The Carnett’s Sign is a clinical examination sign used to distinguish between abdominal wall pain (Pain arising from the abdominal musculature) and pain arising from within the abdomen (Visceral pain from abdominal/pelvic organs).

The Celiac Trunk is responsible for the blood supply of the Stomach, Liver, Pancreas, Spleen and the 1st and 2nd parts of the Duodenum. It is a branch of the the Abdominal Aorta, and is at the T12 Vertebral level

The external iliac artery is a major pelvic artery that continues as the femoral artery. It supplies the lower limb and gives off inferior epigastric and deep circumflex iliac branches.

The Inferior Mesenteric Artery is a branch of the Abdominal Aorta, which supplies the Hindgut. It exits at the L3 level at runs slightly lateral to the Abdominal Aorta.

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.

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