The nervous system is important in the body as it helps in maintaining homeostasis or balance of the body. It includes a complex of specializing nerve cells called the neurons, which take part in the coordination of different bodily activities. Although there are several organs and systems related to the nervous system, most of them revolve around the proper functioning of the brain. The nervous system of the human is of two types: the central nervous system (CNS) and peripheral nervous system (PNS). The central nervous system’s major components are the brain and the spinal cord. The peripheral nervous system is made up of the sensory and motor neurons. The sensory neurons are responsible for carrying signals from the sensory organs to the CNS while the motor neurons are involved in carrying signals from CNS to different body parts. Further, the motor neurons can be classified into two types namely the somatic and autonomic nervous systems. The somatic nervous system is involved in controlling the body’s voluntary movements while the autonomic nervous system is involved in involuntary responses occurring inside the body. The ANS further is classified into two types namely the sympathetic system and the parasympathetic system, which take part in flight or fright response and rest response respectively. The brain is the central organ and remains safe inside the skull. During evolution, the evolution of the brain has several significant variations resulting in its different sizes and structure in various animals. However, the muscular nature of the brain remains the same in most animals.
Neurons, also known as nerve cells are the fundamental unit of the brain and nervous system. They are electrically excitable cells that aid in communication with neighboring cells through special junctions known as synapses. Neurons play a key role in signal transmission from the sense organs to the nervous system (sensory neurons) and from the nervous system to the corresponding sensory organs (motor neurons). The neuron’s structure includes the soma, the dendrites, and an axon. The soma is the compact body from which axons and dendrites extend it. At the axonal end are the axon terminals through which an axon communicates with the neighboring neuron. The communication of one neuron with its neighboring neuron is essential for the transmission of signals. Often, the axon of a neuron is in contact with the dendrite of another neuron at a specific site called the synapses
Brain development
During embryonic development, the brain grows at an amazing rate. Approximately, about 2,00,000 neurons are added every minute and during birth, the brain of the person has about all the neurons that will be present in his entire life. Further, the brain also continues to grow after birth for a few years. About 80% of human brain development is completed when the person is just 2 years old. The reason for the growth of the brain although all the neurons have grown is due to the growth of glial cells. Glial cells are another set of important cells in the nervous system apart from the neurons and they carry out many essential physiological activities in the nervous system like insulating the neurons, protecting them, removing waste, and also providing nutrients. The ectoderm is the embryonic tissue that forms the nervous tissue and the appearance of the neural plate (during the 16th day in humans) is the first sign of the nervous system in many animals. This is followed by the formation of a trench in the neural plate, which is known as the neural groove. After 21 days, the neural grooves meet at a specific point, which forms the neural tube. The brain is formed from the neural tube’s front part while the remaining neural tube produces the spinal cord. PNS is formed from the neural crest. Encephalization occurs by the 7th week and during this process, three major brain areas namely the forebrain, midbrain, and hindbrain develop.
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