颌面高速投射物伤时颅脑间接损伤的病理特点

本实验以高、中速钢球致伤犬下面部，结果发现：（1）颌面投射物在不同可同时伴有颅脑间接损伤，脑挫伤及颅底硬膜外出血是其主要表现，高速钢球致下颌骨折者损伤发生率最高，程度最重；（2）脑挫伤好发于入射侧颞下回，颅底硬膜外出血常见于入射侧岩部附近；（3）组织吸收能量越多，局部伤情越严重，头颅振动加速度值越大，颅脑损伤发生率越高，程度愈严重。

The pathogical characteritics and mechanism of craniocerebral injuries concomitant with high-velocity missile wound of max-illofacial region

Forty-five healthy male dogs were wounded with high or middle-velocity steel ball on the lower part of the face.and the findings were as follows:(1)Craniocerebral injuries concomitant with maxillofacial gunshot wounds were charcterized by brain contusion in the entry side of the temporal lobe and extradural hemorrhage in the entry side of the middle cranial fossa,and their highest incidence and severity were found in those cases with mandible fracture due to high-velocity missiles.(2)The larger the amount of the absorbed energy from the bullet,the higher the incidence and severity of the craniocerebral injury.(3)The incidence and severity of the craniocerebral injury were positively correlated to the value of vibrational acceleration measured on the pareital bones,which suggests that vibrational acceleration plays an important role in the precipitation of craniocerebral injury secondary to maxillofacial gunshot wounds.