Abstract：
:In Streetsia challengeri left and right eyes have fused and become a single cylindrical photoreceptor, which occupies the basal half of a forward directed head projection. This unusual compound eye consists of approximately 2500 ommatidia, which are arranged in such a way that the animal has almost circumferential vision, but cannot look ahead or behind. It is thought that the eye operates on light-guide principles, and that the crystalline cones are the major dioptric component. Ommatidia in anterior-posterior rows show a greater overlap of visual fields than dorso-ventrally arranged ommatidia. Cone layer and retinula are separated by a 4 micrometer thick screen-membrane, which contains tiny pigment granules of 0.15 micrometer diameter. Cells of unknown function and origin, containing unusual multitubular organelles, are regularly found near the proximal ends of the crystalline cone threads. The twisted rhabdoms measure 18--20 micrometer in diameter, and consist of microvilli 0.05 micrometer in width, which belong to five retinula cells and which show no trace of disintegration. The position of interommatidial screening pigment, the density of retinula cell vesicles and inclusions, and the narrowness of the perirhabdomal space all suggest that the eyes have been light-adapted at the time of fixation for electron microscopy. The retinula cell nuclei lie on the proximal side of the heavily pigmented basement membrane. A tapetum or basal retinula cells are not developed. It is concluded that the eye optimally combines acuity with sensitivity, and that for distance estimation parallax may be important.
journal_name
Cell Tissue Resjournal_title
Cell and tissue researchauthors
Meyer-Rochow VBdoi
10.1007/BF00225542subject
Has Abstractpub_date
1978-01-17 00:00:00pages
337-49issue
2eissn
0302-766Xissn
1432-0878journal_volume
186pub_type
杂志文章abstract：:Measurements of 3H-thymidine incorporation, quantitative autoradiography and morphometry were used to evaluate cell behavior during the recovery of mandibular condylar cartilage cultures following short-term exposure to a corticosteroid hormone in vitro. Apical segments of mandibular condyles of newborn mice were init...
journal_title：Cell and tissue research
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journal_title：Cell and tissue research
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更新日期：1981-01-01 00:00:00
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journal_title：Cell and tissue research
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更新日期：1983-01-01 00:00:00
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journal_title：Cell and tissue research
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更新日期：1991-11-01 00:00:00
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journal_title：Cell and tissue research
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更新日期：1998-06-01 00:00:00
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journal_title：Cell and tissue research
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更新日期：1992-07-01 00:00:00
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更新日期：1988-01-01 00:00:00
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更新日期：2015-02-01 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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更新日期：1988-05-01 00:00:00
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更新日期：1982-01-01 00:00:00
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更新日期：2014-05-01 00:00:00
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