| Term: | extension ionocyte |
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| Note: | This page represents a term created by the combination ("post-composition") of two ontology terms. For more information on the individual terms, click the hyperlinked name. |
| Name: | extension |
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| Synonyms: | yolk extension |
| Definition: | The posterior elongated region of the yolk cell that forms during the segmentation period. |
| Ontology: | Anatomy Ontology [ZFA:0000106] |
| Name: | ionocyte |
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| Synonyms: | |
| Definition: | Specialized epithelial cells involved in the maintenance of osmotic homeostasis. They are characterized by abundant mitochondria and ion transporters. In amniotes, they are present in the renal system. In freshwater fish, ionocytes in the skin and gills help maintain osmotic homeostasis by absorbing salt from the external environment. |
| Ontology: | Anatomy Ontology [ZFA:0005323] |