胎儿脊髓脊柱发育的观察

用１９３例正常胎儿尸体观察测量了脊髓的全长、重量，体积，颈膨大，腰骶膨大及终丝等方面出生前的逐月发育值及的变化。在４个月时脊髓已脱离了骶管；出生时脊髓下端位于腰２￣腰３椎体间高度；硬脊膜囊下界位于骶１￣骶２椎体间高度；外终丝止点基本在尾１￣尾２椎体间；脊髓长与身长之比逐月下降，至出生前约为１／３；脊髓重与体重之比始终保持在０．１％左右，脊髓发的性别差异不明显。上述结果可为教学及临床提供基本的参考数

OBSERVATION ON DEVELOPMENT OF SPINAL CORD AND VERTEBRAL COLUMN

The spinal cords of 193 normal fetal cadavers were observed and measured to obtain the average value of overall length, weight, volume, cervical enlargement, lumbosacral enlargement and the terminal filum of spinal cord before birth. The spinal cord was separated from the sacral 1 months after pregnancy. The position of inferior extremity of conns medullaris corresponded with the 2nd to the 3rd lumbar vertebrae, the position of the inferior limit of spinal dura mater capsule corresponded with the 1st to the 2nd sacral vertebrae by the end of pregnancy. The lower end of external terminal filum set in position, approximating to the dorsal surface of the 1st and 2nd coccygeal vertebral bodies. The ratio of the spinal cord length to the body's length went down every month of pregnancy, and at birth the ratio was approximately 1 : 3. The ratio of the spinal cord weight to the body weight maintained in the vicinity of 0. 1 per cent. The sexual difference in the development of spinal cord was not obvious. The findings would be used as a basic reference for teaching as well as clinical practice.