anatomy doubt

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the principal fibers of dental pulp are sympathetic and afferent fibers[dental decks-anatomy].I understood the afferent part..can anyone plz explain me the sympathetic part.

 

[bobino]

sympathetic nerves innervate the blood vessels in the pulp and can cause vasoconstriction via adrenergic receptors (alpha 1).

 

[mission dds]

sympathetic nerves innervate the blood vessels in the pulp and can cause vasoconstriction via adrenergic receptors (alpha 1).

thanks a lot.i really appreciate it