. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. and below the eponychium — my observations in this respect [according perfectly with the descriptions of Kölliker as opposed to Zander. Figure 4 represents the nail of the toe in embryos of between 4 and 5 months. Here the bladder and irregular cells covering the nail formation have undergone a partial keratosis, and those situated near the fold of the nail are loose and scaly in appearance. At the edge of the nail these cells are heaped up in still greater numbers, and are continuous with the scales of the plantar surface, w
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. and below the eponychium — my observations in this respect [according perfectly with the descriptions of Kölliker as opposed to Zander. Figure 4 represents the nail of the toe in embryos of between 4 and 5 months. Here the bladder and irregular cells covering the nail formation have undergone a partial keratosis, and those situated near the fold of the nail are loose and scaly in appearance. At the edge of the nail these cells are heaped up in still greater numbers, and are continuous with the scales of the plantar surface, which are also derived from these elements. Figure 5 represents a section of a toe during the 5"» month. Here the nail is freed from its epitrichial (or eponychial) covering over its greater part. At eo are to be seen the remains of the eponychium over the nail fold, which are united with the horny layer of the back of the Fig. 5. Great toe of an embryo of the 5* month, eo eponychium. «e nail edge. tl stratum lucidum, n nail. Acid fuchsine preparation. The appearances at the edge of the nail have not, it seems to me, received a correct interpretation. At ne is seen the epitrichial layer of the edge of the nail which has become the stratum corneum, by a metamorphosis of the bladder cells, as a comparison of the three figures will show. K6lliker says of this period: „Das distale Ende des Nagelfeldes trug ein Stratum corneum aus einigen Zellenlagen, die am Nagelsaume zu einem dicken Wulste sich entwickelten, der nun ganz und gar aus Schüppchen bestand und keine Spur der Blasenzellen der früheren Zeiten ; Examination of numerous specimens of toes and fingers has convinced me that this horny projection remaining at the edge of the nail is produced by a keratosis of the bladder cells, and represents a persistance of the epitrichial layer at this point, and pot as Kölliker implies, a heaping up of scales derived from the. Please note that these images a
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