School of Health, Mersin University, Çiftlikköy Campus, Yenişehir, 33343, Mersin, Turkey.
Department of Anatomy, School of Medicine, Mersin University, Mersin, Turkey.
Surg Radiol Anat. 2020 Aug;42(8):951-960. doi: 10.1007/s00276-020-02498-4. Epub 2020 May 16.
To determine the microsurgical features of the spinal cord and ventral and dorsal rootlets in fetal period.
Twelve formalin-fixed fetuses (six females and six males) with a mean gestational age of 27.0 ± 2.04 weeks (range between 25 and 32 weeks) were dissected to evaluate morphological properties of the spinal cord and rootlets.
Length and width of each spinal cord segment, number of dorsal and ventral rootlets, length of dorsal root entry and ventral root exit zones of each spinal nerve, spinal cord termination level, and the whole spinal cord length were determined in all fetuses. Contrary to previous reports, the number of ventral rootlets was always more than that of dorsal rootlets in all segments. No statistically significant gender difference was found for all parameters. Rootlet number and segment width in cervical region were larger than those of thoracic, while the lengths of dorsal root entry and ventral root exit zones in thoracic region were longer than those of cervical. In lumbar region, dorsal and ventral rootlet numbers were increasing again, while lengths of dorsal root entry and ventral root exit zones were decreasing. Number of dorsal and ventral rootlets of C5 and C6 segments was statistically higher than other cervical segments. The mean spinal cord length was found as 105.55 ± 11.30 mm and there was a positive significant relationship with gestational age. Conus medullaris level was detected between L1 and L3 segments.
Detailed microsurgical data about the fetal spinal cord and the dorsal and ventral rootlets presented in this study provide significant information which may be essential during surgical interventions in early postnatal period and childhood targeting the spinal cord and spinal nerve roots.
确定胎儿期脊髓和腹、背根的显微外科特征。
对 12 例福尔马林固定胎儿（6 名女性，6 名男性）进行解剖，平均胎龄为 27.0±2.04 周（25 至 32 周），以评估脊髓和根的形态特征。
在所有胎儿中确定了每个脊髓节段的长度和宽度、背根和腹根的数量、每个脊神经的背根进入区和腹根出口区的长度、脊髓终止水平和整个脊髓的长度。与以往的报告相反，在所有节段中，腹根的数量总是多于背根。所有参数均未发现性别差异有统计学意义。颈段的根数量和节段宽度大于胸段，而胸段的背根进入区和腹根出口区的长度长于颈段。在腰段，背根和腹根的数量再次增加，而背根进入区和腹根出口区的长度则减少。C5 和 C6 节段的背根和腹根数量明显高于其他颈段。平均脊髓长度为 105.55±11.30mm，与胎龄呈正相关。终丝位于 L1 至 L3 节段之间。
本研究提供了胎儿脊髓和背、腹根的详细显微外科数据，这些数据可能对早期产后和儿童期针对脊髓和脊神经根的手术干预具有重要意义。
