The nervous system comprises of the brain, spinal cord and sensory nerves and it is the most complicated human body system. The Brain is the most complex and delicate organ of the human body. Though it weighs about 1.4 kg, it contains approximately a hundred billion nerve cells. It is made up of three major regions; fore-brain, mid-brain and hind-brain and each region consists of different interdependent parts.
Major Brain Regions
The forebrain is the largest part of the brain which consists of the cerebrum, thalamus, and the hypothalamus. The cerebrum is further divided into two hemispheres, the right hemisphere, and the left hemisphere. The right brain controls the left part of your body and it's where your language and creativity comes from and the left brain controls the right part of your body and is responsible for logic and reasoning.
Thalamus and Hypothalamus
The Thalamus and the Hypothalamus are rather tiny parts of the forebrain yet they play a very vital role. The thalamus is located between the cerebral cortex and the midbrain and plays an important role of relaying the sensory and motor signals to the cerebral cortex. The hypothalamus is a very vital link between the nervous system and the endocrine system.
The midbrain or the mesencephalon is situated behind the frontal lobes and occupies the center of the entire brain. Hearing, vision, body and eye movements are controlled by mid-brain. The mid-brain is again subdivided into three parts called the tectum, tegmentum and cerebral peduncles.
Hindbrain, as the name suggests, is the posterior part of the brain that consists of the cerebellum, pons, and medulla. The hind-brain along with pons and medullas is also known as the brain stem.
Other Brain Regions and Their Functions
The outermost layer of the cerebral hemisphere, also known as the gray matter. It is divided into four lobes each having its specific function. The four lobes are frontal lobes, parietal lobes, temporal lobes, and occipital lobes. The cerebral cortex with all its four lobes is involved in the functions of learning new information, forming thoughts, language processing, making decisions, analyzing sensory data and performing memory functions.
The corpus callosum connects right and left hemisphere and allows communication between the two hemispheres. It also plays an important role in your vision and the movement of your eye. It consists of nearly 200 million axons.
The frontal lobe is responsible for the memory and cognition. It enables you to concentrate and attend, makes you capable of elaboration of thought, judgment, and inhibition. Thus involved in personality development, emotional traits and social and sexual behavior. It also helps voluntary motor activity and motor speech.
It helps in the processing of sensory input, sensory discrimination. Helps in body orientation. It is also the part which helps to judge the shape, size, and distance of an object.
It is concerned with primary visual reception area and primary visual association area which allow visual interpretation.
The temporal lobe rules over auditory receptive area and association areas. It takes care of expressed behavior, receptive speech and information retrieval.
The limbic system manages the olfactory pathways, amygdala and their different pathways, and hippocampi and their different pathways. Limbic lobes control the functions related to sex, rage, fear; emotions. The system is responsible for the integration of recent memory and biological rhythms.
The Basal Ganglia is the subcortical gray matter nuclei which act as processing link between the thalamus and motor cortex. Their functions include initiation and direction of voluntary movement, balance (inhibitory), decision making and planning, postural reflexes, regulation of automatic movement.
The internal capsule can be divided into five parts which are as follows anterior limb, genu, posterior limb, retrolentiform, and sublentiform. It has a dense network of motor and sensory fibers.
Reticular Activating System
The reticular activating system as it says all in its name is responsible for arousal from sleep, wakefulness, and attention.
The pons can be seen as the transmitter as it relays all the message of the upper brain to the lower brain. It has a control over the skin of the face, tongue, teeth, muscle of mastication, the eye muscle which rotates eye outward, facial muscles of expression, internal auditory passage. It plays an important role in the level of arousal or consciousness, and sleep, and is also involved in controlling involuntary body functions.
The medulla oblongata contains the cardiac, respiratory and vasomotor centers and executes the most important function of the brain, that is, regulating our life processes such as breathing, maintaining a steady heart rate and blood pressure, inciting regurgitation (vomiting), swallowing, sneezing, urination, defecation and in coordinating life-saving reflexes.
There are some specially designed brain exercises which you may perform to enhance the power of your brain. A healthy diet, sufficient rest, regular exercise, good eating and sleeping habits play an important role in the health of the brain. Insufficient supply of blood to the brain, even for a few seconds or minutes can destroy the health of several organs.
Disclaimer: This article is for informative purposes only, and should not be used as a replacement for expert medical advice.