Number of Brain Cells in a Human Brain
Human brain contains approximately 86 billion neurons. These neurons are the basic building blocks of the nervous system and are responsible for transmitting information throughout the brain and body.

Types of Brain Cells
1. Neurons: Neurons are specialized cells that transmit electrical and chemical signals in the brain. They are responsible for processing and transmitting information.
2. Glial cells: Glial cells provide support and protection for neurons. They also play a role in maintaining the brain's environment and insulating neurons.
3. Astrocytes: Astrocytes are a type of glial cell that help regulate the chemical environment around neurons and provide nutrients to them.
4. Oligodendrocytes: Oligodendrocytes produce myelin, a fatty substance that insulates neurons and helps speed up the transmission of electrical signals.

Function of Brain Cells
- Neurons are responsible for processing information, forming memories, and controlling movements.
- Glial cells provide support and protection for neurons, allowing them to function properly.
- Astrocytes help regulate the chemical environment in the brain and provide nutrients to neurons.
- Oligodendrocytes produce myelin, which helps speed up the transmission of electrical signals.
In conclusion, the human brain contains approximately 86 billion brain cells, including neurons and various types of glial cells. These cells work together to enable the brain to function properly and carry out essential cognitive and motor functions.