CELLULAR-ELEMENTS OF THE DERMIS AND COLLAGEN REMODELING DURING LARVAL LIFE OF ANURANS
CELLULAR-ELEMENTS OF THE DERMIS AND COLLAGEN REMODELING DURING LARVAL LIFE OF ANURANS
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DOI：
10.1679/aohc.53.381
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发表时间：
1990-10-01
影响因子：
--
通讯作者：
WHITEAR, M
中科院分区：
文献类型：
--
作者：
FOX, H;WHITEAR, M
通过电子显微镜观察了三种无尾动物幼虫的胶原真皮的分化。根据细胞元素的组织，事件可以分为五个阶段。胶原蛋白的最初分泌似乎来自表皮，但成纤维细胞从早期就存在。除了分泌之外，成纤维细胞还对原纤维进行吞噬作用，最常见于鳃盖形成和变态时。在大多数幼虫阶段，真皮由规则的胶原纤维层组成，被下面的成纤维细胞的过程穿透并被神经穿过，细胞层定义了深面。在林蛙中，这些细胞含有巨大的液泡，被称为“区室细胞”，但蟾蜍和爪蟾中不存在液泡。就在变态之前，成纤维细胞和色素细胞迁移到真皮中，并建立松弛层。表皮下留有几层幼虫胶原纤维，大部分幼虫真皮成为致密层。在幼虫生活期间，皮下组织含有色素细胞、毛细血管和游走白细胞。真皮仅在变态时获得血液循环，此时皮下淋巴囊和垂直平滑肌已建立。
The differentiation of the collagenous dermis has been followed by electron microscopy in larvae of three anuran species. Events can be divided into five phases, depending on the organization of the cellular elements. Initial secretion of collagen appears to be from the epidermis but fibroblasts are present from early stages. Apart from secretion, there is phagocytosis of fibrils by fibroblasts, seen most frequently when the operculum is formed and at metamorphosis. In most larval stages, the dermis consists of regular plies of collagen fibrils, penetrated by processes from underlying fibroblasts and crossed by nerves, with a cellular layer defining the deep face. In Rana, these cells contain enormous vacuoles and have been called "compartmented cells", but the vacuoles are absent in Bufo and Xenopus. Just before metamorphosis, fibroblasts and chromatophores migrate into the dermis, and establish a stratum laxum. A few plies of larval collagen fibrils are left under the epidermis, the bulk of the larval dermis becomes the stratum compactum. During larval life, the hypodermis contains chromatophores, blood capillaries and wandering leucocytes. The dermis gains a blood circulation only at metamorphosis, when subdermal lymph sacs and vertical smooth muscles are established.