PMID: 2487084Jan 1, 1989Paper

Signal integration at the pedicle of turtle cone photoreceptors: an anatomical and electrophysiological study

Visual Neuroscience
E M LasaterH Kolb

Abstract

The morphology of the axon which connects the cell body and pedicle of turtle cone photoreceptors was studied by light and electron microscopy. The axon which contains numerous synaptic vesicles, some endoplasmic reticulum, and a few cisternae is basically filled with cytoplasm. The length of the axon is related to the class of cone and varies slightly with retinal location, with axons as short as 3-6 microns found in red cones, and as long as 60 microns in cones containing colorless oil droplets. By simultaneously voltage clamping the cell body and pedicle regions of single isolated cones, we measured the longitudinal axonal resistance and the cell body and pedicle membrane resistances. For each cell studied, the axonal resistance of cones with short axons was lower than the cell and pedicle membrane resistances. Thus, the cell can be considered to be an isopotential structure. However, in some cones with long axons, the axonal, cell body, and pedicle resistances were comparable. The pedicles of these cones, therefore, could act like summing points and may provide a locus for spatial signal integration. Electrical coupling between the principal and accessory members of double cones was also studied. Electron-microscopic observ...Continue Reading

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Citations

May 6, 2005·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Katalin RablWallace B Thoreson
Jul 16, 2002·Vision Research·A HsuP Sterling
Mar 9, 2000·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·A HsuP Sterling
Feb 24, 2006·Biological cybernetics·Peter König, Norbert Krüger
Jul 13, 2019·Postgraduate Medical Journal·Ashley Laurence Bharat RaghuAlexander Laurence Green

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