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Omental bursa

Learning objectives:

This study unit will help you to:

1. Learn what exactly is the omental bursa and its anatomical position.
2. Learn about the structure and function of the omental bursa.
3. Identify the organs and neurovascular structures that are related to the omental bursa.

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The omental bursa is a large peritoneal recess located in the abdomen, posterior to the stomach and the lesser omentum. It is also known as the lesser sac, in contrast to the main and larger part of the peritoneal cavity which is referred to as the greater sac. These two cavities are connected by the epiploic foramen (of Winslow). The size of the omental bursa varies greatly, mainly due to the volume of the organs that make up its walls.

This video tutorial will provide you with a comprehensive overview of the omental bursa.

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Browse atlas


Key points about the omental bursa
Definition Omental bursa (lesser sac) is a hollow space formed by the greater and lesser omentum and its adjacent organs.
Walls Anterior: hepatogastric ligament, posterior surface of stomach, posterior layers of the lesser and greater omenta
: transverse colon, transverse mesocolon, pancreas, left adrenal gland, and the upper end of the left kidney, abdominal aorta, coeliac trunk, diaphragm
Borders Superior: extends between esophagus and ligamentum venosum
: from gastrosplenic ligament to duodenum
: gastrosplenic ligament, spleen, phrenicosplenic ligament
: epiploic foramen, lesser omentum, greater sac
Recesses Superior omental recess
Inferior omental recess
Splenic recess

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