You know what it looks like… but what is it called?
TAKE THE QUIZ“crypt of”
The following 2 entries include the term crypt of.
crypt of Lieberkühn
noun: any of the tubular glands of the intestinal mucous membrane
crypt of Morgagni
noun: any of the pouched cavities of the rectal mucosa immediately above the anorectal junction, intervening between vertical folds of the rectal mucosa
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Merriam-Webster unabridged