HLSC 1200U Lecture Notes - Lecture 16: Postcentral Gyrus, Precentral Gyrus, Corticobulbar Tract
16 Nov 2016
School
Department
Course
Professor
Document Summary
Chapter 14: central nervous system 2: the brain (online) Composition: almost 100 billion neurons and as many glia. Contains cell bodies, synapses, neuroglia of cns. Location: external cortex of cerebrum and cerebellum. Function: integrate and process information before initiating a response. Contains bundles of axons (tracts) which are usually myelinated (fat) Ascending (sensory) tracts and descending (motor) tracts. Function: helps nerves conduct action potential more rapidly, conduction route to and from the brain. Largest and uppermost division of the brain. Consists of right and left cerebral hemispheres divided by longitudinal fissure (falx cerebrix) Cerebral cortex: outer surface made of 6 layers of gray matter. Gyri (gyrus): convolutions or bumps you see on the outside of the brain. Sulci (sulcus): grooves that sink into the center of the brain. Longitudinal fissure: deepest fissure, divides cerebrum into two hemispheres. Lateral fissure: between temporal and parietal lobes. Central sulcus: between frontal and parietal lobes. Parietooccipital sulcus: between occipital and parietal lobes.
