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The structure of the embryonic external gill filaments of the Velvet belly shark Etmopterus spinax
Author(s) -
Kryvi Harald
Publication year - 1976
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.1976.tb04677.x
Subject(s) - biology , endoplasmic reticulum , basal lamina , golgi apparatus , anatomy , microbiology and biotechnology , embryonic stem cell , fibril , vesicle , epithelium , ultrastructure , biophysics , membrane , biochemistry , gene , genetics
The purely embryonic external gill filaments of sharks consist of a single capillary loop, covered by a two‐layered epithelium with short microvilli. Towards the end of the embryonic period, the epithelial cells are filled with fibrils, about 10 nm in diameter, and mitochondria, endoplasmic reticulum and Golgi bodies disappear. The basal lamina increases in thickness, and collagen fibrils accumulate beneath. Numerous dense vesicles appear in the endothelial cells.