Its descending portion is divided into thoracic and abdominal parts; it is also composed of an ascending portion and arch.
At its origin, it presents three small dilations known as its sinuses. Its lumen narrows forming an isthmus prior to the ductus, beyond which it presents a fusiform dilation which His referred to as its spindle. A large dilation in it is known as its bulb, and a severe narrowing of it is often referred to as coarctation. Its descending portion is divided into thoracic and abdominal parts; it is also composed of an ascending portion and arch. Originating in the left ventricle, FTP, name this largest artery of the human body.
At its origin, it presents three small dilations known as its sinuses.
{aorta}