WATANABE A, GRUNDFEST H
J Gen Physiol. 1961 Nov;45(2):267-308. doi: 10.1085/jgp.45.2.267.
Transmission across the septal junctions of the segmented giant axons of crayfish is accounted for quantitatively by a simple equivalent circuit. The septal membranes are passive, resistive components and transmission is ephaptic, by the electrotonic spread of the action current of the pre-septal spike. The electrotonic spread appears as a septal potential, considerably smaller than the pre-septal spike, but usually still large enough to initiate a new spike in the post-septal segments. The septal membranes do not exhibit rectification, at least over a range of +/- 25 mv polarization and this accounts for their capacity for bidirectional transmission. The commissural branches, which are put forth by each lateral axon, make functional connections between the two axons. Transmission across these junctions can also be bidirectional and is probably also ephaptic. Under various conditions, the ladder-like network of cross-connections formed by the commissural junctions can give rise to circus propagation of impulses from one axon to the other. This can give rise to reverberatory activity of both axons at frequencies as high as 400/sec.
小龙虾有节段的巨轴突的隔膜连接处的信号传递，可以通过一个简单的等效电路进行定量解释。隔膜膜是被动的电阻性元件，信号传递是电紧张性的，通过隔膜前尖峰动作电流的电紧张性扩布来实现。电紧张性扩布表现为隔膜电位，比隔膜前尖峰小得多，但通常仍大到足以在隔膜后节段引发新的尖峰。隔膜膜至少在±25毫伏的极化范围内不表现出整流作用，这解释了它们双向传递信号的能力。每个侧轴突发出的连合支在两个轴突之间建立功能连接。通过这些连接处的信号传递也可以是双向的，并且可能也是电紧张性的。在各种条件下，由连合连接形成的梯子状交叉连接网络可以引起冲动从一个轴突向另一个轴突的环形传播。这可以导致两个轴突以高达400次/秒的频率产生回响活动。
