Studies on the vascular supply to the uterus of the cow. : 1. Morphological studies of arteries in a broad ligament.

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For the purpose to investigate the vascular system, uteri from a total of 132 Japanese native cattle were studied by means of an injection of gelatine or acrylic resin in addition to various macroscopical and microscopical preparations. Cows included are 16 heifers, 28 multiparous cows, 6 unidentified cows and 80 pregnant cows. The measurements of the diameter of arteries at various levels were undertaken to clarify the hypertrophy resulted from the pregnancy. Histological preparations of blood vessels were also studied microscopically. Those arteries supplying the uterus are uteroovarian, middle uterine and posterior uterine arteries. Among these arteries, the middle uterine artery seems to be the principal one from the viewpoint of the blood supply as well as from its distributing manner. The middle uterine artery ramifies into several branches (Rami uterini) which are arranged in medial and lateral rows while in a broad ligament. All the branches contribute to make arterial arches near the mesometrial margin of the uterus. Thus, arches arranged in double layers are shown, exclusively. The Ramuli uterini arise from this arches and reach at the mesometrial margin of the uterus, thereupon they penetrate directly into the vascular layer of the uterine wall. The posterior uterine artery divides into two branches at about the surface of an internal orifice of the cervix, after giving rise of the anastomosing branch with that of contralateral side. Branches of the posterior uterine artery anastomose with the Rami uterini of the middle uterine artery. The distributing manner of arteries supplying the uterus was classified into two types according to the degree of participation of the Ramus uterinus of the uteroovarian artery. The uteroovarian artery usually divides into Ramus ovaricus (ovarian artery) and Ramus uterinus (anterior uterine artery). In type I (8 materials out of 13), the Ramus uterinus contributes directly to the blood supply by means of the participation in an arterial arch. In type II (5 materials out of 13), meanwhile, the Ramus uterinus simply joins one of the Rami uterini of the middle uterine artery. Accordingly the Ramus uterinus of the uteroovarian artery is considered to indirectly contribute to the blood supply. The middle uterine artery in multiparous cow is clearly thicker than that in heifer even at the same age. During the pregnancy, especially in a latter half, the artery becomes thick as 2.6 to 3.5 times as that of heifer. The irreversibility not only in diameter but also in length of blood vessels resulting from the gestation was confirmed. In this respect, the proliferation of the muscular tissue seems to be responsible for the enlargement.
大阪府立大学の論文
1968-03-31

Studies on the vascular supply to the uterus of the cow. : 1. Morphological studies of arteries in a broad ligament.

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