PSY 1101 Lecture Notes - Lecture 5: Myelin, Central Nervous System, Resting Potential

• School: University of Ottawa
• Department: Psychology
• Course: PSY 1101
• Professor: Kenneth Campbell

Document Summary

Grey and white matter (length of axon) Myelin sheath: - m. s not able to control movements. Sensory neurons: transmit impulses received by sensory receptors to central nervous system (cjs) afferents. Motor neurons: carry outgoing signals from cns to muscles and glands. Interneurons: no direct connection to the outside world neurons connecting to other neurons. Often, far removed from either sensory or motor neurons. All cells carrying and electrical charge (potential) The charge of the neuron can change. This allows one neuron to communicate to another (or to perhaps a muscle) Excess of negatively charge ions inside the nerve cell. Charge is about -70m volt (mv) for humans. Mainly because of buildup of chloride (inside) Outside, a buildup of positively charged ions, largely sodium (na+) Inside, a surplus of negatively charge molecules (ions) If the level of excitation is not enough (the critical threshold is not reached) When the dendrite is electrically stimulated (axon.