| Phenotype: | pharyngeal arch 1 neural crest decreased amount, abnormal |
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| Note: | This statement combines anatomy and/or ontology terms with phenotype quality terms to create a complete phenotype (EQ) statement. For detailed information on individual terms, click the hyperlinked term name. |
| Name: | pharyngeal arch 1 |
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| Synonyms: | mandibular arch, visceral arch 1 |
| Definition: | The first pharyngeal arch, also known as the mandibular arch, forms the jaw. The first pharyngeal arch gives rise to elements of the jaw, with the most anteriorly positioned cranial neural crest cells contributing to mandibular arch structures, including Meckel's and palatoquadrate cartilages that constitute the lower and upper jaw respectively. |
| Ontology: | Anatomy Ontology [ZFA:0001612] |
| Name: | neural crest |
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| Synonyms: | |
| Definition: | A cell population arising from the dorsolateral aspect of the central nervous system primordium during the segmentation period, and later migrating along stereotyped pathways to give rise to a diverse and well-defined set of cell types including pigment cells, peripheral neurons and glia, and head cartilage. |
| Ontology: | Anatomy Ontology [ZFA:0000045] |
| Name: | decreased amount |
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| Synonyms: | decreased, decreased number, present in fewer numbers in organism, reduced, subnumerary |
| Definition: | An amount which is relatively low. |
| Ontology: | Phenotypic Quality Ontology [PATO:0001997] |