. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. SENSE-ORGANS OF THE INTEGUMENT. 167 These structures function from the Amphibia onwards as organs of taste, while in Fishes they probably serve as tactile organs. This latter function is naturally impossible in those cases where they become somewhat withdrawn inwards from the free surface of the epithelium, as is the case with those situated on the tongue, where they can only be reached by fluid passing in to them. II. TERMINAL GANGLION CELLS. These structures are not directly connected with the
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. SENSE-ORGANS OF THE INTEGUMENT. 167 These structures function from the Amphibia onwards as organs of taste, while in Fishes they probably serve as tactile organs. This latter function is naturally impossible in those cases where they become somewhat withdrawn inwards from the free surface of the epithelium, as is the case with those situated on the tongue, where they can only be reached by fluid passing in to them. II. TERMINAL GANGLION CELLS. These structures are not directly connected with the surface of the epidermis, and supporting cells are wanting. " Tactile spots," consisting of groups of " tactile cells," are met "with for the first time in tailless Amphibians, where, situated mainly on small elevations, they are distributed over the skin of the whole body (Fig. 136, a, a). In Reptiles they are. FIG -JV 136. — A TACTILE SPOT FROM THE SKIN OF THE FROG. (Modified from Merkel.) A7", nerve, which loses its medullary sheath at N* ; a, a, nemo-epithelium ; b, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, New York, Macmillan
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