PSYC1011 Study Guide - Final Guide: Axon Hillock, Multipolar Neuron, Bipolar Neuron
Document Summary
What is a neuron: nerve cell which transmits info, humans have about 86 billion, dendrite: Branch like structures that receive info from other neurons: cell body (soma): Phospholipid bilayer maintains ve charge in cell: nucleus: Contains genetic material tells cell what do to. Graded potentials are summed to determine if an action potential will be fired: axon: Conduct signal electrically b/t cells from cell body: axon terminals: Gap b/t neurons = pre synaptic: myelin sheath: Bare axon the (cid:858)gap(cid:859) (cid:271)/t a(cid:454)o(cid:374) parts. Clinical relevance: ms believed to be auto immune disease. Leads to failure of cells with myelinated axons: reduces speed of signal transmission ele(cid:272)tri(cid:272)al i(cid:373)pulse (cid:272)a(cid:374)(cid:859)t (cid:271)e tra(cid:374)s(cid:373)itted, causes sig. psych / physical impairment. Same structure as other neurons: bipolar neuron. Single dendrite branch at end: unipolar neuron. Dendrites + trigger zone instead of axon hillock. Send info to brain from periphery (afferent signal) Vison photoreceptors / mechanoreceptors / auditory receptors.
