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门静脉和一般静脉不同,一般静脉由许多小静脉会成一主干后,不再进行分支,而门静脉却是两端都有毛细血管的静脉干。 人体门静脉有两处;肝门静脉和脑垂体门静脉,关于肝门静脉在《生物学教学》1993年第11期已有文章介绍,这里仅谈一下垂体门静脉。 垂体呈椭圆形,位于颅腔底部蝶骨鞍内（即颅中窝,交叉前沟后方的垂体窝内）,借漏斗连于下丘,故名脑垂体或脑下垂体,垂体中根据其发生和结构功能特点不同可分为腺垂体、神经垂体两部。腺垂体包括前部、结节部、中间部三部分。神经垂体分后部（神经部）、
The portal vein and the general vein is different, the general vein by many small veins will become a trunk, no longer branch, but the portal vein is capillaries at both ends of the vein. The human portal vein has two; portal vein and pituitary portal vein, about the portal vein in the “biology teaching” in 1993 the eleventh article has been introduced, here only talk about the pituitary portal vein. Pituitary was oval, located in the cranial cavity at the bottom of the sphenoid saddle (ie, cranial fossa, anterior pituitary fossa behind the cross before the ditch), by the funnel attached to the inferior colliculus, hence the name pituitary or pituitary gland, pituitary according to its occurrence and Structure and function can be divided into different pituitary gland, pituitary two. Pituitary gland including the anterior, nodular, middle part of the three parts. Nerve pituitary sub-posterior (nerve),