Abstract:
:The pattern of onset and general rate of cranial ossification are compared in two marsupials, Monodelphis domestica (Didelphidae) and Macropus eugenii (Macropodidae). In both species a similar suite of bones is present at birth, specifically those surrounding the oral cavity and the exoccipital, and in both postnatal events follow a similar course. The facial skeleton matures more rapidly than the neurocranium, which is characterized by an extended period of ossification. Most dermal bones begin ossification before most endochondral bones. Endochondral bones of the neurocranium are particularly extended in both the period of onset of ossification and the rate of ossification. These data confirm suggestions that morphology at birth is conservative in marsupials and we hypothesize that the pattern of cranial osteogenesis is related to two distinct demands. Bones that are accelerated in marsupials are correlated with a number of functional adaptations including head movements during migration, attachment to the teat, and suckling. However, the very slow osteogenesis of the neurocranium is probably correlated with the very extended period of neurogenesis. Marsupials appear to be derived relative to both monotreme and placental mammals in the precocious ossification of the bones surrounding the oral cavity, but share with monotremes an extended period of neurocranial osteogenesis.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Clark CT,Smith KKdoi
10.1002/jmor.1052150203subject
Has Abstractpub_date
1993-02-01 00:00:00pages
119-49issue
2eissn
0362-2525issn
1097-4687journal_volume
215pub_type
杂志文章abstract::Analysis of lateral and dorsoventral radiographic films shows that ingestion, transport, and mastication in Pedetes capensis (Rodentia) are cyclic and their movement patterns are essentially similar for the three food types offered. During the ingestion cycle, closing of the mouth is accompanied by a backward translat...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052050310
更新日期:1990-09-01 00:00:00
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journal_title:Journal of morphology
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更新日期:2015-06-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052010206
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051500308
更新日期:1976-11-01 00:00:00
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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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.1051650102
更新日期:1980-07-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052070307
更新日期:1991-03-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052250107
更新日期:1995-07-01 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:2003-05-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051990307
更新日期:1989-03-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051600103
更新日期:1979-04-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051920205
更新日期:1987-05-01 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:1993-03-01 00:00:00
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journal_title:Journal of morphology
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更新日期:1977-03-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(199603)227:3<335::AID-JMOR
更新日期:1996-03-01 00:00:00
abstract::Transmission electron microscopy reveals that the spermatocytes of the hookworm Ancylostoma caninum contain an abundance of Golgi complexes, ribosomes, specialized membranous organelles, and long strands of smooth endoplasmic reticulum. These organelles remain abundant until the early spermatid stage of sperm developm...
journal_title:Journal of morphology
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更新日期:1990-03-01 00:00:00
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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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:2009-09-01 00:00:00
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journal_title:Journal of morphology
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更新日期:2020-02-01 00:00:00
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journal_title:Journal of morphology
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更新日期:2002-02-01 00:00:00
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journal_title:Journal of morphology
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更新日期:1986-04-01 00:00:00
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更新日期:2018-05-01 00:00:00
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journal_title:Journal of morphology
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更新日期:1980-09-01 00:00:00
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journal_title:Journal of morphology
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