PSYCH 100 Lecture Notes - Lecture 6: Cerebellum, Myelin, Midbrain
Document Summary
Psych 100 lecture 6 the nervous system. Activates the fight or flight response: parasympathetic nervous system: reverses the effects of the synthetic nervous. How neurons fire: resting potential (polarized): negative charge on inside; positive charge on outside, permeability (allows for depolarization): mixing of positive and negative ions, action potential: electrical charge that initiates firing, myelin sheath: insulates axon for faster transmission. Imbalances of acetylcholine are linked to alzheimer"s disease. Imbalances of serotonin are linked to depression, anxiety, and eating disorders. Imbalances of dopamine are linked to schizophrenia and parkinson"s disease. The brain stem: medulla and pons: control vital autonomic functions (heartbeat, blood pressure, breathing) and reflexes (coughing, vomiting, sneezing, reticular formation: controls general alertness and consciousness, cerebellum ( little brain ): controls complex motor movements. The midbrain: substantia nigra: dopamine center, relays physiological messages from brain stem to cognitive functions of forebrain (connects sensations to thoughts)
