PSY 1305 Lecture Notes - Lecture 4: Parasympathetic Nervous System, Sympathetic Nervous System, Somatic Nervous System
19 Jan 2017
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Document Summary
Adult brain has about 86 billion neurons. Brain accounts for about 2% of body weight and uses 20% of energy. Neural networks and pathways govern reflexes through highly efficient electrochemical information system. Two parts with subdivisions: somatic nervous system, autonomic nervous system. Feedback system: brain pituitary other glands hormones body and brain, this reveals the interplay between the nervous and endocrine systems. Scientists can selectively destroy or electrically, chemically, or magnetically stimulate the brain: eeg (electroencephalogram, pet (positron emission tomography, mri (magnetic resonance imaging) fmri (functional mri) Older brain structure: less complex brain in primitive vertebrates handle basic survival functions, more complex brain in advanced mammals (including humans) contain new brain systems built on the old. Brainstem: oldest and innermost brain region. Medulla: located at base of the brainstem; controls heartbeat and breathing. Pons: sits above medulla and helps coordinate movement. The (cid:271)od(cid:455)"s (cid:272)ross-wiring: nerves from one side of the brain are (cid:373)ostl(cid:455) li(cid:374)ked to the (cid:271)od(cid:455)"s opposite side.
