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the ectodermal depression of the caudal end of the embryo, which becomes the anal canal; called also anal pit.


, pl.


(prok'tō-dē'ŭm, -dē'ă),
1. Terminal portion of the insect alimentary canal, extending from the pylorus (area of malpighian tubule attachment) to the anal opening; in certain diptera (flies) and other insects, the proctodeum is divided into a tubular anterior intestine and an enlarged posterior intestine, or rectum, ending at the anus.
2. Synonym(s): anal pit
[L. fr. G. prōktos, anus + hodaios, on the way, fr. hodos, a way]




n. pl. procto·dea (-dē′ə) or procto·deums also procto·daea (-dē′ə) or procto·daeums
An inward fold on the surface of the embryonic ectoderm that develops into part of the anal passage.

a·nal pit

(ā'năl pit)
1. An ectodermally lined depression under the taillike caudal eminence adjacent to the terminal part of the embryonic hindgut; at its bottom, proctodeal ectoderm and cloacal endoderm form the cloacal plate. When this epithelial plate ruptures, the anal and urogenital external orifices are established.
Synonym(s): proctodeum.
2. Terminal portion of the insect alimentary canal.