7/24/2023 0 Comments From axon to dendriteThe part of nerve where the cell bodies and nonmyelinated neurons are present is called as the grey matter. The part of nerve, where myelinated neurons are present in abundance, is called as the white matter. ![]() Gives white appearance (white matter) to the neural parts.ĭifferentiate between white matter and grey matter.Protects the axon from external shocks.Provide nutrients and oxygen to the axon.The myelin sheath has a shiny white colour. Myelin sheath in the brain and spinal cord is formed of specialized cells called Oligodendrocytes. Schwann cells, a part of nervous tissues repeatedly encircle the axon to form the myelin sheath. Make a table which shows the function and peculiarities of different parts of nerve cell.Īnalyse figure given below and write inferences on myelin sheath. In certain neurons, the nerve fibers are covered by myelin sheath, made up of white Schwann cells. The nervous system includes the brain, spinal cord, nerves, and receptors.Ī neuron has mainly the following parts a cyton (cell body), impulse receiving dendrons and branches of dendrons is dendrites, impulse transmitting axon and branches of axon is aconites, synaptic knobs for secreting neurotransmitter.The function of the nervous system is to generate and coordinate responses according to internal and external changes.They also transmit messages to and from central nervous system and organs. Nerve cells are capable of receiving stimuli from within the body and external environment.Nerve cells or receptors that are capable of receiving stimuli from within the body and external environment are located in sense organs.Internal stimuli: Hunger, touch, infection, pressure variation, thirst, exhaust. These are two types, external and internal stimuli.Įxternal stimuli: Sound, touch, heat, chemicals, pressure, cold, radiations. ![]() Stimulus: The senses that evoke responses in organisms are called stimuli. What are the factors to which children and organisms respond here?
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