例1,女,30岁,农民。1983年某日因制止吵架被人抓住辫子撕打,在挣脱中突然倒地死亡。死后18小时尸检。死者发育良好,体健,双辫长40cm,头部无损伤及血肿,双侧瞳孔等大0.6cm,右侧鼻根部、右耳前,左嘴外皮肤上有指甲擦划伤痕,胸、腹、内脏、颅腔无异常。从背侧解剖颈部见枕骨大孔下肌内组织有一1.5×2cm 的紫黑色血,第一颈椎和第二颈椎之间的枢环后膜,十字韧带已撕开,环枢关节 Example 1, female, 30 years old, farmer. One day in 1983 to stop quarrel was grabbed braids torn, suddenly fell to the ground in the break free from death. 18 hours after death autopsy. The deceased developed well, body health, double braid length 40cm, head injury and hematoma, bilateral pupil and other large 0.6cm, the right nasal root, right ear, left mouth outside the skin nails scratch scratches, chest, abdomen , Visceral, cranial cavity without exception. Anatomy of the neck from the dorsal see the foramen magnum below the muscle tissue has a purple dark blood 1.5 × 2cm, the first cervical vertebra and second cervical vertebra after the posterior membrane, the cruciate ligament has been torn, the Central Axis