Japanese Journal of Veterinary Research;Volume 8, Number 1-4

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HISTOLOGICAL STUDIES ON THE OVARIES OF SOWS III. : ON THE ELASTIC FIBERS OF THE WALL OF BLOOD VESSELS IN VARIOUS HISTOLOGICAL STRUCTURES

YAMASHITA, Tadayuki

Permalink : http://hdl.handle.net/2115/4681
JaLCDOI : 10.14943/jjvr.8.1-4.221

Abstract

The results of this research may be summarized as follows. 1) Various arterioles found in the 6 groups of the structures of pig ovaries were divided into 14 types. 2) In this research all of normal vesicular follicles in the process of the maturation, mature ones and ones just before the rupture showed the same finding : i.e., newly formed arterioles and normal small ones were found only in the theca externa. 3) Atretic follicles were divided into 3 types. 4) At the early stage of regressive processes the findings of arterioles found in follicle walls are similar to those of normal vesicular follicles. At the middle stage new arterioles protrude actively from the theca externa into the theca interna. And at the last stage, according to the hyalinization of the inner walls of follicles, arterioles themselves in such parts come to undergo the hyaline swelling of the intermediate coat, and finally disappear gradually. 5) Corpora lutea of non-pregnancy were divided into 6 types. 6) At the vascularization stage of corpora lutea of this group, new arterioles protrude actively from the capsule into the lutein cell layer, and at the fullyformed stage these arterioles reach as far as in the deep portions of the lutein cell layers. At the beginning stage of the regressive process, normal arterioles with the marked internal elastic membrane are found in the periphery of the lutein cell layer. Arterioles with arteriosclerotic changes appear at the middle stage of the regressive process for the first time; namely relatively large arterioles under the capsule show increase of elastic fibers in the intermediate coat. At the last stage, with hyalinization of the interstitial tissues, arterioles themselves undergo hyaline swelling of the wall, and collapse gradually. 7) Vascular bodies were divided into 3 types. 8) Arterioles found in the vascular bodies show heavy arteriosclerotic changes in comparison with those of corpora lutea of non-pregnancy : that is to say they are found with conspicuous thickening of the internal elastic membrane and hyperplastic swelling of the inner coat. Only such arterioles remain in spite of the disappearance of lutein cells and of interstitial tissues according to the hyalinization, showing characteristic appearances as vascular bodies. The writer wishes to express his sincere thanks to Prof. K. TAKAHATA, chief of the Department of Veterinary Anatomy, for his kind direction and review. Further he would like to express his cordial thanks to the members of the staff of the Department who assisted in this research.

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