BIOLOGY 173 Lecture Notes - Lecture 28: Medulla Oblongata, Axon Terminal, Nissl Body
15 Nov 2016
School
Department
Course
Professor
Document Summary
Properties: extreme longevity >100 years (they live as long as the person does, amitotic = do not divide. Nasal smell, hippocampus memory; neurons can divide: high metabolic rate high oxygen requirement. Cell body / soma: nucleus, mitochondria, lysosomes, golgi, cytoskeleton neurofilament and neurotubules support extensions, endoplasmic reticulum (abundant) rer = Dendrites: slender branched projections, receive signals. Initiates electrical signal and conducts signals away from soma. Final branches / telodendria: enlargement at end: boutons axon terminal knobs. Formation of the myelin sheath formed when neuroglia wrap around axon. Ig(cid:374)al (cid:862)ju(cid:373)ps(cid:863) fro(cid:373) o(cid:374)e (cid:374)ode to the (cid:374)ext. Multipolar: many dendrites, one axon, motor neurons, most common. Bipolar: one dendrite, one axon, soma in the middle, rare special sense organs (eye, ear, nose) Unipolar: soma, one process, one axon with two heads and dendrites at the end of the axon, most sensory neurons (input, sensory neurons of pns. Anaxonic: no distinct axons or dendrites, rare, small, lack features that distinguish dendrites from axons.
