PPT-Nerve Action Potential :2

DrViral I Champaneri MD Assistant Professor Department of Physiology 1 Learning Objectives Stages of Action Potential Repolarization Positive afterpotential After hyperpolarization. 2nd. practice. Medical Informatics. Biomedical Signal Processing. TAMUS, Zoltán Ádám. zoltanadam_tamus@yahoo.com. Examples of Biomedical Signals. Action potential. Electroneurogram (ENG). Electromyogram (EMG). Learning Objectives. To understand what factors affect the speed of conductance of an action potential.. To understand what the ‘refractory period’ is.. To understand what the role of the refractory period is in separating one impulse from the next.. Schwann Cells. Myelin Sheath . Node of Ranvier. Motor neurones transmit impulses from the central nervous system to effector (muscle or gland). . The myelin sheath is formed by . Schwann Cells . wrapping themselves around the axon along its length. The enclosing sheath is made of lipids and proteins. The sheath increases the speed of conduction of nerve impulses. . 6.5 Nerves, Hormones, and Homeostasis. How do neurons communicate and relay information?. http://www.pennmedicine.org/encyclopedia/em_DisplayAnimation.aspx?gcid=000089&ptid=17. Action Potential. ~1900 Julius Berstein suggested that nerve impulses were an electrochemical message created by the movement of ions through the nerve cell membrane.. What you need to know:. Three Basic Functions. Functional Organization. Neuron Structure. Reflex Arcs. Nerve Impulse physiology. Brain Structure/Function. Basic Functions. of the. Nervous System. Dissection on a giraffe: investigating the recurrent laryngeal nerve. http://www.youtube.com/watch?v=cO1a1Ek-. HD0. Electrochemical Impulses. Electrochemical Impulses. Nerve impulses are electrochemical messages created by the movement of ions through the neuron cell membrane. Membrane Potential . = difference in electrical charges between inside & outside of neuron. http://highered.mheducation.com/sites/0072495855/student_view0/chapter14/animation__the_nerve_impulse.html. Chapters 27. “Our conscious model of reality is low-dimensional projection of the inconceivably richer physical reality surrounding and sustaining us. Our sensory organs are . limited.They. . evolved for reasons of survival, not for depicting the enormous wealth and richness of reality in all its unfathomable depth”. Conduction Velocity. and. Determining the Site and Extent of Spinal Cord Injuries . based on Sensory Deficits. The proximity of the Ulnar nerve near the surface at elbow and wrist makes it . well suited for studying action potential conduction velocity.. To understand what a . resting potential . is.. To understand how a . resting potential . is established in a neurone.. To understand what an . action potential . is.. Welcome to Hell… Population = You. Conduction Velocity. and. Determining the Site and Extent of Spinal Cord Injuries . based on Sensory Deficits. The proximity of the Ulnar nerve near the surface at elbow and wrist makes it . well suited for studying action potential conduction velocity.. Conduction Velocity. and. Determining the Site and Extent of Spinal Cord Injuries . based on Sensory Deficits. The proximity of the Ulnar nerve near the surface at elbow and wrist makes it . well suited for studying action potential conduction velocity.. Dept of . Zoology,MRGC. , . OBJECTIVES:. TO STUDY. ............ TYPES OF NEURONS. FUNCTIONS OF NERVOUS SYSTEM. IMPORTANT TERMS. PHYSIOLOGY OF NERVE IMPULSE. 3. rd. Semester Zoology (Major)-CC IV: Controlling and Coordinating System :Nervous system: Physiology of nerve impulse conduction. Cell body —> 5 - 7 dendrites —> Long, fibrous axon —> divides into terminal branches —> each ends in a terminal knob. . Myelin sheaths - formed by Oligodendrocytes . 4 zones to a nerve fiber .