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Lecture

BIOL 1F25 - Lec 2

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Department
Biology
Course
BIOL 1F25
Professor
Nicholas D Vesprini
Semester
Winter

Description
Lecture 2 Unique Structures of Neurons -Axon: main conducting unit of cell (output region); conducts action potentials -Dendrite: main receiving area of brain cell -Excitable cells > Send electrical signals -action potential is a non-decaying electrical signal Take-home Message -despite some differences, signaling is stereotypical -how is specificity of message achieved? 1. Pathway, 2. Localization of function, 3. Firing pattern (i.e. slow spikes vs. fast bursts) The Synapse -a connection between two nerve cells or the nerve cell and a target cell (e.g. gland or muscle) -distinct gap between two brain cells; ~20 nm across; gap called synaptic cleft -Synaptic vesicles in axon terminal contain chemicals, used as a message at the synapse; called neurotransmitters Definition of a Synapse -a specialized morphological structure between two synaptic partner cells Development of the CNS -development of the central nervous system (CNS) of mammals: ~10,000 synapses formed in as short a time as 15 minutes -during development it is essenti
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