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• W831786136 abstract "The patterns of development and distribution of collagen, reticulin, and elastin in the placentae and adnexa of the golden hamster, representing day 6 to term, were studied along with non-pregnant and post-partum uteri for comparisons. Collagen becomes widely distributed in the membranes of the gestation sac by mid-term, but diminishes in the endometrium thereafter. The distribution of reticulin follows that of collagen in large measure, and diminishes in the labyrinth in later gestation. Elastin is limited to the myometrium, to walls of umbilical vessels, and to the internal elastic membranes of arteries. Several papers have appeared in recent years concerning a variety of aspects in the development of the hamster placentae and adnexa. These include the studies of Graves (1945), Venable (1946), Ward (1948), Adams & Hillemann (1950), Orsini (1954, 1956, 1957, 1962), and Enders (1965). 1 Supported by Grant GM-10611 from the U. S. Public Health Service and by a supplemental grant-in-aid from the Graduate Council of Oregon State University. TRANS. AMER. MICROSC. Soc. 86(3): 294-303. 1967. , R. M. 1946. Cyt logie des globules c vitaires actifs et dormants chez le t rdigrade obiotus hufelandi Schultze. Arch. Anat. Mi rosc., 8: 136-150. This content downloaded from 157.55.39.27 on Mon, 05 Sep 2016 04:47:20 UTC All use subject to http://about.jstor.org/terms RITSCHARD AND HILLEMANN-HAMSTER PLACENTAL FIBROARCHITECTURE 295 In 1961, Hillemann & Gaynor included some details on the pattern of distribution of collagen, reticulin, and elastin, in their paper on the term placenta of nutria. Two abstracts by Hillemann & Ritschard (1963, 1964) served as preliminary accounts of these three fibers in chinchilla, nutria, and baboon term placentae. In 1967 these two authors published an extended account on the comparative fibroarchitecture of the term placentae of these three animals. The connective tissue fibers of the hamster placentae and adnexa have not been investigated, save for a brief reference in the Hillemann & Ritschard abstract of 1963. The paragraphs below include not only an account of the three above-mentioned connective tissue fibers in the term hamster placentae and adnexa, but also the content of these fibers in the developing hamster placentae and adnexa, including time of appearance, distribution, arrangement, and quantitative changes, beginning with the sixth day of gestation and extending to term on day 16. Additionally, both the non-pregnant and post-partum (day one) uteri were included for comparisons. The synopsis (Table I) in the paper by Hillemann & Ritschard (1967) containing information historically pertinent to the subject at hand, may be economically brought up to date by including references not only to this presentation, but also to Hillemann & Ritschard (1967) and Tenzer (1963). No previous work so far as the authors can ascertain, has given attention to the day by day developing patterns of these fibers in any placenta or associated membranes. MATERIALS AND METIODS The gestation ages of placentae taken from 15 hamsters were determined on the basis of the time which elapsed from observed coitus to time of autopsy. One non-pregnant, and one post-partum (day 1) uterus was included for comparison. A 16-day pregnancy period was used; in Table I, day 17 post-partum is the first day following the day of parturition. The smaller loculi were fixed whole, but the larger ones were injected through the anti-mesometrial aspect of the uterine wall and into the yolk sac. As Bouin's fluid, or Zenker's fixative was injected, a nearly equivalent amount of amniotic fluid was allowed to escape through an adjacent puncture. Following dehydration in a graded series of alcohol (for Bouin-fixed material) or dioxane (for Zenker-fixed material), clearing in xylene, embedding in paraffin (56-58 C), the tissues were sectioned at 7-12 ft. Infiltration of the larger loculi was facilitated with a vacuum pump. Harris' hematoxylin, and eosin were used as stains for general histology, Foot's method (Lillie, 1954) for reticulin (argyrophilic fibers), MacCallum's modification of Verhoeff's stain (Krajian & Gradwohl, 1952) or the orcinol new fuchsin method (Fullmer & Lillie, 1956) for elastin, and a modification of Masson's trichrome (Davenport, 1960) for collagen. The latter (an improvised collagen stain) consisted of a substitution of Biebrich's scarlet for ponceau 2R (staining time 1-2 min). Rapid dehydration prevented the loss of both the aniline blue and scarlet stains." @default.
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• W831786136 date "1967-07-01" @default.
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• W831786136 title "The Patterns of Development and Distribution of Collagen, Reticulin, and Elastin in the Placentae of the Golden Hamster (Mesocricetus auratus Waterhouse)" @default.
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• W831786136 doi "https://doi.org/10.2307/3224596" @default.
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