![]() These synaptic vesicles contain neurotransmitters.The synaptic knob has synaptic vesicles.A bulb-like structure is present at the end of each branch, which is called synaptic knob.It is a long fibre and has a branched distal end.It is also the cytoplasmic extensions of the cell body.Dendrites receive nerve impulse and transmit it towards the cell body.They are the extensions of the cell body.There are no centrioles in the cell body.These granular bodies are called Nissl’s granules.The cell body has cytoplasm with a nucleus, cell organelles, and granular bodies.The neurons are amitotic.Ī neuron is composed of three major parts namely, cell body, dendrites, and axon. These nerve cells are critical for the conduction of the nerve impulse. The neurons form the basic structural and functional unit of the nervous system. ![]() Neuron: The Basic Structural And Functional Unit The collection of the peripheral nerve cells along with the afferent and efferent axons and support cells are called ganglia.The autonomic nervous system is, in turn, divided into the sympathetic and parasympathetic nervous system.The PNS is further classified into somatic and autonomic nervous system.There are two types of nerve fibres associated with the PNS sensory neurons ( afferent fibres) and motor neurons (efferent fibres).It comprises all the nerve cells which are associated with the CNS.The CNS is the site for processing the information.It comprises the brain and spinal cord.The human nervous system is divided into the following: Let us talk more about the brain and the associated organs. The nervous system, along with the endocrine system, regulates homeostasis. The nervous system forms the major communication and regulatory centre as well as the control unit. They are a special type of cells which help in conveying information. It is only because of the nervous system, which acts as an ‘Electrical Wiring,’ that we can walk, talk, eat, read, write, sit, memorise, think, and do our daily work. The human nervous system is an intricate network of nerves. The neurons form the basic unit of the nervous system. The nervous system consists of billions of neurons. We would also fail to choreograph our daily activities and not be able to accomplish our pursuits. The humankind would lose its essence and integrity. Have you ever wondered what would it be like if humans had no nervous system? It is quite difficult even to imagine such a situation.
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