O QUE É UM NEURÔNIO?

Understanding the Brain's Structure and Function

The Composition of the Brain

• Both the heart and brain are made up of cells, but the nervous system cells are unique, contributing to our perception, emotions, and consciousness.

• The brain consists of two main cell types: neurons and glial cells. Glial cells support, protect, nourish neurons, and facilitate their communication.

• Despite glial cells being nearly ten times more numerous than neurons, it raises questions about the myth that we only use 10% of our brains.

Neuron Structure

• A neuron comprises a soma (cell body), axon (information transmitter), and dendrites (signal receivers). Axons can vary significantly in length.

• Synapses are contact points between neurons where signals are transmitted; they consist of a pre-synaptic side (sending signal) and a post-synaptic side (receiving signal).

Signal Transmission Process

• When an electrical impulse reaches an axon's end, neurotransmitters are released to be detected by another neuron's dendrite or soma.

• This detection generates an electrical impulse in the receiving neuron through rapid ion movement across its membrane.

Importance of Myelin Sheath

• Most axons have a myelin sheath made of proteins and lipids that insulates parts of the axon, speeding up electrical impulse transmission.

• Damage to myelin sheaths can lead to conditions like multiple sclerosis, disrupting communication between neurons and affecting cognitive and motor functions.

Continuous Information Processing

• The electrochemical transmission process occurs simultaneously across various regions in the nervous system, enabling coordinated actions throughout the body without conscious effort.