PS 101 Lecture Notes - Lecture 3: Myelin, Homeostasis, Autonomic Nervous System
Document Summary
Autonomic nervous system: structures connected with basic life processes (heart and lungs) Parasympathetic nervous system: regulates duties, returns to baseline after emergency. Spine is segmented into 31 pairs of sensory and motor neurons. Hindbrain: directly above and is linked to spinal cord. Sustains life: air flow, blood flow, and arousal level. Medulla oblengata: extension of spinal cord into brain. Reticular formation: neurons that extend from medulla to upper end of the midbrain. Midbrain: tectum: involved with vision and hearing tegmentum: orients body and eyes toward sensory stimulus. Dendrites: collect input from other neurons-extend from body cell. Premature babies do not have enough nerve cells. Resting neurons are polarized: sodium and chloride ore. -a single neuron has no function if there are no other neurons to communicate. Sensory neurons: take from sensory organs to brain (eyes and ears) Motor neurons: information from brain to organs & muscles. Depolarization: influx of positive sodium ions-likely to fire.
