大鼠输卵管的微血管构筑——扫描电镜观察

MICROVASCULAR ARCHITECTURE OF THE RAT OVIDUCT

用扫描电镜的方法,观察了20只未妊娠的雌性Wistar大鼠输卵管的微血管构筑。结果表明,输卵管的血供来自卵巢动脉的2～4支输卵管支(管径0.2～0.3mm)。输卵管支进入管壁后,即分支形成略为弯曲的微动脉(管径0.02～0.07mm),由微动脉发出的分支,在管壁内形成3个血管层:1.弯曲而呈网络状的浆膜下血管网;2.呈平行树枝状分布的肌层血管丛;3.由微动脉末端在粘膜皱襞顶端分支吻合所形成的致密的上皮下毛细血管网。后者在繖部的密度明显高于近子宫端处。管壁内静脉较少弯曲,与动脉的伴行关系不如系膜内明显。有些毛细血管和微静脉呈直角注入小静脉。

Microvascular architecture of the oviduct was observed by SEM in 20 adult female Wistar rats which were not pregnant. The oviduct was supplied by 2-4 tubal branches (0.2-0.3mm in diameter) which were derived from the ovarian artery. The tubal branches entered the wall of oviduct and divided into numerous meandering arterioles (0.02-0.07mm in diameter). Intrinsic microvasculature of the oviduct might be divided into three layers: (1) the subserosal vascular plexus which appeared tortuous and formed reticulate anastomosis, (2) a parallel branching vasculature in the muscle coat, and (3) the subepithelial capillary network. The latter arised from the arterioles which ramified terminally near the apex of mucosal folds and broke up into very dense capillaries. Subepithelial capillary density in the fimbriae was markedly higher than that in the isthmus and uterine part. Intrinsic venules of oviduct were less tortuous and less closely accompanied with the arterioles. In mesoviduct, veins were in closely accompanied with the corresponding arteries. In the wall of oviduct, some capillaries and venules drained to the small veins directly and vertically.