Tag: nerve excitability

November 3, 2025 / Mohammed looti

POSITIVE AFTERPOTENTIAL

Defining the Positive Afterpotential The Positive Afterpotential (PAP), also referred to in some contexts as the after-depolarization or the period following the hyperpolarizing undershoot, represents a crucial phase in the recovery cycle of an excitable cell, typically a neuron or a muscle fiber, immediately following the conclusion of an action potential spike. It is characterized […]

November 2, 2025 / Mohammed looti

CATELECTROTONUS

Introduction and Definition of Catelectrotonus The term Catelectrotonus refers to a fundamental physiological phenomenon observed in excitable tissues, such as nerves and muscles, when subjected to the passage of a direct electrical current. Specifically, it describes the state of increased excitability or irritability that develops in the region immediately adjacent to the cathode, which is […]