Adventitia

Anterior Cerebral Artery

Artery formed by the bifurcation of the internal carotid artery (CAROTID ARTERY, INTERNAL). Branches of the anterior cerebral artery supply …

Aorta, Abdominal

The aorta from the DIAPHRAGM to the bifurcation into the right and left common iliac arteries.

Aorta, Thoracic

The portion of the descending aorta proceeding from the arch of the aorta and extending to the DIAPHRAGM, eventually connecting to the ABDOM…

Arterioles

The smallest divisions of the arteries located between the muscular arteries and the capillaries.

Arteriovenous Anastomosis

A vessel that directly interconnects an artery and a vein, and that acts as a shunt to bypass the CAPILLARY BEDS. Not to be confused with SU…

Axillary Artery

The continuation of the subclavian artery; it distributes over the upper limb, axilla, chest and shoulder.

Axillary Vein

The venous trunk of the upper limb; a continuation of the basilar and brachial veins running from the lower border of the teres major muscle…

Azygos Vein

A vein which arises from the right ascending lumbar vein or the vena cava, enters the thorax through the aortic orifice in the diaphragm, an…