31/07/2026
The Omentum:
The omentum is a large, apron-like fold of peritoneum heavily infiltrated with adipose tissue, blood vessels, lymphatics, and immune cells that drapes from the stomach and transverse colon over the intestines — most prominently as the greater omentum — and serves functions so diverse that surgeons have nicknamed it "the policeman of the abdomen." Its vascular and immune-cell richness allows it to rapidly adhere to and wall off sites of infection, perforation, or inflammation anywhere in the abdominal cavity, physically isolating the problem and preventing the spread of contamination — a first-response containment mechanism that can convert a life-threatening generalized peritonitis into a localized abscess that is far more survivable. The omentum's adipose tissue is not passive fat storage but an active endocrine depot releasing adipokines, growth factors, and angiogenic molecules, making it a key contributor to the metabolic abnormalities of visceral obesity. Omental transfer — surgically transposing a pedicle of omentum to a distant site — is a technique used to revascularize ischemic tissue, provide blood supply to reconstructed limbs or areas of radiation injury, and seal cerebrospinal fluid leaks, exploiting its extraordinary angiogenic capacity. The omentum's ability to sense and respond to intraperitoneal danger through its milky spots (clusters of immune cells) is an evolutionarily ancient defense mechanism, and its functional importance is reflected by the adverse outcomes seen when it is removed or absent in patients subsequently developing abdominal infections.