The tear forms a new channel between the inner and outer layers of the aortic wall.

In human anatomy, the layers of the abdominal wall are (from superficial to deep):

The various layers of the abdominal wall are opened.

Each layer of the abdominal wall is then closed in turn.

Opening a belly for example, and knowing how the layers of the abdominal wall will cleave under the line of the knife.

The white line is the inner layer of the wall.

The three layers of the wall merge in a single mass and they grow downwards together.

Also, as the body ages, the outer layer of the intestinal wall thickens, causing the open space inside the colon to narrow.

There are three layers of the abdominal wall.

These develop because Crohn's disease causes inflammation and ulcers in the deep layers of the intestinal wall.