Anatomy and Physiology of the Nervous System: Terms and Definitions, Quizzes of Physiology

Download Anatomy and Physiology of the Nervous System: Terms and Definitions and more Quizzes Physiology in PDF only on Docsity! TERM 1 influx DEFINITION 1 coming in (sodium) TERM 2 efflux (going out) potassium DEFINITION 2 Definition TERM 3 nerve DEFINITION 3 a collection of motor axons and sensory dendrites in PNS. TERM 4 action potential DEFINITION 4 an all or none electrical event in an axon or muscle fiber in which the polarity of the membrane potential is rapidly reversed and reestablished. TERM 5 white matter DEFINITION 5 White matter is one of the two components of the central nervous system and consists mostly of myelinated axons. This forms the region deep to the cerebral cortex in the brain and the outer portion of the spinal cord. TERM 6 grey matter DEFINITION 6 Grey matter is a major component of the central nervous system, consisting of neuron cell bodies and dendrites but few myelinated axons. it forms the cortex of the cerebrum, cerebral nuclei, and the central region of the spinal cord TERM 7 schwann cells DEFINITION 7 a supporting cell of the periphal nervous system that forms sheaths around periphial nerve fibers. schwann cells also direct regeneration of peripheral nervefibers to their target cells. TERM 8 oligodendro cytes DEFINITION 8 a type of glia cell that forms myelin sheaths around axons in the centralnervous system. TERM 9 mylelin sheath DEFINITION 9 a sheath surrounding axons formed from the cell membrane of schwann cells in the periphial nervous system and from oligiodycotes in the central nervous system TERM 10 saltatory conduction DEFINITION 10 the rapid passage of action potentials from one node of ranvier to another in myelinated axons