6. 척수신경 세근의 분절간 문합변이는 후근에서 14.4%, 전근에서 6.9% 전체적으로 10.7%의 빈도를 나타내었다. 문합의 유형은 연합문합(78.8%), 평행문합(12/0%), 재배열문합(9.2)의 순서로 관찰되었다. 문합변이의 빈도가 가장 높았던 곳은 제5요신경근과 제1천신경근 사이였다.
7. 척수신경의 전근과 후근간의 문합은 전체 조사수 100예 중에 4예(4%)에서 관찰되었는데, 오른쪽에서 3예 왼쪽에서 1예 관찰되었다.
[영문]
A morphological study of the lumbosacral nerve root of Korean adults was done using 100 spinal cords and its meningeal coverings. For clinical purposes, morphologic variations of spinal nerve root and that of spinal nerve rootlet were observed. And interroot space and number of spinal nerve rootlet were assessed for anatomical basis of surgical applications.
The results of the study are as follows;
1. The morphologic variations of lumbosacral nerve root was noted 5.6% of cases studied. Noted morphologic variations were conjoined nerve root, cranial origin and extradural anastomosis.
2. The lumbosacral interroot length was measured with interval between second lumbar nerve root and third lumbar root being longest.
3. The lumbosacral nerve roots were composed of 1-5 rootlet in posterior root and 1-2 in anterior root.
4. The aberrant root of lumbosacral nerve root was noted in 17.7% of cases.
5. The intersegmental variations of lumbosacral nerve rootlet composed of rootlet division and supernumerary root were noted in 1.3% of cases.
6. The intersegmental variations of lumbosacral nerve rootlet was noted in 10.7% of cases and classied into 3 types by shape with union anastomosis (78.8%) being the most frequent.
7. The anterior to posterior anastomosis of lumbosacral nerve rootlet were noted in 4% of cases.