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Fig. 8. Best frequency histograms of regular, irregular and silent primary afferent neurons from dorsal pored (Dp), ventral pored (Vp) and ventral non-pored (Vnp) hyomandibular canals in the Atlantic stingray, Dasyatis sabina. Best frequencies for primary afferents that innervate neuromasts in Dp and Vp canals are expressed re: hydrodynamic acceleration while those that innervate neuromasts in Vnp canals are expressed re: skin depression velocity. Primary afferents from Vnp canals respond best to low frequency velocity stimuli at ~5–10 Hz, while afferents from Dp canals respond best to acceleration stimuli at ~30 Hz. Vp canals responded to acceleration stimuli from 5–40 Hz, with the greatest percentage of units at 5 Hz. Silent, regular and irregular discharging primary afferents had similar best frequencies within each canal type. Sample sizes (N) show the number of animals, number of primary afferents sampled.





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