Membrane resistance properties of pineal photoreceptors in the trout
Related Experiment Video
Updated: Jul 9, 2026

Transretinal ERG Recordings from Mouse Retina: Rod and Cone Photoresponses
Published on: March 14, 2012
1Dipartimento di Fisiologia e Biochimica Universita di Pisa, Italy.
Abstract:
Intracellular recordings were obtained from pineal photoreceptors of the trout Salmo irideus. Illumination produced graded hyperpolarizing responses whose time course resembled that of retinal cones in lower vertebrates. Current-voltage relations were derived by using a voltage-clamp technique in the dark and during illumination. Membrane resistance values obtained in the dark were about 550 M omega, and they increased during illumination. The extrapolated reversal potential of the photocurrent is about 55 mV above the dark membrane potential, indicating that an ionic mechanism similar to that in retinal photoreceptors may be involved.
Related Concept Videos
Resting Membrane Potential
The Inside of a Neuron is More Negative
The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular fluid. The...
Channel Rhodopsins
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
G-Protein Gated Ion Channels
Sensory organs,...
Photoreceptors and Visual Pathways
The Pineal Gland
The primary secretion of the pineal gland is the hormone melatonin, derived from serotonin. The concentration of melatonin in the...

