Epistaxis or nasal bleeding commonly occurs at the junction of the internal carotid artery derivatives and the external carotid artery derivatives.It is usually described as anterior or posterior bleeding.

指前鼻孔出血和后鼻孔出血。

anterior
an.te.ri.or
AHD:[²n-tîr“¶-…r]
D.J.[#n6t!*ri8*]
K.K.[#n6t!ri+]
adj.Abbr. a.（形容词）缩写 a.
Placed before or in front.
前面的：位于前部的，前面的
Occurring before in time; earlier.
先前的：时间上先发生的；较早的
Anatomy
【解剖学】
Located near or toward the head in lower animals.
头部附近的：位于或朝着低级动物头部附近的
Located on or near the front of the body in higher animals.
身体附近的，身体前部的：位于高级动物身体附近或前部的
Located on or near the front of an organ or on the ventral surface of the body in human beings.
人体器官的，人体器官附近的，人体前侧面的：位于人体某器官或附近的，或在人体前侧面的
Botany In front of and facing away from the axis or stem.
【植物学】 茎干前部的：在茎或干前部且背向茎干的


参考文献：金山词霸2007