Review of the Sympathetic and Parasympathetic Divisions definitions Flashcards
Review of the Sympathetic and Parasympathetic Divisions definitions
You can tap to flip the card.
Control buttons has been changed to "navigation" mode.
1/15Skip to main content
Dual innervation Refers to organs receiving inputs from both sympathetic and parasympathetic nervous systems. Sympathetic fibers Originate from spinal cord segments T1-L2, increase heart rate, and have short preganglionic fibers. Parasympathetic fibers Originate from cranial and sacral regions, decrease heart rate, and have long preganglionic fibers. Preganglionic fiber Nerve fiber that extends from the central nervous system to a ganglion. Postganglionic fiber Nerve fiber that extends from a ganglion to an effector organ. Sympathetic trunk Chain of ganglia located near the spinal cord where sympathetic fibers synapse. Collateral ganglia Ganglia where some sympathetic fibers synapse, bypassing the sympathetic trunk. Terminal ganglia Ganglia located near or on effector organs where parasympathetic fibers synapse. Splanchnic nerves Nerves that bypass the sympathetic trunk to synapse in collateral ganglia. Effector organ Target organ or tissue that responds to nerve impulses. Cranial region Area of the brainstem where parasympathetic fibers originate. Sacral region Lower spinal region where parasympathetic fibers originate. Fight or flight response Physiological reaction to perceived harmful events, activated by sympathetic nervous system. Rest and digest effect State of relaxation and digestion promoted by parasympathetic nervous system. Synapse Junction between two nerve cells where impulses pass by diffusion of neurotransmitters.
4:39
