L33 Psych 326 Lecture Notes - Lecture 5: Central Nervous System, Parasympathetic Nervous System, Sympathetic Nervous System
12 Jul 2019
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Document Summary
Physical changes and age-related health conditions: the brain. Central nervous system (cns): the brain and spinal cord. Peripheral nervous system (pns): all other bodily nerves. Divided into somatic (voluntary) nervous system and autonomic (involuntary) system. Enteric (gastrointestinal) nervous system (aka gut-brain system) Fewer neurons in brain and spinal cord. Reduced visual acuity (lens is yellowing less able to see blue. White matter: mostly axons, enclosed in myelin making the tissue appear white. White matter grows in volume (later than grey matter) with myelination until around age 40 (very slowly from 20 to: and declines more rapidly than grey matter during late adulthood. Lifo (last in first out): areas that developed later are the first to be affected by aging. Areas that matured later (thus thinner myelin) are more vulnerable to the effects of aging. Whole brain volume starts to decrease after 30. Rate of volume loss increases from mid-50"s to early 60"s and varies across brain regions.
