. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DERMAL PLIC;E FORMATION 21 the yellow fibrous region of tympanic membrane lamina propria (Helff, 1929/0- SUMMARY AND CONCLUSIONS 1. The origin, time and separate development of the mucous and poison glands of Rana pif>icns have been determined as they are found, especially, in dermal plicae regions. The results confirm those of the majority of workers on other anurans and on urodeles. 2. Larval skin transplantations designed to test the specificity of various integuments for plicae formation were made. These included auto
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DERMAL PLIC;E FORMATION 21 the yellow fibrous region of tympanic membrane lamina propria (Helff, 1929/0- SUMMARY AND CONCLUSIONS 1. The origin, time and separate development of the mucous and poison glands of Rana pif>icns have been determined as they are found, especially, in dermal plicae regions. The results confirm those of the majority of workers on other anurans and on urodeles. 2. Larval skin transplantations designed to test the specificity of various integuments for plicae formation were made. These included autoplastic, reciprocal transplantation of skin known to normally develop dorso-lateral or lateral dermal plicae with integumentary grafts from the belly and back. In such cases no demonstrable histological differentia- tion of glandular structures was observable at the time of transplanta- tion. During metamorphosis, the various skin grafts developed the typical macroscopic and microscopic pictures of dermal plicae character- istic of the region from which transplantation was made. Back and belly integumentary grafts transplanted to dermal plicae regions main- tained their specific histological characteristics, failing in every case to develop dermal plicae structure. 3. The results are discussed and the conclusion reached that the po- tentiality to develop dermal plicae and their histological components is determined and fixed in certain bands of integument at a very early stage of larval growth. The differentiation of this integument to form dermal plicae structure is probably the result of direct hormonic influence through the blood stream at a definite stage of larval involution. LITERATURE CITED ANCEL, P., 1902. fitude du developpement des glandes de la peau des Batraciens et en particulier de la Salamandre terrestre. Arch, dc Blol., 18: 257. CALMELS, M. G., 1883. fitude histologique des glandes a venin du crapaud. Arch. de PhysioL, 15: 321. CLAUSEN, H. J., 1929. Rate of Hist
Size: 1712px × 1459px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
