神经干动作电位传导速度与不应期的测定（Measurement of conduction potential and refractory period of action potential of nerve trunk）.docVIP

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神经干动作电位传导速度与不应期的测定（Measurement of conduction potential and refractory period of action potential of nerve trunk）.doc

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神经干动作电位传导速度与不应期的测定（Measurement of conduction potential and refractory period of action potential of nerve trunk）

神经干动作电位传导速度与不应期的测定（Measurement of conduction potential and refractory period of action potential of nerve trunk） Measurement of conduction potential and refractory period of action potential of nerve trunk File type: PPT/Microsoft Powerpoint file size: bytes more search: nerve action potential, conduction speed, refractory period, measurement of neural stem action potential, conduction velocity and refractory period Measurement, of, conduction, velocity, and, refractory, period, of, action, potential,, in, the, nerve, trunk Teaching objects: medical students in Medical Colleges Experimental class: 4 hours Course type: Basic Medicine Course Course requirements: required Each group number: 4 people Experimental center of medical function, Central South University I. objective requirements Preparation of specimen of toad sciatic nerve Observe the waveform of the action potential of the nerve trunk and study the activity of the nerve A method of determining the speed of conduction An excitatory change after an excitement 3. learn BL-420 biological signal acquisition analysis system for biological Signal processing and analysis method Two. Key and difficult points 1. key (1) the preparation of specimens of toad or frog sciatic nerve trunk (2) measurement of action potential conduction velocity and refractory period of nerve trunk; Determination 2. difficulties (1) elimination of stimulus artifact (2) understanding of biphasic action potential of neural stem Three. Explain before class Experimental principle: In a quiet state of nerve fibers in the nerve membrane is positive in membrane polarization negative. When excited by the stimulation of nerve fiber, the stimulated site membrane depolarization generated action potentials, and adjacent parts of the exciting film formed by local and local current, current mode of transmission. When the local current to the electrodes 4, 4 electrode membrane depolarization (membrane becomes positive, membrane becomes negative), and 5 o