Anatomy of the pharynx and esophagus
نویسنده
چکیده
During the development of the embryo, a process of cephalocaudal and lateral folding takes place with the result that part of the endoderm-lined cavity of the secondary or definitive yolk sac is incorporated into the embryo to form the primitive gut. In the cephalic part of the embryo, the primitive gut forms a blind ending tube, the foregut, separated from the ectodermally lined stomatodaeum by the buccopharyngeal membrane. Towards the end of the first month (23-25 days, 10-14 somite stage), the foregut comes to lie dorsal to the developing heart tube and to the developing septum transversum (developing diaphragm). Shortly afterwards (26-27 days, 20 somite stage), the buccopharyngeal membrane ruptures and the stomatodaeum becomes continuous with the foregut. The approximate relationship between the age of the embryo and the number of somites is given in Table 10.1.
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