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Dominic Luster Autonomic nervous system (PSNS effects on organs (Salivary…
Dominic Luster Autonomic nervous system
Autonomic nervous system: General visceral motor division.
Innervates with smooth and cardiac muscle, and glands.
Has two neuron pathways
Preganglionic neuron
The cell body lies within the central nervous system.
Post ganglionic neuron
Has an axon that extends to the visceral organ.
Function: The preganglionic neuron signals the postganglionic to stimulate muscle contraction and glad secretion.
General visceral sensory system
Monitors visceral organs so that the (ANS) can make adjustments.
Parasympathetic division: Rest & digest
The only neurotransmitter that is involved with the ASNS is acetycholine.
A short postganglionic axon innervates with the target organ.
The synapses between pre and post ganglionic neurons occurs close to or within the target organ.
Cell bodies are located in the gray matter of the brain stem in cranial nerves 3, 7, 9, 10, & sacral region of the spinal cord.
Function:
Most active when the body is at rest or experiencing on of the 4 E's.
Controls digestion and feces elimination.
Controls the erection of the male penis.
Somatic nervous system
Cell body is located in the ventral horn of gray matter.
A long axon extends from the ventral root to skeletal muscle cell.
Has 1 neuron pathway
Neurotransmitter: Acetycholine
Targets skeletal muscle
Axon innervated intercostal muscle cells.
Sympathetic division: Fight or flight
A long axon extends from the autonomic ganglion to the target organ
Neurotransmitter: Norepinephrine
Has chain or trunk ganglia
Preganglionic exons emerge from T8-L1 to innervate with the adrenal medulla.
The adrenal medulla secretes: Epinephrine, and norepinephrine.
Preganglionic synapses with the postganglionic adjacent to the spinal column.
Neurotransmitter: Acetycholine
Cell bodies are located in the later horn of gray matter.
Function: Is most active when the body is in one of the 4 E's stages.
Energency
Embarrassment
Excitement
Exercise
Controls ejaculation
PSNS effects on organs
Salivary glands
Increases activity
Liver
No effect
GI tract
Increases activity of muscles and glands.
Airway of lungs
Bronchioconstriction
iris
Pupil constriction
Heart
Decreases heart rate
lens
Adjusts lens for near vision
blood vessel
Little to no effect, vasoconstricts the coronary vessels.
Adrenal medulla
No innervation
Arrector pili muscle
No effect
Sweat gland
No effect
SNS effects on organs
Iris
Pupil dialation
Sweat gland
Increases secretion
Lens
Adjusts lens for distance vision
Blood vessels
Constricts some blood vessels to increase BP.
Adrenal medulla
Secretes epinephrine and norepinephrine
Salivary gland
Decreases activity
Arrector pili muscle
Contraction
Liver
Releases glucose
Airway of lungs
Bronchiodialation
GI tract
Decreases activity of muscles and glands.
Heart
Increases heart rate