Allen G I, Korn H, Oshima T, Toyama K
Exp Brain Res. 1975 Nov 28;24(1):15-36. doi: 10.1007/BF00236015.
Extracellular and intracellular recordings were made from single cells in the pontine nuclei (PN) of the cat. PN cells were identified by antidromic invasion from the cerebellum by stimulating either the brachium pontis (BP) or the white matter near the cerebellar nuclei. The cerebrally-induced impulses excited PN cells postsynaptically with a monosynaptic latency. Both fast and slow conducting cortical fibres contributed to the corticopontine excitation, so that the latency varied over a wide range. Measurements of the latencies for antidromic and corticopontine excitation and of the distances between stimulated sites permitted the calcuation of conduction velocities of PN cell axons and of their cortical input fibres. PN cells with fast conducting axons received convergence from both fast and slow cortical fibres, whereas PN cells with slow axons were innervated only by slow cortical fibres. The majority of PN cells were also excited by stimulating the medullary pyramid through collaterals of the pyramidal tract. Evidence of abundant pyramidal collaterals was provided by the collision technique. The functional role of the PN is discussed in connection with the cerebro-cerebellar loop circuits.
在猫的脑桥核（PN）中对单个细胞进行了细胞外和细胞内记录。通过刺激脑桥臂（BP）或小脑核附近的白质，从大脑皮层逆向传入冲动来识别PN细胞。大脑皮层诱发的冲动以单突触潜伏期在突触后兴奋PN细胞。快速和慢速传导的皮层纤维都参与了皮质脑桥兴奋，因此潜伏期变化范围很广。通过测量逆向和皮质脑桥兴奋的潜伏期以及刺激部位之间的距离，可以计算PN细胞轴突及其皮层输入纤维的传导速度。轴突传导速度快的PN细胞接受快速和慢速皮层纤维的汇聚，而轴突传导速度慢的PN细胞仅由慢速皮层纤维支配。大多数PN细胞也通过锥体束的侧支刺激延髓锥体而被兴奋。碰撞技术提供了丰富锥体束侧支的证据。结合脑-小脑环路讨论了PN的功能作用。
