| Phenotype: | primary motor neuron decreased functionality, 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: | primary motor neuron |
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| Synonyms: | primary motoneuron |
| Definition: | Motor neurons that arise during the first day of development. Primary motoneurons have larger diameter cell bodies and axons than secondary motoneurons and are positioned more dorsally and medially than secondary motoneurons. Primary motoneurons are present in a single bilateral pair of clusters in each spinal segment and innervate axial muscle fibers in the corresponding pair of myotomes. Axons make a conspicuous loop around the Mauthner axon before entering the ventral root. |
| Ontology: | Anatomy Ontology [ZFA:0009244] |
| Name: | decreased functionality |
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| Synonyms: | dysfunction, dysfunctional, having decreased function, impaired, lacks function of type, low functionality, partial functionality |
| Definition: | A functionality quality held by the bearer when the latter exhibits decreased ability to perform a regular function(s). |
| Ontology: | Phenotypic Quality Ontology [PATO:0001624] |