PSY290H5 Lecture Notes - Lecture 3: Peripheral Nervous System, Neuroglia, Oligodendrocyte
Document Summary
Neurone: it is a basic unit of the nervous system, and it is a basic unit of communication. They differ from other cells by their three main functions and they are reception, conduction and transmission. The neural cell body: proteins that receive signals from other cells are reception, neural function requires a lot of energy for its function, and mitochondria provides the source of energy for the action potentials to be triggered. Not all axons are myelinated, and not all axons are myelinated by the same thing: nodes of ranvier: these are small gaps between the myelin sheaths. The neural membrane: ion channels allow electrical substances to pass through, they allow charged substances to pass through and are very sensitive to type of charge and the size of the ions. Ions that are necessary in the neural communication are na. There are also mechanisms that sort the ions out. Ions only occur on myelinated axons on only nodes of ranvier.
