mesentery

Examples of mesentery in the following topics:

• Class Anthozoa

  • This cavity is divided into several chambers by longitudinal septa called mesenteries.
  • Each mesentery consists of one ectodermal and one endodermal cell layer with the mesoglea sandwiched in between.
  • Mesenteries do not divide the gastrovascular cavity completely; the smaller cavities coalesce at the pharyngeal opening.
  • The adaptive benefit of the mesenteries appears to be an increase in surface area for absorption of nutrients and gas exchange.

• Lymphatic Tissue Development

  • The next lymph sac to appear is the unpaired retroperitoneal lymph sac at the root of the mesentery of the intestine.
  • The spleen develops from mesenchymal cells between layers of the dorsal mesentery of the stomach.

• The Peritoneum

  • The term "mesentery" is often used to refer to a double layer of visceral peritoneum.
  • The structures in the abdomen are classified as intraperitoneal, retroperitoneal, or infraperitoneal depending on whether they are covered with visceral peritoneum and whether they are attached by mesenteries, such as the mensentery and mesocolon.
  • Some structures, such as the kidneys, are "primarily retroperitoneal," while others such as the majority of the duodenum, are "secondarily retroperitoneal", meaning that structure developed intraperitoneally, but lost its mesentery and thus became retroperitoneal.

• Anatomy of the Pancreas

  • In teleosts, and a few other species (such as rabbits), there is no discrete pancreas at all, with pancreatic tissue being distributed diffusely across the mesentery and even within other nearby organs, such as the liver or spleen.

• Ectopic Pregnancy

  • This is generally bowel or mesentery, but other sites, such as the renal (kidney), liver or hepatic (liver) artery or even aorta have been described.

• Body Cavity Membranes

  • The mesothelium is a membrane that forms the lining of several body cavities: the pleura (thoracic cavity), peritoneum (abdominal cavity including the mesentery) and pericardium (heart sac).