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Intracellular recording from the myenteric plexus of the guinea‐pig ileum

Intracellular recording from the myenteric plexus of the guinea‐pig ileum 1. Ganglion cells of the myenteric plexus of the guinea‐pig ileum have been studied with intracellular micro‐electrodes. 2. Three types of cell were distinguished. Type 1 cells had a high resistance (58 MΩ) and had properties similar to guinea‐pig sympathetic ganglion cells. Type 2 cells were also excitable but had a lower resistance (21 MΩ) and showed accommodation to depolarizing current pulses. Type 3 cells were inexcitable. 3. Point stimulation within 150 μm excited neurones either antidromically or orthodromically, sometimes both. 4. Antidromic responses had a small all‐or‐nothing component which was subthreshold for the soma spike. Two or more such components sometimes occurred, and were probably due to stimulation of two or more cell processes. 5. Excitatory post‐synaptic potentials (e.p.s.p.s) were blocked by hexamethonium (400 μ M). They progressively declined in amplitude when elicited at frequencies of 0·05 Hz or more, and this is discussed in relation to studies on acetylcholine (ACh) output. 6. Many cells often showed a slow after‐hyperpolarization following a direct or antidromic spike. Its mechanism and significance are discussed. 7. Spontaneous e.p.s.p.s and spikes were occasionally seen. 8. Intracellular injection of a fluorescent dye reveals that the neurones have one to seven processes, which usually arise from the poles of the oval soma. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Physiology Wiley

Intracellular recording from the myenteric plexus of the guinea‐pig ileum

Nishi, S.; North, R. A.
The Journal of Physiology , Volume 231 (3) – Jun 1, 1973
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References (37)

Publisher
Wiley
Copyright
© 2014 The Physiological Society
ISSN
0022-3751
eISSN
1469-7793
DOI
10.1113/jphysiol.1973.sp010244
Publisher site
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Abstract

1. Ganglion cells of the myenteric plexus of the guinea‐pig ileum have been studied with intracellular micro‐electrodes. 2. Three types of cell were distinguished. Type 1 cells had a high resistance (58 MΩ) and had properties similar to guinea‐pig sympathetic ganglion cells. Type 2 cells were also excitable but had a lower resistance (21 MΩ) and showed accommodation to depolarizing current pulses. Type 3 cells were inexcitable. 3. Point stimulation within 150 μm excited neurones either antidromically or orthodromically, sometimes both. 4. Antidromic responses had a small all‐or‐nothing component which was subthreshold for the soma spike. Two or more such components sometimes occurred, and were probably due to stimulation of two or more cell processes. 5. Excitatory post‐synaptic potentials (e.p.s.p.s) were blocked by hexamethonium (400 μ M). They progressively declined in amplitude when elicited at frequencies of 0·05 Hz or more, and this is discussed in relation to studies on acetylcholine (ACh) output. 6. Many cells often showed a slow after‐hyperpolarization following a direct or antidromic spike. Its mechanism and significance are discussed. 7. Spontaneous e.p.s.p.s and spikes were occasionally seen. 8. Intracellular injection of a fluorescent dye reveals that the neurones have one to seven processes, which usually arise from the poles of the oval soma.

Journal

The Journal of Physiology – Wiley

Published: Jun 1, 1973

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