interneurones which pass on impulses from sensory neurones, up the spinal cord to the brain, or directly on to :.sensory neurones - which collectively make up afferent nerves - inputs to the nervous system, and.Within the peripheral nervous system there are 3 main types of neurone: Schwann cells and oligodendrocytes ( see below) are examples of neuroglial cells. The more numerous neuroglial cells perform a support function. There are many types/shapes of neurone, and it is helpful to consider sensory, relay/intermediate and motor neurones, especially in the context of a reflex action. Others pass on impulses to other neurones and then to muscles or glands. Some neurones generate impulses as a result of detecting a stimulus. Dendrites bring impulses in, and the axon takes impulses away from the cell body. Neurones have thin extensions - also known as nerve fibres - bringing impulses into and away from the cell. axon also contains 10nm diameter neurofilaments composed of polypeptide chains related to keratin (structural support).microtubules along axon (transport of proteins etc from cell body).
#All or none principle action potential free#
prominent Nissl granules/bodies - endoplasmic reticulum with rosettes of free ribosomes - in cell body only (protein synthesis).mitochondria in cell body and terminal bulbs (aerobic respiration).Structures not shown on the diagram above (and functions) : They provide a pathway for the flow of information from one part of the body to another, as well as the processing of that information, possibly preventing information from proceeding. Some neurones can be quite long - the length of a limb. Nerve cells - neurones or neurons - have all the normal features of body cells: a cell membrane enclosing the cytoplasm and a nucleus, but there are some modifications related to their specific function - the passage of nervous impulses.
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