Sunderland (MA): Sinauer Associates; 2014. They eventually come to form the lining of the digestive system in the human body, except for parts of the mouth, throat, and rectum. It also gives rise to the epithelium of the Eustachian tube and tympanic cavity in the ear, and to the bladder and urethra. The endoderm subsequently gives rise to the epithelium (tissue that covers, or lines, a structure) of the pharynx, including the eustachian tube, the tonsils, the thyroid gland, parathyroid glands, and thymus gland; the larynx, trachea, and lungs; the gastrointestinal tract (except mouth and anus), the urinary bladder, the vagina (in females), and the urethra. The Oxford Pocket Dictionary of Current English. Studies on the development of the foregut in the chick blastoderm. Rec. The absence of hypoblast results in multiple primitive streaks in chicken embryos. [5][6] However, it took a long time before people realized that the primitive endoderm will be replaced by definitive endoderm which will further develop into the gut tube. Bellairs R. (1953b). Gardner R. L. (1984). endstream
759 0 obj ." It lines all glands that open into the digestive tube, including the pancreas and liver, as well as the follicles of the thymus, which produces T-lymphocytes or T-cells, and the thyroid gland, which produces a number of important regulatory hormones.
endobj 1 Oct. 2020
Differentiation of the embryonic disc, amnion, and yolk sac in the rhesus monkey. © 2019 Encyclopedia.com | All rights reserved. In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Adv. Primitive endoderm cells predominantly give rise to the endoderm layers of the visceral and parietal yolk sacs, which are two extra-embryonic membranes crucial for the transport of nutrients to the developing embryo and, in egg-laying amniotes, the handling of metabolic waste (Sheng and Foley, 2012). The Oxford Pocket Dictionary of Current English. (October 1, 2020). Bellairs R. (1953a). A Dictionary of Biology. By the fifth week, the endoderm has already differentiated into organs. respiratory and digestive epithelium. ectoderm endoderm mesoderm none of the above. . Encyclopedia.com. 764 0 obj The hypoblast is a tissue type that forms from the inner cell mass during early embryonic development. . Pick a style below, and copy the text for your bibliography. ." The primitive streak. <> Then, copy and paste the text into your bibliography or works cited list. Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. From the inside out, the three cell layers are the endoderm, the mesoderm , and the ectoderm . endoderm. —endodermal (en-doh-der-măl) adj.
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