Abstract:
:The fine structure of the horny teeth of the lamprey, Entosphenus japonicus, was examined by light- and electron-microscopy. Most of the horny teeth consisted of two horny and two nonhorny layers. The primary horny layer was well keratinized, and the cells were closely packed and intensely interdigitated, being joined together by many modified desmosomes. The plasma membrane of the horny cell, unlike the membranes of other vertebrates, was not thickened. The intercellular spaces were filled with electron-dense material. Microridges were seen on the free surface. Structures resembling microridges were found on the underside of the primary horny layer. The secondary horny layer displayed various stages of keratinization. The keratinization started at the apex and developed toward the base. In the early stage of keratinization, the superficial cells became cylindrical and were arranged in a row forming a dome-shaped line. Their nuclei were situated in the basal part of the cells. The appearance of the nonhorny layers varied according to the degree of keratinization of the horny layers beneath them. The nonhorny cells were joined together by many desmosomes and possessed many tonofilament bundles. The replacement and keratinization of the horny teeth are discussed in the light of these results.
journal_name
Cell Tissue Resjournal_title
Cell and tissue researchauthors
Uehara K,Miyoshi S,Toh Hdoi
10.1007/BF00215769subject
Has Abstractpub_date
1983-01-01 00:00:00pages
1-15issue
1eissn
0302-766Xissn
1432-0878journal_volume
231pub_type
杂志文章abstract::The ultrastructure of the mid-gut cells of female Nasonia vitripennis is described. The mid-gut consists of a uniform, single-cell epithelium. The cells of different gut regions were analysed using morphometric techniques in order to determine any differences in the components. The structure of the cells is described ...
journal_title:Cell and tissue research
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journal_title:Cell and tissue research
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journal_title:Cell and tissue research
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journal_title:Cell and tissue research
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pub_type: 杂志文章,评审
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journal_title:Cell and tissue research
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journal_title:Cell and tissue research
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journal_title:Cell and tissue research
pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:1991-05-01 00:00:00
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journal_title:Cell and tissue research
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journal_title:Cell and tissue research
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journal_title:Cell and tissue research
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journal_title:Cell and tissue research
pub_type: 杂志文章
doi:10.1007/BF00239453
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