You Have Some Nerve

Dendrites

Cell

Axon

Axon Terminals

Myelin Sheath

Nucleus

Neuron – long, thin cells of nerve tissue that transfer messages to and from the brain

Axon – aka “nerve fiber,” transfer the electrical impulses away from cell body

Dendrite – short, branch-like extension of the nerve cell that receive impulses from other cells

Myelin sheath – Casing of electrically insulated protection around the axon

Axon Terminal – small projection from the nerve cell that sends out information to other cells

Synapse

Synapse – a small gap between one cell’s axon terminal and another cell’s dendrite through which the electrical impulses that pass through the brain are passed

SynapsesConsist of 3 Parts: 1. Presynaptic ending – made up of neurotransmitters

at the Axon Terminal that transmit information2. Postsynaptic ending – made up of receptor sites

that receive the information in the Dendrites3. Synaptic Gap – small gap between the Axon

Terminal and the Dendrite through which the electrical impulses are transmitted

Presynaptic Neuron

Lots of chemical activity

Post Synaptic Neuron

NeurotransmittersKind of boring, but it will help this make a little bit more sense

https://www.youtube.com/watch?v=p5zFgT4aofA

Th Action Potential

Action PotentialAction Potential – the explosion of electrical impulse that fires down the axon away from the cell body and to the neurotransmitters

Th Action Potential

Th Action Potential

Th Action Potential

Th Action Potential

Axon Terminals

Dendrites

Axon Terminals

DendritesNeurotransmitter

Receptor

TerminalButtons

Dendrites

Neurotransmitter

Receptor

TerminalButtons

DendritesExcitatory: Continue the action potential

AxonTerminals

Dendrites

Inhibitory: End the action potential

A Good Explanation of Neurotransmittershttps://www.youtube.com/watch?v=ukFjH9odsXw

Both kinds received at once

Excitatory has to pass a certain threshold to create an Action potential

Excitatory or Inhibitory?

Neurotransmitters

AcetylcholinePresent in the synapses in the nerves at our muscles.

More Acetycholine in the synapse: Binds with receptors at the dendrite to effect an action potential, and thus, create muscle movement

Less acetylcholine in the synapse: no action potentials...no muscle movement

Neurotransmitters

BOTOX

BOTOX

Inhibits

Acetylcholine

Acetylcholine is the

neurotransmitter, which, when

abundant in our muscle synapses,

control muscle movement

BOTOX

keeps acetylcholine out of the synapse

So the muscles that cause

wrinkles are temporarily paralyzed