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Esophagus: Muscularis externa

Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x

Submucosa <p>Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x</p>

Submucosa

Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x

Muscularis externa <p>Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x</p>

Muscularis externa

Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x

- Smooth muscle longitudinal section <p>Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x</p>

- Smooth muscle longitudinal section

Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x

- Skeletal muscle longitudinal section <p>Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x</p>

- Skeletal muscle longitudinal section

Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x

- Smooth muscle cross section <p>Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x</p>

- Smooth muscle cross section

Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x

- Skeletal muscle cross section <p>Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x</p>

- Skeletal muscle cross section

Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x

- Auerbach’s plexus <p>Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x</p>

- Auerbach’s plexus

Muscularis externa is formed of inner circular and outer longitudinal layers. In the upper third of the esophagus, these layers are formed of skeletal muscle, which is involved with swallowing, a voluntary action. In the middle one-third (seen here), skeletal and smooth muscles are intermixed. In the lower one-third, only smooth muscle is present. Innervation is provided by Auerbach’s plexus. 400x

Main Slide Submucosa Muscularis externa - Smooth muscle longitudinal section - Skeletal muscle longitudinal section - Smooth muscle cross section - Skeletal muscle cross section - Auerbach’s plexus