Abstract:
:Light and electron microscopic techniques show that the eye of the marine prosobranch gastropod, Ilyanassa obsoleta, is composed of an optic cavity, lens, cornea, retina, and neuropile, and is surrounded by a connective tissue capsule. The adult retina is a columnar epithelium containing three morphologically distinct cell types: photoreceptor, pigmented, and ciliated cells. The retina is continuous anteriorly with a cuboidal corneal epithelium. The neuropile, located immediately behind the retina, is composed of photoreceptor cell axons, accessory neurons, and their neurites. The embryonic eye is formed from surface ectoderm, which sinks inward as a pigmented cellular mass. At this time, the eye primordium already contains presumptive photoreceptor cells, pigmented retinal cells, and corneal cells. Several days later, just before hatching, the embryonic eye remains in intimate contact with the cerebral ganglion. It has no ciliated retinal cells, neuropile, optic nerve, or connective tissue capsule and its photoreceptor cells lack the electron-lucent vesicles and multivesicular bodies of adult photoreceptor cells. As the eye and the cerebral ganglion grow apart, the optic nerve, neuropile, and connective tissue capsule develop.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Gibsonm BLdoi
10.1002/jmor.1051810207subject
Has Abstractpub_date
1984-08-01 00:00:00pages
205-220issue
2eissn
0362-2525issn
1097-4687journal_volume
181pub_type
杂志文章abstract::The allometric relations of diameter and length of humerus, ulna, femur, and tibia of 108 specimens, from 63 different breeds of dogs and 12 specimens of wolves, were calculated by means of model II of regression or major axis method. Only for the tibia were the values of wolves included in the cluster formed for dog ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051900107
更新日期:1986-10-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1993-12-01 00:00:00
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journal_title:Journal of morphology
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051780203
更新日期:1983-11-01 00:00:00
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journal_title:Journal of morphology
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更新日期:2004-09-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2000-08-01 00:00:00
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journal_title:Journal of morphology
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更新日期:2015-03-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051980110
更新日期:1988-10-01 00:00:00
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journal_title:Journal of morphology
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更新日期:1979-01-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1992-02-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2015-10-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(199811)238:2<179::AID-JMOR
更新日期:1998-11-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2014-11-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051680309
更新日期:1981-06-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1991-09-01 00:00:00
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journal_title:Journal of morphology
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更新日期:2005-04-01 00:00:00
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journal_title:Journal of morphology
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更新日期:2015-03-01 00:00:00
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journal_title:Journal of morphology
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更新日期:1980-02-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1987-04-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1990-04-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1971-07-01 00:00:00
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journal_title:Journal of morphology
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更新日期:2013-12-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1986-12-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2006-11-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1985-05-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2011-02-01 00:00:00
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journal_title:Journal of morphology
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更新日期:2015-01-01 00:00:00
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journal_title:Journal of morphology
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更新日期:1988-07-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1991-01-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1976-11-01 00:00:00