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Updated: Oct 6, 2026

Physiological Recordings of High and Low Output NMJs on the Crayfish Leg Extensor Muscle
Published on: November 17, 2010
Steroids modulate the excitability of crayfish (Procambarus digueti) photoreceptors: long- and short-term actions
J Hernández-Falcón1, O Schneider-Ehrenberg, A De la O Martínez
1Facultad de Medicina, U.N.A.M., México, D.F., 04510, Mexico.
Abstract:
Short- and long-term actions of the steroids corticosterone, progesterone, and ecdysterone were analyzed upon excitability of crayfish retinular cells. The three hormones showed short-term actions, particularly during photoreceptor dark adaptation; effects were found to be dependent on the hour of the day. Corticosterone and progesterone had similar effects, i.e., resembled dark-adapted conditions; ecdysterone actions were opposite and resembled light adaptation. Long-term effects were opposed to short-term effects in all cases. Possible mechanisms underlying these effects are discussed.
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