单词 | proctodeum |
释义 | proctodeumn. Zoology and Embryology. The posterior portion of the alimentary canal, esp. in an embryo (in which it occurs as an invagination of the epiblast or ectoderm); spec. the hindgut of an insect or other arthropod. Cf. stomodaeum n. ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [noun] > digestive tract cloaca1726 proctodeum1876 stomodaeum1876 mesenteron1877 stomatodaeum1887 1876 E. R. Lankester in Q. Jrnl. Microsc. Sci. 16 64 A second invagination forms the true mouth and the stomodæum. [Note] This term and its correlative ‘proctodæum’ I propose for the oral and anal invaginations. 1904 Brit. Med. Jrnl. 17 Dec. 1632/2 Both cavities—the postanal gut and the proctodeum—are actively growing. 1930 H. G. Newth Marshall & Hurst's Junior Course Pract. Zool. (ed. 11) ix. 162 The proctodæum or intestine is a long, narrow, straight tube running from the hinder end of the mesenteron to the anus. 1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) xxiii. 118/1 The arthropod gut is tubular and divisible into cuticle-lined stomodaeum (foregut) and proctodaeum (hindgut)..and a generally non-cuticularized midgut. This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022). < |
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