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organ systemnetwork of neurons - specialized cellstwo parts - central and peripheral
A neuron is a specialized type of cell found in the bodies of most animals. Only sponges and a few other simpler animals have no neurons. The features that define a neuron are electrical excitability and the presence of synapses, which are complex membrane junctions that transmit signals to other cells.
The peripheral nervous system - sensory neurons, clusters of neurons, and nerves connecting them to each other and to the central nervous system
The central nervous system - brain, spinal cord, retina
At the end of each nerve cell there is a synaptic terminal. This is full of extremely tiny sacs which hold neurotransmitter chemicals. These chemicals transmit impulses from one nerve to another or from nerves to muscle cells.
neuronelemetal part of nervous system
An impulse travels along the neuron to these sacs which then release the neurotransmitter chemicals. The chemicals move along to the next neuron sparking an electrical charge which moves the nerve impulse forward.
Node of Ranvier
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bravo bravo i am very interested in anatomy and i want to be a doctor(neurologist).love this!
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