Monophasic, Biphasic & Compound Action Potential : For MBBS, BDS and Allied Health Sciences скачать в хорошем качестве

Monophasic, Biphasic & Compound Action Potential : For MBBS, BDS and Allied Health Sciences

Monophasic and Biphasic AP : • The AP is recorded by placing two electrodes in two separate site of the membrane ( one electrode is placed outside the membrane and another is inserted inside the membrane or one electrode is placed externally on the surface of the healthy site of the membrane and another at the damaged / injured / sectioned site) then the recorded action potential will be monophasic i.e in one direction only .Whereas if both the electrodes are placed at the healthy side of outside of the membrane the AP is recorded as an upward deflection followed by short isoelectric period and then a downward deflection which is known as biphasic action potential. • Monophasic AP is intracellular recording whereas Biphasic AP is extracellular recordings. • Biphasic AP is clinically more important e.g. : ECG, EEG, EMG are all biphasic type (extracellular) of AP. Compound AP : It is the monophasic recording of the action potential from the nerve trunk (mixed nerve) which contains many fibers of varying diameter . As the diameter of the nerves fiber in a mixed nerve varies their conduction rate will also vary. This is why the onset of the peak in different nerve fiber will be different resulting a wavy action potential. For further study you can refer to following books : 1. Textbook of Physiology for MBBS by A K Basak published by New Age International Pvt. Ltd. New Delhi. 2. Textbook of Physiology for BDS by A K Basak published by New Central Book Agency, Kolkata. 3. Physiology : Made Easy by A K Basak published by New Central Book Agency, Kolkata