Section 8 visceral nervous system Flashcards Preview

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Flashcards in Section 8 visceral nervous system Deck (23):
1

visceral nervous system

1. maintains homeostasis within body
2. monitors and controls the function of our internal organs
3. monitors and controls blood vessels and structures in the skin

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divisions of visceral nervous system

1. afferent (sensory)
2. efferent (motor)

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afferent

GVA general visceral afferent
carries information from internal organs

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efferent

GVE general visceral efferent
controls smooth muscle, cardiac, muscle, glands under subconscious control

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visceral afferent system

a. nociceptors: pain
b. mechanoreceptors: fullness
c. specialized receptors to detect internal chemical or physical environment

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visceral afferent neurons

unipolar neurons
cell bodies located in the spinal ganglia (T1-L2, S2-S4, CN IX, CN X)

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visceral afferents carrying pain are mainly carried along the

sympathetic efferents

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visceral afferents carrying mechanoreceptors and specialized receptors are carried along

parasympathetic efferents

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visceral afferents from the thoracic and most abdominal viscera are carried by the

vagus nerve CN X
mechanoreceptors in the smooth muscles detect fullness and cramps

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visceral afferents carried along the CN IX carry

info from the chemoreceptors and baroreceptors in the carotid sinus
detect blood pressure and gases and also gag reflex

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GVE general visceral efferent

autonomic nervous system
sympathetic "fight or flight"
parasympathetic "rest or digest"

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ganglia also contain

visceral afferents

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some visceral motor can

respond directly to the visceral sensory input without influence from the CNS

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sympathetic division

AKA thoracolumbar division
short preganglionic neuron
long postganglionic neuron
uses acetylcholine in the ganglion
norepinephrine at the target tissue
rise in blood pressure
increase in blood sugar levels
redirects blood flow to skeletal muscles and away from organs
dilation of the pupils
decreased saliva

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white communicating Ramus

branches off of spinal nerves and connects the preganglionic fibers to the sympathetic trunk
part of sympathetic division

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sympathetic trunk

chain of ganglia that contains the cell bodies of the postganglionic fibers
part of sympathetic division

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parasympathetic division

craniosacral (CN III, VII, IX, X, S2-S4)
long preganglionic neuron
short postganglionic neuron
uses acetylcholine in the ganglion
acetylcholine at target tissue
targets thoracic, abdominal, and pelvic viscera
decreases cardiac output
decreases blood pressure
speeds up peristalsis in GI
increases salivation
causes pupillary constriction
micturition

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CN III

oculomotor nerve
parasympathetic motor to sphincter pupillae, ciliary muscles for accommodation
Edinger Westphal Nucleus
carries GVE Fibers to ciliary ganglion for pupil constriction

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CN VII

Facial Nerve
parasympathetic innervation to lacrimal, submandibular, and sublingual glands
secretion of tears
stimulation of saliva

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secretion of tears

superior salivary nucleus ->
Pterygopalantine ganglion ->
lacrimal gland

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stimulation of saliva

superior salivary nucleus ->
Submandibular ganglion ->
submandibular glands

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CN IX

Glossopharyngeal nerve
general visceral efferent GVE from hypothalamus and olfactory system
Inferior salivary nucleus -> otic ganglion -> stimulation of the parrot gland
controls parotid gland, carotid body, carotid sinus

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CN X

Vagus Nerve
GVE Dorsal motor nucleus of Vagus N -> parasympathetic to smooth muscles and glands of the pharynx, larynx, and thoracic and abdominal viscera