Electrical interaction between muscle layers of cat intestine

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Abstract
Spontaneous slow waves recorded by pressure or microelectrodes from longitudinal muscle of intact jejunal segments are conducted in the long axis at 10 mm/sec. Spikes may occur locally at slow-wave peaks. Around the ring, slow waves are virtually synchronous. Records from circular fibers at the ends of cut longitudinal muscles or at the side of a longitudinal strip in a flat sheet show slow waves spreading electrotonically from longitudinal to circular with 50% decline in 1-2 mm. In intestinal cylinders, circular fibers alongside a strip of longitudinal muscle show slow waves which conduct at 80 mm/sec, and have little decrement (50% decline in 7 mm). Spikes pass in both directions between the layers. Delay for spikes and slow waves is 100-150 msec. Muscle strands connect the layers and when these are cut, interlayer conduction ceases. Ganglionic blocking drugs or cold storage do not affect interlayer conduction or transverse synchrony. Excitability of circular muscle with slow waves is reduced. Transverse segmental synchrony may result from recurrent reinforcement between the two layers.

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