PSY 250 Lecture Notes - Lecture 3: Axon Hillock, Topical Anesthetic, Lidocaine

• School: Stony Brook University
• Department: Psychology
• Course: PSY 250
• Professor: Ryan Parsons

Document Summary

Acion potenial basic properies: threshold of excitaion: the membrane potenial that must be reached for an acion potenial to occur (approximately -55mv, all-or-none phenomena- aps happen or they don"t. Conducion of the acion potenial: ap is generated at the axon hillock and propagates down the length of the axon, conducion of acion potenials non-decremental; it does not weaken, conducion in unmyelinated neurons. The neuron depolarized at each part of the membrane; slow: conducion in myelinated neurons. The neuron depolarizes only at the nodes of ranvier; salutatory conducion; fast. Axosomaic: axon connects to the cell body (soma) Axoaxonic: allows for control over the acivity of a single synapse rather than the enire neuron: key events at the synapse. Nt is a ligand of its receptor: the receptor subtypes are located in diferent areas of the brain, classiicaion of receptors, ionotropic: direct and fast acing. Ligand-gated ion channels: metabotropic: indirect and slow acing. Linked with g proteins (acivate second messenger system)