neuromuscular junction neuromuscular junction of myotube cellular_component A neuromuscular junction in which the target muscle cell is a myotube. GO:0098523 In vertebrates, the term 'neuromuscular junction' is limited to synapses targeting the myotubes of skeletal muscle (AKA skeletal muscle fibers). Neuromuscular junctions targeting other muscle cell types exist in invertebrates such as the mononucleate somatic muscles of nematodes. 2013-10-14T12:05:12Z dos