as the percentage of total hair cells and compiled in
11.25° bins. Neuromasts in all three canal subsystems have the majority
(>85%) of hair cells oriented within 45° of the main canal axis, and a
small percentage oriented nearly orthogonal (90°) to this axis. However,
there are no differences in hair cell orientations among dorsal pored (Dp),
ventral pored (Vp) and ventral non-pored (Vnp) neuromasts. Sample sizes
(N) represent the number of animals, number of hair cells
measured.