NSG 3315 Lecture Notes - Lecture 13: Ependyma, Vasodilation, Hindbrain
Document Summary
Nervous system: receives stimuli from the internal and external environment, interprets it, and integrates it into a selected response. Central nervous system - brain and spinal cord. Peripheral nervous system - cranial and spinal nerves. Sensory neurons arrive up from the spinal cord. Brain stem - breathing, body temperature, digestion, alertness/sleep, swallowing. Cerebellum - balance, coordination and control of voluntary movement, ne muscle control. Sympathetic: catecholamines epinephrine, norepinephrine, dopamine attach to adrenergic receptors. Alpha-2 receptors - negative feedback to stop neurotransmitter release. Beta -1 receptors - speed and strengthen heart. Released from parasympathetic system and from motor neurons. Attaches to cholinergic receptors nicotinic receptors - excite skeletal muscle cells muscarinic receptors - slow heart, stimulate gi tract, vasodilator. Schwann cells contain myelin white matter help increase speed of impulse transmission. Sensory (afferent) - transmit impulses to the spinal cord and brain. Motor (efferent) - transmit impulses away from the spinal cord and brain to the muscles and glands.
