| Phenotype: | secondary motor neuron axon decreased size, 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: | secondary motor neuron |
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| Synonyms: | secondary motoneuron |
| Definition: | Motor neurons that develop several hours later than primary motoneurons and sprout axons several hours after the primary motor growth cones have extended to the periphery. They have smaller cell bodies and are located more ventrally and laterally in the spinal cord than primary motoneurons. Axons usually project directly out of the spinal cord with no apparent contact with the Mauthner axon and are positioned lateral to the Mauthner axon in their path to the ventral root. Secondary motoneurons have smaller fields, which can overlap one another, and innervate many fewer muscle fibers than primary motoneurons. |
| Ontology: | Anatomy Ontology [ZFA:0009247] |
| Name: | axon |
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| Synonyms: | |
| Definition: | The long process of a neuron that conducts nerve impulses, usually away from the cell body to the terminals and varicosities, which are sites of storage and release of neurotransmitter. |
| Ontology: | GO: Cellular Component [GO:0030424] QuickGO AmiGO |
| Name: | decreased size |
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| Synonyms: | hypoplasia, small, tiny, underdeveloped |
| Definition: | A size quality which is relatively low. |
| Ontology: | Phenotypic Quality Ontology [PATO:0000587] |