. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. 378 THE SKIN AND THE SENSE-OIIGANS. a. [The nerve-plexus of the epithelium is very incomplete as compared with the plexus found in the epithelium of the cornea ; here and there a few non-medullated fibres have been traced a short distance between the epithelial cells. No such mode of nerve- terminations in the epithelium as is described by Eberth and Macul- lum in the tadpole can be found in the adult.] b. The touch-spots. What knowledge we possess of these organs is due to the labours of Leydig, Ciaecio, Eberth^ and more part
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. 378 THE SKIN AND THE SENSE-OIIGANS. a. [The nerve-plexus of the epithelium is very incomplete as compared with the plexus found in the epithelium of the cornea ; here and there a few non-medullated fibres have been traced a short distance between the epithelial cells. No such mode of nerve- terminations in the epithelium as is described by Eberth and Macul- lum in the tadpole can be found in the adult.] b. The touch-spots. What knowledge we possess of these organs is due to the labours of Leydig, Ciaecio, Eberth^ and more particularly those of Merkel. At the base of each papilla, which contains such a touch-organ, is found a number of colourless, flattened cells, arranged either in a single laj^er, or heaped up and connected with very fine nerve-fibres. Fig. 236. IL. ^m % I. Lateral sense-oigan of tadpole of frog. Half-sclieniatic. c Central zone (nerve-epithelium). Ml Membrana liniitans. p Peripheral zone (siistentacular cells). R Hyaline tube. II. Touch-corpuscle from the sheath of a digital tendon of the frog ; after Lowe. Schieck, Oc. O., Obj. 9. The flat surface of the cells is parallel to the surface of the body, and they do not form a separate or circumscribed body, they are therefore better spoken of as touch-spots than as true touch-bodies (Merkel). The larger organs are found in the papillae, but smaller ones may be found on any part of the skin. These organs are best seen in the prominence or swelling upon the supplemental toe during the breeding season; they are numerous on the dorsal surface of the trunk, but occur most frequently on the under surface of the hinder feet [Piaula jwdis). After the. 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 Ecker, Alexander, 1816-1887; Haslam, George. Oxford, Clarendon Press
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