Physiology 2130 Lecture Notes - Lecture 6: Thalamus, Interneuron, Autonomic Nervous System

• School: Western University
• Department: Physiology
• Course: Physiology 2130
• Professor: Anita Woods

Document Summary

Corticospinal tract: millions of axons who"s body lie in m1, descends from m1 to brain stem. Muscle receptors for proprioception: sense length and stretch of muscle, gamma working to detect stretch from sensory region and fire ap in intrafusal. Intrafusal muscle fiber: activated by gamma motor neurons and are stretch muscles: gamma motor neurons (two sets): activate intrafusal fiber. Central sensory region: contains a sensory neuron: when muscle stretches, sensory region stretches, this initiates depolarization (ap) of sensory neuron, more stretch more depolarization recognized by primary. Somatosensory cortex and cerebellum: golgi tendon organ, detect muscle tension. Involuntary control automatic: syn and psyn usually opposite---syn activates, psyn inhibits, preganglionic neurons leave spinal cord and release ach or norepinephrine. Autonomic nervous system: sympathetic (syn): fight or flight. Increases heart rate and blood pressure, dilates airways and blood vessels, shuts down digestive system: nerves exit spinal cord in thoracic and lumbar regions, preganglionic neurons synapse in ganglia with.