๐”– Bobbio Scriptorium
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Ultrastructural observations on the shell membrane of the North American opossum (Didelphis virginiana)

โœ Scribed by Krause, William J. ;Cutts, J. Harry

Publisher
John Wiley and Sons
Year
1983
Tongue
English
Weight
410 KB
Volume
207
Category
Article
ISSN
0003-276X

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โœฆ Synopsis

Abstract

Each developing opossum embryo is surrounded by a shell membrane which completely separates embryonic and maternal tissues. During the eighth and ninth prenatal days, the embryos together with their limiting shell membranes float freely within the uterine lumen, surrounded only by the secretions of the uterus. The shell membrane is transparent, nonelastic, tough, and capable of extreme deformation. It consists of a mat of interwoven fibers which vary in external diameter, are electron dense, and show no apparent substructure. The morphology and arrangement of component fibers are similar throughout the width of the shell membrane.

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โœ Terman, Jonathan R. ;Wang, Xian M. ;Martin, George F. ๐Ÿ“‚ Article ๐Ÿ“… 1998 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 928 KB

Spinocerebellar axons have been studied extensively in placental mammals, but there have been no full reports on their origin, laterality, or spinal course in any marsupial. We have used the North American opossum (Didelphis virginiana) to obtain such information and to ask whether any spinocerebell