
Overview: Muscularis externa
Muscularis externa of the stomach has inner oblique (an inconsistent layer), middle circular, and outer longitudinal layers; only the latter two layers are seen here. Auerbach’s plexus, located between circular and longitudinal muscle layers, provides fibers from the autonomic nervous system to muscularis externa. A serosa is the outermost tunic. 100x, 800x

Mucosa
Muscularis externa of the stomach has inner oblique (an inconsistent layer), middle circular, and outer longitudinal layers; only the latter two layers are seen here. Auerbach’s plexus, located between circular and longitudinal muscle layers, provides fibers from the autonomic nervous system to muscularis externa. A serosa is the outermost tunic. 100x, 800x

Submucosa
Muscularis externa of the stomach has inner oblique (an inconsistent layer), middle circular, and outer longitudinal layers; only the latter two layers are seen here. Auerbach’s plexus, located between circular and longitudinal muscle layers, provides fibers from the autonomic nervous system to muscularis externa. A serosa is the outermost tunic. 100x, 800x

Muscularis externa
Muscularis externa of the stomach has inner oblique (an inconsistent layer), middle circular, and outer longitudinal layers; only the latter two layers are seen here. Auerbach’s plexus, located between circular and longitudinal muscle layers, provides fibers from the autonomic nervous system to muscularis externa. A serosa is the outermost tunic. 100x, 800x

- Middle circular layer
Muscularis externa of the stomach has inner oblique (an inconsistent layer), middle circular, and outer longitudinal layers; only the latter two layers are seen here. Auerbach’s plexus, located between circular and longitudinal muscle layers, provides fibers from the autonomic nervous system to muscularis externa. A serosa is the outermost tunic. 100x, 800x

- Outer longitudinal layer
Muscularis externa of the stomach has inner oblique (an inconsistent layer), middle circular, and outer longitudinal layers; only the latter two layers are seen here. Auerbach’s plexus, located between circular and longitudinal muscle layers, provides fibers from the autonomic nervous system to muscularis externa. A serosa is the outermost tunic. 100x, 800x

- Auerbach's plexus
Muscularis externa of the stomach has inner oblique (an inconsistent layer), middle circular, and outer longitudinal layers; only the latter two layers are seen here. Auerbach’s plexus, located between circular and longitudinal muscle layers, provides fibers from the autonomic nervous system to muscularis externa. A serosa is the outermost tunic. 100x, 800x

- Neuron cell bodies
Muscularis externa of the stomach has inner oblique (an inconsistent layer), middle circular, and outer longitudinal layers; only the latter two layers are seen here. Auerbach’s plexus, located between circular and longitudinal muscle layers, provides fibers from the autonomic nervous system to muscularis externa. A serosa is the outermost tunic. 100x, 800x

- Peripheral nerves
Muscularis externa of the stomach has inner oblique (an inconsistent layer), middle circular, and outer longitudinal layers; only the latter two layers are seen here. Auerbach’s plexus, located between circular and longitudinal muscle layers, provides fibers from the autonomic nervous system to muscularis externa. A serosa is the outermost tunic. 100x, 800x

Serosa
Muscularis externa of the stomach has inner oblique (an inconsistent layer), middle circular, and outer longitudinal layers; only the latter two layers are seen here. Auerbach’s plexus, located between circular and longitudinal muscle layers, provides fibers from the autonomic nervous system to muscularis externa. A serosa is the outermost tunic. 100x, 800x

- Mesothelium
Muscularis externa of the stomach has inner oblique (an inconsistent layer), middle circular, and outer longitudinal layers; only the latter two layers are seen here. Auerbach’s plexus, located between circular and longitudinal muscle layers, provides fibers from the autonomic nervous system to muscularis externa. A serosa is the outermost tunic. 100x, 800x

Area shown in next image
Muscularis externa of the stomach has inner oblique (an inconsistent layer), middle circular, and outer longitudinal layers; only the latter two layers are seen here. Auerbach’s plexus, located between circular and longitudinal muscle layers, provides fibers from the autonomic nervous system to muscularis externa. A serosa is the outermost tunic. 100x, 800x