Neurons/Nerve Impulses/Synapses

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Presentation transcript:

Neurons/Nerve Impulses/Synapses Pg. 2

Neurons Cells that carry messages throughout the nervous system 3types: - 1st: sensory neurons- carry impulses from sense organs to brain; 2nd: motor neurons- carry impulses from brain to muscles/glands. 3rd: Interneuron: carry impulses between sensory and motor neurons (connects them) Pg. 2

sensory neurons- Interneuron motor neurons-

Parts of a neuron 1st cell body: largest part, contains nucleus and most of cytoplasm – most metabolic activity of cell occurs here 2nd dendrites: spread out from cell body; short, branched extensions; carry impulses toward the cell body Pg. 2

Parts of a Neuron cont. 3rd axons: (transmit/send signals) long fiber that carries impulses away from cell body. 4th myelin sheath: (lipids) insulating membrane around axon; helps impulse travel faster & smoother 5th Schwann cells- cells of the mylelin sheath One neuron can have dozens of dendrites but only one axon.*{bonus?}* Pg. 2