原发性脑干出血包括中脑、桥脑与延脑出血,其中以桥脑出血为常见。一、桥脑出血:约占脑出血的10%,其病因多为高血压、动脉硬化,其次为脑血管畸形、先天性动脉瘤等。供应桥脑的血管是由基底动脉干发出的旁中央动脉、短旋动脉及长旋动脉。前者自基底动脉发出后突然变细,其血流方向又与基底动脉相 Primary brainstem hemorrhage, including the midbrain, pons and extension of cerebral hemorrhage, of which pontine hemorrhage is common. First, pontine hemorrhage: about 10% of cerebral hemorrhage, the etiology of mostly hypertension, arteriosclerosis, followed by cerebral vascular malformations, such as congenital aneurysms. The pons supplying the blood vessels are the para-central arteries, the short-spinous arteries, and the long-spinous arteries that originate from the basilar artery. The former suddenly after the basilar artery thinning, the direction of its blood flow and the basilar artery phase