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The brain is arguably the most important organ in the human body. It controls and coordinates actions and reactions, allows us to think and feel, and enables us to have memories and feelings – all the things that make us human.
While the brain only weighs about 3 pounds, it is a highly complex organ made up of many parts. Years of scientific study of the brain have made it possible for scientists to identify the various areas of the brain and determine their specific functions. The following information gives a brief description of some of the major parts of the human brain.
The brain is protected by a bony covering called the cranium (which, along with the bones of the face, make up the skull). Inside the cranium, the brain is surrounded by the meninges. The meninges is made up of 3 layers of tissue:
The cerebrum – the front of the brain
The largest part of the brain located in the front is called the cerebrum. The cerebrum is responsible for:
The cerebrum has 2 parts: the right cerebral hemisphere and the left cerebral hemisphere. They are connected at the bottom and have a deep groove running between them. In general, the right cerebral hemisphere controls the left side of the body, and the left cerebral hemisphere controls the right. The right side is involved with creativity and artistic abilities. The left side is important for logic and rational thinking.
The hemispheres of the cerebrum are divided into lobes, or broad regions of the brain. Each lobe is responsible for a variety of bodily functions:
The surface of the cerebrum appears wrinkled and is made up of deep grooves (called sulci) and bumps or folds (called gyri). The outer part of the cerebrum is called gray matter and contains nerve cells. The inner part is called white matter and contains connections of nerves.
The brainstem – the middle of the brain
The brainstem is located in front of the cerebellum. The brainstem is like the hard-drive of a computer. It is the main control panel for the body that passes messages back and forth between the brain and other parts of the body. The cerebrum, the cerebellum, and the spinal cord are all connected to the brainstem. The brainstem has three main parts, the midbrain, the pons, and the medulla oblongata.
The brain stem controls vital functions of the body, including:
The cerebellum – the back of the brain
Behind the cerebrum at the back of the head is the cerebellum. In Latin, cerebellum means “little brain.” However, the cerebellum contains more nerve cells than both hemispheres combined. The cerebellum is primarily a movement control center, responsible for:
Unlike the cerebrum, the left cerebellum controls the left side of the body, and the right cerebellum controls the right side of the body.
Other important parts of the brain
The brain is not a solid organ. There are fluid-filled cavities within the brain called ventricles. The ventricles are important in providing nourishment to the brain. The ventricular system produces and processes cerebrospinal fluid – a clear, watery substance that flows around the brain and helps cushion and protect it.
The brain also contains 12 pairs of cranial nerves each responsible for specific functions in the body:
The pituitary gland is located in the center of the brain and is about the size of a dime. The pituitary gland, often referred to as the “master gland of the body,” is responsible for a number of functions including producing hormones for the thyroid and adrenal glands, as well as the hormones responsible for normal growth and sexual maturation.
LastUpdate: 2016-06-03 09:17:09