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Neurohistology - Neurohistology October 4 2010 9:13 AM <...

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<-- category of sensation = modality <-- i.e. memory from sensory modalities Smooth muscle --> Involuntary muscle: Neurohistology October 4, 2010 9:13 AM Neurohistology Page 1
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Electrical means of given cell (rapid communication) Non-electrical but chemical (molecule from first cell transferred to adjacent cell <-- Not responsible for communication Reticular fibres organizes the cell of the organ Brain has no reticular fibre. How does it organize itself? By Glia Interstitial fluid of brain, its composition is tightly controlled and is different To supply blood, and buffering excess ion and nutrients. <-- act like sponges In brain, there are class of glia cells that act as macrophages Facilitate communication (electrical transmission) <-- important for information transmission & transfer Neurons are functionally polarized (input end --> output end) Dendrite: A. Receives input from environment or from another neuron - Receives chemical communication from another neuron - Cell body B. Some receives input - Integrates all information received from dendrites @ end of cell body - Axon C. Integration (decision to respond) - Strength of stimulus correspond to number of AP AP --> fixed amplitude - Synaptic terminals D. Chemical transformation of information, the target cell may be another neuron, triggering AP to another dendrites - Target cell varies - Amplitude is proportional to strength of stimulus along electrical signals Dendrites do not extend. Nucleus, RER, SER, mitochondria, other organelles found <-- protein production!!! <-- integration determined for AP generation Along the axon toward terminus Presence of myelin speeds up the AP** <-- important functional application Axons branch near terminus & end up as "terminal boutton" (swelling) Neurohistology Page 2
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"Neurons are structurally different and functional implications' differences are very important" <-- shown in previous slide Interneuron = short neurons within nervous system Both branches are structurally and functionally "axon" Axon arises as a single process of cell body and divides into 2 arms (rami).
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