| 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: | membrane |
|---|---|
| Synonyms: | integral component of membrane, integral to membrane, membrane region, region of membrane, whole membrane |
| Definition: | A lipid bilayer along with all the proteins and protein complexes embedded in it and attached to it. |
| Ontology: | GO: Cellular Component [GO:0016020] QuickGO AmiGO |