Medical Definition of palatopharyngeal arch
: the more posterior of the two ridges of soft tissue at the back of the mouth on each side that curves downward from the uvula to the side of the pharynx forming a recess for the palatine tonsil as it diverges from the palatoglossal arch and that is composed of part of the palatopharyngeus with its covering of mucous membrane—called also posterior pillar of the fauces, pharyngopalatine arch
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