Wilson J W
Am J Vet Res. 1978 Nov;39(11):1774-7.
The lumbosacral plexuses of dogs were exposed, using a ventral abdominal approach. In 4 dogs, the ventral branches (VB) of the 4th, 5th, 6th, or 7th lumbar spinal nerves were severed bilaterally. In 4 other dogs, the VB of combinations of 3 of these lumbar spinal nerves were severed so that the branch of only 1 nerve was kept intact. Among many neurologic deficits seen, the reflex of the patellar tendon was absent if the VB of the 5th lumbar spinal nerve was severed and was present if the branch was left intact. This finding was confirmed in another 12 dogs in which the VG of the 5th lumbar spinal nerve was severed on 1 side and the VB of the 4th and 6th lumbar spinal nerves were severed on the opposite side. In 4 additional dogs, the dorsal and ventral roots of the 5th lumbar spinal cord segment were isolated by dorsal laminectomy. Severing the dorsal root caused loss of the patellar tendon reflex, whereas severing the ventral root resulted in hyporeflexia. These findings would suggest that the major afferent impulse elicited by tapping the patellar tendon reaches the spinal cord by way of the dorsal root of the 5th lumbar spinal nerve.
采用腹侧腹部入路暴露犬的腰骶丛。在4只犬中，双侧切断第4、5、6或7腰脊髓神经的腹侧支（VB）。在另外4只犬中，切断这些腰脊髓神经中3条神经组合的VB，仅保留1条神经的分支完整。在观察到的许多神经功能缺损中，如果切断第5腰脊髓神经的VB，髌腱反射消失；如果该分支完整保留，则髌腱反射存在。这一发现在另外12只犬中得到证实，其中一侧切断第5腰脊髓神经的VG，另一侧切断第4和6腰脊髓神经的VB。在另外4只犬中，通过背侧椎板切除术分离第5腰脊髓节段的背根和腹根。切断背根导致髌腱反射消失，而切断腹根则导致反射减弱。这些发现表明，轻敲髌腱引发的主要传入冲动通过第5腰脊髓神经的背根到达脊髓。
