Introduction to physiology

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Presentation transcript:

Introduction to physiology Nerve and Muscle Dr. Barney Ward, Consultant Anaesthetist

Nerve & Muscle Neurophysiology is a huge subject! How do nerves conduct signals? How they connect to muscles? How simple reflex arcs work

Nerve Structure

Nerve Conduction Electrical nature of nerve conduction discovered in 1791 Physiological nerve conduction occurs in one direction only But can go both ways in the lab Impulses arise due to changes in the cell membrane

Nerve Conduction Channels for sodium and potassium ions exist in memebrane Changes in voltage cause these to open & close Result is self-propagating wave of depolarisation

The Action Potential

The Action Potential

Myelin

Nerve / Muscle Junction

Feedback & Muscle Control

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