| 单词 | gill cleft |
| 例句 | As in the preceding reconstruction no attempt is made to show the gill clefts, and only the dorso-ventral profile of the enteron is shown. Development of the Digestive Canal of the American Alligator The salamanders differ as regards the number of fishlike gill clefts that they all possess in their young stages, but which disappear entirely or in part during later life. The Doctrine of Evolution Its Basis and Its Scope The mouth has now broken through, putting the wide pharynx into communication with the exterior; probably the mouth opening is formed at about the time of the opening of the first gill cleft. Development of the Digestive Canal of the American Alligator The pharynx, ph, is lined with a comparatively thin epithelium and opens, on the left, at two places, one the mouth and the other the second gill cleft, g2. Development of the Digestive Canal of the American Alligator Compared to the size of the gill clefts the cavity of the pharynx is, at this stage, comparatively small. Development of the Digestive Canal of the American Alligator The gill clefts no longer communicate with the exterior. Development of the Digestive Canal of the American Alligator For the sake of simplicity the gill clefts are not represented, and the pharynx, mouth, and liver are represented in outline only. Development of the Digestive Canal of the American Alligator |
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