Introduction to the nervous system Central vs. peripheral nervous system▪ Autonomic vs. somatic nervous system

Components of the nervous system Glia Neuron▪ Parts of a neuron

Action potential

CENTRAL NERVOUS SYSTEM PERIPHERAL NERVOUS SYSTEM

The Autonomic Nervous System (ANS) can be divided into:

Sympathetic Nervous System “Fight or Flight”

Parasympathetic Nervous System “Rest and Digest”

NEURON GLIA

Basic building blocks of the brain

Parts of the Neuron Dendrites Soma (Cell Body) Axon Axon Terminal

What do dendrites respond to?

How do dendrites respond?

Contains the nucleus of the neuron

Receives information from dendrites

Conducts information

Can vary in length

Afferent vs. efferent axon

Myelin Sheath

Nodes of Ranvier

Where information is released

Termination of the action potential which may lead to the release of a neurotransmitter

After the electrical impulse reaches the axon terminal, this information may be passed onto the next neuron.

Neurons contain 2 types of receptors Excitatory Inhibitory

A nerve impulse is the electrical message that is transmitted down the axon of a neuron.

Conducting an electrical impulse or action potential means conducting information within a neuron.

Resting Membrane Potential (-70mV) K+, Na+, Ca2+, Cl- Inside vs. outside of the membrane

Selective Permeability

Electrical Gradient vs. Chemical Gradient

Voltage-gated vs. Ligand-gated Ion Channels

The all-or-none law states that the amplitude and velocity of an action potential are independent of the intensity of the stimulus that initiated it. Action potentials are equal in intensity and

speed within a given neuron.