proctodeum


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Related to proctodeum: proctodynia

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.
References in periodicals archive ?
The proctodeum initiates in the pyloric valve, continuing with the ileum and colon with a duct leading to the anus; this region has various folds in which the reproductive organs are inserted.
The additional engrailed stripes seven to nine lie clearly in front of the telson anlage, which is characterized by the proctodeum and which lacks engrailed expression.
On histologic examination, a partially encapsulated and densely cellular mass infiltrated the external muscular layer of the proctodeum (Fig 2).