Phenotype: primary motor neuron morphology, abnormal
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
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: morphology
Synonyms:
Definition: A quality of a single physical entity inhering in the bearer by virtue of the bearer's size or shape or structure.
Ontology: Phenotypic Quality Ontology [PATO:0000051]