01:119:116 Lecture Notes - Lecture 18: Central Nervous System, Peripheral Nervous System, Sensory Neuron

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Conduct messages in form of electrical signals and integrate information. Diversity of shapes and sizes depending on exact function but all share basic structural characteristics: cell body, cytoplasmic extensions: 2 types, dendrites, axon, cell body. Contains all typical cellular organelles: nucleus, mitochondria, golgi, etc: dendrites. Receive information from environment or from another neuron. Most neurons have many short, branched dendrites: axon, transmits neural impulse away from cell body to either: Sensory neuron= afferent neuron receive sensory stimuli and conduct info toward processing center: integration= sensory input sorted and interpreted in processing center then associated with appropriate responses. Interneurons 90% of all neurons in human brain: motor output. Motor neuron= efferent neuron transmit information from processing center to effectors. Selectively permeable cell membrane allows certain ions to cross, but not others. Results in polarity (charge) between outside and inside of cell. Charge different is negative inside of cell is negative compared to outside creates a voltage.

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