part of part of superficial to contributes to morphology of myenteric nerve plexus stomach muscularis externa stomach smooth muscle outer longitudinal layer The most superficial layer of the muscularis; it has two sections, a longitudinal layer that is common with the esophagus and ends in the corpus, and a longitudinal layer that originates in the corpus and spreads into the duodenum. longitudinal layer of gastric muscularis UBERON:0008863 outer longitudinal muscle layer of stomach FMA:14910 stratum longitudinale (tunica muscularis)(gaster) stratum longitudinale tunicae muscularis gastricae muscle layer 1 of stomach EMAPA:37966 longitudinal muscle layer of muscular coat