PSYC 3458 Lecture Notes - Lecture 5: Marginal Nucleus Of Spinal Cord, Grey Matter, Neocortex
2 Feb 2017
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Document Summary
Genetic, proteins, and the cellular basis of behavior. Theories: reticular theory= the nervous system is made up of a network of continuous bers (no separation between cells, neuron theory/doctrine= the nervous system is cellular, each with a nucleus and its own membrane (neurons) Functional units of the brain: 2 principal cell types in the nervous system. Glia= provide structural and metabolic support for neurons. The neuron: each piece of neocortex is composed of millions of neurons organized into an intricate web of connectivity. Neocortex: sheet of neurons covering the surface of the brain (grey matter) Layer of grey matter that is ~1mm thick contains about 30 billions neural connections!: lamina 1= molecular level, lamina 2= external granular, lamina 3= external pyramidal, lamina 4= internal granular, lamina 5= internal pyramidal, lamina 6= multiform. Maintains neuronal structure via complex networks of scaffolding throughout the cytoplasm; structure is dynamic (can change shape) Micro laments: determine cell/neuron shape, made from the protein actin.
