Block10-1/Fig 1. 93W6748 Esophagus, middle portion, human, H&E.

block10-1_05.jpg - Fig 1. 93W6748 Esophagus, middle portion, human, H&E.The portion of the alimentary canal that extends from theproximal part of the esophagus to the distal part of the analcanal is a hollow tube of varying diameter. This tube has thesame basic structural organization throughout its length. Its wallis formed by four distinctive layers. From the lumen outward,they are mucosa (M), submucosa (S), muscularis externa(ME) and adventitia (or serosa). Adventitia or serosaconstitutes the outermost layer of the alimentary canal. Theadventitia (A) consists of loose connective tissue containing themajor vessels (V) and nerves. However, the serosa is a serousmembrane consisting of a layer of simple squamous epithelium,called the mesothelium, and a small amount of underlyingconnective tissue.

Fig 1. 93W6748 Esophagus, middle portion, human, H&E. The portion of the alimentary canal that extends from the proximal part of the esophagus to the distal part of the anal canal is a hollow tube of varying diameter. This tube has the same basic structural organization throughout its length. Its wall is formed by four distinctive layers. From the lumen outward, they are mucosa (M), submucosa (S), muscularis externa (ME) and adventitia (or serosa). Adventitia or serosa constitutes the outermost layer of the alimentary canal. The adventitia (A) consists of loose connective tissue containing the major vessels (V) and nerves. However, the serosa is a serous membrane consisting of a layer of simple squamous epithelium, called the mesothelium, and a small amount of underlying connective tissue.

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