Term: primary motor neuron axon terminus
Note: This page represents a term created by the combination ("post-composition") of two ontology terms. For more information on the individual terms, click the hyperlinked 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: axon terminus
Synonyms: axon terminal, axon terminal specialization, motor endplate, nerve ending
Definition: Terminal inflated portion of the axon, containing the specialized apparatus necessary to release neurotransmitters. The axon terminus is considered to be the whole region of thickening and the terminal button is a specialized region of it.
Ontology: GO: Cellular Component [GO:0043679]   QuickGO   AmiGO