proctodeum

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proctodeum

 [prok″to-de´um]
the ectodermal depression of the caudal end of the embryo, which becomes the anal canal; called also anal pit.

proc·to·de·um

, pl.

proc·to·de·a

(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]

proctodeum

/proc·to·de·um/ (-de´um) the ectodermal depression of the caudal end of the embryo, where later the anus is formed.

proctodeum

also

proctodaeum

(prŏk′tə-dē′əm)
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.

proctodeum

[proktō′dē·əm] pl. proctodea
Etymology: Gk, proktos + hodiaos, a route
a depression of the ectoderm, behind the urorectal septum of the developing embryo, that forms the anus and anal canal when the cloacal membrane ruptures. Also spelled proctodaeum ( pl. proctodaea ). Compare stomodeum. proctodaeal, proctodeal, adj.

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.

proctodeum, proctodaeum

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