Anterior view of aortic arch anomaly where right and left aortic arches persist completely, as in the frog, forming an aortic ring through which pass the esophagus and trachea.

Coronal MRI of the thorax at the level of the superior vena cava. The image to the right indicates the level of each coronal MRI.

Illustration of anterior relations of thoracic part of esophagus from superior to inferior. Shown are the aorta, trachea, right and left bronchi, inferior tracheo-bronchial lymph nodes, and diaphragm.

Left medial view of the mediastinum after the left lung has been removed. The costal and mediastinal pleurae have mostly been removed as well.

Aortic arch anomaly where each of four arteries originates independently from the arch. Shown are: brachiocephalic trunk, right subclavian artery, right common carotid artery, left common carotid artery, left subclavian artery, and left vertebral artery

Anterior view of aortic arch anomaly where left common carotid artery originates high on the brachiocephalic trunk. Also shown are right subclavian artery, right common carotid artery, and left subclavian artery.

Anterior view of aortic arch anomaly where right subclavian artery arises as the last branch of the arch of the aorta, passing posteriorly to the esophagus and trachea.

Illustration of aortic arch anomaly where two brachiocephalic trunks originate from the arch, then branch into the right subclavian artery, right common carotid artery, and left subclavian artery, left common carotid artery.

Superior view of the cervical vertebrae, showing (on the left) the atlas (top), axis (middle), C3 (bottom); (on the right) C4 (top), C5 (2nd), C6 (3rd), C7 (4th).

Inferior view of the circle of Willis which provides the arterial blood supply to the brain (internal carotid arteries, posterior communicating arteries and posterior cerebral arteries).

Simple drawing of anterior view of the arch of the aorta and the many branches of arteries which arise from the thoracic aorta to provide arterial blood supply to the trachea and esophagus.

Carotid artery, bird