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The Brain

Side view of head and brain.
Some body functions are controlled by just 1 part of the brain. Other functions are controlled by more than 1 part.
The brain controls the entire body. The main areas of the brain include the cerebrum, cerebellum, forebrain, and brain stem. The cerebrum is divided into 2 halves that have 4 parts, called lobes. The 4 lobes are the frontal lobe, temporal lobe, parietal lobe, and occipital lobe. Different areas of the brain have different functions. Some parts of the brain control basic functions. These include breathing, blood pressure, and heartbeat. Other parts control more complex functions, such as moving, thinking, speaking, the 5 senses, and memory.

Inside the skull

Under the scalp and the skull, a tough membrane (the dura) surrounds the brain. Beneath the dura, cerebrospinal fluid (CSF) cushions the brain and circulates in the subarachnoid space. Arteries carry nutrients and oxygen-rich blood throughout the brain. Without this blood, brain tissue quickly dies. The brain is made up of about 100 billion cells called neurons. These neurons allow the brain to do its many functions.


Not pictured here is the forebrain. This part of the brain contains the thalamus, hypothalamus, and pituitary gland. The thalamus sends impulses from the sense organs to the cortex. The hypothalamus controls hunger, thirst, temperature, aggression, and sex drive. It also controls the pituitary gland, which controls the secretion of many hormones.

Online Medical Reviewer: Hanrahan, John, MD
Online Medical Reviewer: Jasmin, Luc, MD
Date Last Reviewed: 1/1/2018
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