Calot's triangle is a small triangular space at the porta hepatis of surgical importance as it is dissected during cholecystectomy. Its contents, the cystic artery and cystic duct, must be identified before ligation and division to avoid intraoperative injury.

Morrison’s Pouch is a potential space between the liver and the right kidney. It is an intraperitoneal space in the supramesocolic compartment

Chest drains are indicated in hemothorax, pneumothorax and hydrothorax. The layers encountered are essential for understanding the relevant anatomy.

The layers encountered during a Lumbar puncture, starting from the skin and going deep.

All the layers involved in a C-section, from the skin downwards.