Initial segment

Definition

The initial segment is the part of a neuron where the axon originates from the axon hillock and is crucial for initiating nerve signals. It plays a pivotal role in determining whether or not the neuron will fire an action potential based on the summation of inhibitory and excitatory signals received.

Related terms

Axon Hillock: The cone-shaped region of a neuron's cell body that connects to the axon and plays a key role in generating action potentials.

Action Potential: A rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane, essentially conveying information along neurons.

Nerve Signal: An electrical impulse that travels along neurons, facilitating communication within the nervous system.