Abstract:
:The endorgans of the inner ear of the gar were examined using transmission and scanning electron microscopy as well as nerve staining. The ultrastructure of the sensory hair cells and supporting cells of the gar ear are similar to cells in other bony fishes, whereas there are significant differences between the gar and other bony fishes in the orientations patterns of the sensory hair cells on the saccular and lagenar sensory epithelia. The saccular sensory epithelium has two regions, a main region and a secondary region ventral to the main region. The ciliary bundles on the main region are divided into two groups, one oriented dorsally and the other ventrally. Furthermore, as a result of curvature of the saccular sensory epithelium, the dorsal and ventral ciliary bundles on the rostral portion of the epithelium are rotated ninety degrees and are thus oriented on the animal's rostro-caudal axis. Hair cells on the secondary region are generally oriented ventrally. The lagenar epithelium has three groups of sensory hair cells. The groups on the rostral and caudal ends of the macula are oriented dorsally, whereas the middle group is oriented ventrally. Hair cell orientations on the utricular epithelium and macula neglecta are similar to those in other bony fishes. Nerve fiber diameters can be divided into three size classes, 1-8 microns, 9-13 microns, and 14 microns or more, with the smallest size class containing the majority of fibers. The distribution of the various classes of fiber diameters is not the same in nerve branches to each of the end organs. Similarly, the ratio of hair cells to axons differs in each end organ. The highest hair cell to axon ratio is in the utricle (23:1) and the smallest is in the macula neglecta (7:1). The number of sensory hair cells far exceed the number of eighth nerve axons in all sensory epithelia.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Mathiesen C,Popper ANdoi
10.1002/jmor.1051940203subject
Has Abstractpub_date
1987-11-01 00:00:00pages
129-42issue
2eissn
0362-2525issn
1097-4687journal_volume
194pub_type
杂志文章abstract::The silk production systems of several specimens representing at least three species of the mygalomorph genus Euagrus were examined by dissection and by a variety of absorption and fluorescent histochemical techniques. The intrageneric variation is primarily restricted to gland number, with larger numbers of glands in...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051860205
更新日期:1985-11-01 00:00:00
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更新日期:2003-04-01 00:00:00
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更新日期:2018-11-01 00:00:00
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更新日期:1980-10-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1976-01-01 00:00:00
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更新日期:1990-05-01 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:1995-02-01 00:00:00
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pub_type: 杂志文章
doi:10.1002/jmor.1051500306
更新日期:1976-11-01 00:00:00
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pub_type: 杂志文章
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更新日期:1979-11-01 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:2019-04-01 00:00:00
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journal_title:Journal of morphology
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更新日期:1989-10-01 00:00:00
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更新日期:2008-04-01 00:00:00
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更新日期:1975-10-01 00:00:00
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更新日期:1990-06-01 00:00:00
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更新日期:2008-12-01 00:00:00
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更新日期:1996-11-01 00:00:00
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更新日期:1982-03-01 00:00:00
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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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更新日期:2016-07-01 00:00:00
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