Differential chemosensitivity of synaptic and extrasynaptic areas on the neuronal surface membrane in parasympathetic neurons of the frog, tested by microapplication of acetylcholine
- 27 April 1971
- journal article
- Published by The Royal Society in Proceedings of the Royal Society of London. B. Biological Sciences
- Vol. 177 (1049), 541-553
- https://doi.org/10.1098/rspb.1971.0046
Abstract
1. The chemosensitivity of the surface of parasympathetic neurons in the interatrial septum of the heart of the frog has been explored by focal iontophoretic application of acetylcholine (ACh). 2. There is a specific highly chemosensitive area on the cell surface near synaptic boutons. ACh released close to visually identified boutons produced depolarizing responses which arise more rapidly and are larger than responses evoked at randomly chosen spots on the neuronal surface. 3. Individual synapses, or small numbers of them, can be desensitized by applied ACh without blocking synaptic transmission at nearby synapses on the same neuron. This shows that the method of ACh application resolves chemosensitivity in patches restricted to a few micrometres in diameter.Keywords
This publication has 16 references indexed in Scilit:
- Visual identification of synaptic boutons on living ganglion cells and of varicosities in postganglionic axons in the heart of the frogProceedings of the Royal Society of London. B. Biological Sciences, 1971
- The development of chemosensitivity in extrasynaptic areas of the neuronal surface after denervation of parasympathetic ganglion cells in the heart of the frogProceedings of the Royal Society of London. B. Biological Sciences, 1971
- Synaptic transmission and its duplication by focally applied acetylcholine in parasympathetic neurons in the heart of the frogProceedings of the Royal Society of London. B. Biological Sciences, 1971
- Acetylcholine Sensitivity and Distribution on Mouse Neuroblastoma CellsScience, 1970
- Iontophoretic application of acetylcholine and gaba onto insect central neuronesComparative Biochemistry and Physiology, 1969
- JUNCTIONS BETWEEN INTIMATELY APPOSED CELL MEMBRANES IN THE VERTEBRATE BRAINThe Journal of cell biology, 1969
- An electrophysiological study of 5‐hydroxytryptamine receptors of neurones in the molluscan nervous systemThe Journal of Physiology, 1966
- On the localization of acetylcholine receptorsThe Journal of Physiology, 1955
- SPECIFIC EXCITABILITY OF THE ENDPLATE REGION IN NORMAL AND DENERVATED MUSCLEJournal of Neurophysiology, 1943
- On the contraction of muscle, chiefly in relation to the presence of ‘receptive’ substancesThe Journal of Physiology, 1907