| Name: | secondary motor neuron |
|---|---|
| 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 guidance |
|---|---|
| Synonyms: | axon chemotaxis, axon growth cone guidance, axon pathfinding |
| Definition: | The chemotaxis process that directs the migration of an axon growth cone to a specific target site in response to a combination of attractive and repulsive cues. |
| Ontology: | GO: Biological Process [GO:0007411] QuickGO AmiGO |
| Name: | process quality |
|---|---|
| Synonyms: | quality of a process, quality of occurrent, quality of process, relational quality of occurrent |
| Definition: | A quality which inheres in an process. |
| Ontology: | Phenotypic Quality Ontology [PATO:0001236] |