ANP 1106 Chapter Notes - Chapter 8: Postcentral Gyrus, Precentral Gyrus, Primary Motor Cortex
30 Mar 2016
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Cns (central ns): brain/spinal cord integrating/command center: receives info combo interpret/decide appropriate response. Pns (peripheral ns): cranial/spinal nerves communication between cns/rest of body incoming/outgoing: a. sensory division: somatic/visceral fibers. Not aware of everything most at non-conscious level. Important stuff goes through at the level of the brain: b. Motor division: motor nerve fibers (outgoing) cns effectors (muscles/glands targets: somatic ns: voluntary: cns skel muscles. Ii) autonomic ns: involuntary (visceral motor): cns cardiac muscle/smooth muscle/glands. B) parasympathetic: conserve e during rest/digest (cid:1) Histology of nervous tissue more cellular than ecm. 2 main types of cells: neurons + supporting cells (housekeeping) Supporting cells cns: 1) astrocytes most abundant. Star-shaped (processes stick out and touch neurons) Nutrient exchange, enviro control (put k+ released from neurons back in), antigen presentation: 2) microglia. Thinner processes touch neurons to assess well-being. Can transform into macrophages (~immune sys cells) Gets rid of debris/neurons optimal enviro: 3) ependymal cells.
