| Term: | pectoral fin fin fold actinotrichium |
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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: | pectoral fin |
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| Synonyms: | forefin, pectoral fins |
| Definition: | Paired fin that is located in the thoracic region of the body. |
| Ontology: | Anatomy Ontology [ZFA:0001161] |
| Name: | fin fold actinotrichium |
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| Synonyms: | fin fold actinotrichia, median fin fold actinotrichium |
| Definition: | Portion of tissue which is a slender, horny, flexible, unsegmented fibril, which strengthens the embryonic fin fold. Actinotrichia are translucent, exhibit birefringence (double refraction) and are composed of the scleroprotein elastoidine. |
| Ontology: | Anatomy Ontology [ZFA:0000089] |