Neurohistology - <-- category of sensation =...

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Unformatted text preview: <-- category of sensation = modality<-- i.e. memory from sensory modalitiesSmooth muscle○--> Involuntary muscle:NeurohistologyOctober 4, 20109:13 AMNeurohistology Page 1Electrical 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 spongesIn brain, there are class of glia cells that act as macrophages○Facilitate communication (electrical transmission)○<-- important for information transmission & transferNeurons 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-AxonC.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 generationAlong 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"Neurons are structurally different and functional implications' differences are very important"<-- shown in previous slideInterneuron = 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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This note was uploaded on 06/21/2011 for the course ANATOMY ana300y1 taught by Professor Wiley during the Fall '09 term at University of Toronto- Toronto.

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Neurohistology - <-- category of sensation =...

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