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标题：The Notochordal Sheath in Amphioxus – An Ultrastructural and Histochemical Study
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作者：Bočina, Ivana ; Saraga-Babić, Mirna
期刊名称：Collegium Antropologicum
印刷版ISSN：0350-6134
出版年度：2006
卷号：30
期号：2
页码：361-367
出版社：Hrvatsko antropološko društvo
摘要：The notochord and notochordal sheath of 10 adult amphioxus were investigated ultrastructurally and histochemically. The notochord in amphioxus consists of parallel notochordal cells (plates) and each plate consists of parallel thicker and thinner fibrils and numerous profiles of smooth endoplasmic reticulum situated just beneath the cell membrane. Histochemical staining shows that the notochordal plates resemble neither the connective tissue notochordal sheath nor the typical muscular structure myotomes. The notochordal sheath has a complex three-layered organization with the outer, middle and inner layer. The outer and middle layer are composed of collagen fibers of different thickness and course, that correspond to collagen type I and collagen type III in vertebrates, respectively, and the inner layer is amorphous, resembles basal lamina, and is closely attached to the notochord by hemidesmosome junctions. These results confirm the presence of collagen fibers and absence of elastic fibers in amphioxus.
关键词：amphioxus; notochord; notochordal sheath; electron microscopy