Subserosa of esophagus

The subserosa of oesophagus (subserous layer) is the connective tissue beneath the the serous coat (peritoneum that encloses the abdominal part of the oesophagus).

The subserosa consists of a thin layer of loose connective tissue located between the outer surface of the muscularis externa and the serosa (visceral peritoneum). This layer contains small blood vessels, lymphatics, nerves, and adipose tissue that support and supply the serosal covering. Throughout the cervical and thoracic portions of the esophagus, a distinct subserosal layer is absent because these regions are covered by adventitia rather than serosa. Consequently, the subserosa is not considered a prominent histological feature of the esophagus and is limited to the distal intraabdominal segment where it facilitates the attachment of the serosa to the underlying muscular wall.