Flashcards in Unit VII - Visceral Afferents & Parasympathetics Deck (120)
Which is generally considered cholinergic: sympathetics or parasympathetics?
Which is generally considered adrenergic: sympathetics or parasympathetics?
Where are the cell bodies located in the visceral afferent system?
In posterior root ganglia or relevant cranial nerve ganglion
Where do sympathetic afferents travel?
Through sympathetic trunk and to spinal ganglia by passing through white ramus communicans
Where do parasympathetic afferents travel?
In sacral spinal nerves and cranial nerves
Preganglionic parasympathetic fibers are carried in what cranial nerves?
Oculomotor, facial, glossopharyngeal, and vagus nerves (3, 7, 9, and 10)
Preganglionic parasympathetic fibers are carried in what sacral spinal nerves?
2, 3, and 4
Where do preganglionic parasympathetic fibers generally synapse?
On postganglionic neurons in peripheral ganglia
What is the effect of postganglionic parasympathetic fibers on cardiac output?
What is the effect of postganglionic parasympathetic fibers on the bronchial tree?
What is the effect of postganglionic parasympathetic fibers on the pupils?
What is the effect of postganglionic parasympathetic fibers on peristalsis?
What do the parasympathetic fibers of cranial nerves III, VII, and IX supply?
Structures in the head
What do the parasympathetic fibers of cranial nerve X supply?
Cardiac, respiratory, and digestive structures in the neck, thorax, and abdomen
What do the parasympathetic fibers of sacral spinal nerves 2, 3, and 4 supply?
Distal parts of the digestive system and urogenital systems
Which fibers have more variability in the amount of neurotransmitters available for use: pre or postganglionic?
Dendrites of visceral afferent neurons carry impulses from viscera via what structures?
Via autonomic ganglia, plexus, or even somatic nerves (without synapse)
Axons of visceral afferent nerves enter the CNS through what structures?
Posterior root or specific spinal nerve
Visceral afferent neurons are associated with receptors that are sensitive to what kinds of things?
Pressure, chemical concentrations, and muscle stretching
What kinds of parasympathetic fibers are associated with cranial nerves 3, 7, 9, and 10 and S2-4?
What neurotransmitter is most commonly used by the preganglionic parasympathetic fibers of cranial nerves 3, 7, 9, and 10 along with S2-4?
Where are preganglionic parasympathetic cell bodies located for cranial nerve III?
Accessory oculomotor nucleus
Where do preganglionic parasympathetic fibers of cranial nerve III synapse?
What is the location of the accessory oculomotor nucleus?
Periacqueductal gray - midbrain
Postganglionic fibers of cranial nerve III are carried in what nerves?
Short ciliary nerves
What muscles are supplied by the postganglionic fibers of cranial nerve III?
Sphincter pupillae and ciliary muscle
What is the action of the ciliary muscle?
Increase convexity of the lens to enable focus on closer objects
What is the action of the sphincter pupillae muscle?
Constriction of the pupil
Where are preganglionic parasympathetic cell bodies of the facial nerve located?
Superior part of salivary nucleus