The external carotid arteries
supply blood to the face, neck and scalp.
The styloglossus muscle arises from the anterior and lateral surface of the styloid process near the apex and descends forward between the branches of the internal and external carotid arteries
. It then divides upon the lateral side of the tongue to blend with the fibers of the longitudinalis inferior linguae muscle and obliquely with the hyoglossus muscle.
(2) The carotid artery can be followed from the clavicular level cephalic to its bifurcation and proximal 3-4 cms of internal and external carotid arteries
can be studied.
The atypical imaging features of the intravagal paraganglioma included inferior extension to the level of the carotid bifurcation and splayigg of the internal and external carotid arteries, features that are similar to those seen in a case of carotid body paraganglioma.
The tumor extended inferiorly to the level of the carotid bifurcation and splayed the internal and external carotid arteries, which draped over the mass's anteromedial and posterolateral surfaces (figure 1, A and B).
The tract then passes medially deep between the internal and external carotid arteries
, after crossing over the glossopharyngeal and hypoglossal nerves.
The mass was found to be supplied by both the internal and external carotid arteries
Carotid color doppler revealed absent flow in left internal and external carotid arteries
with atherosclerotic changes and soft plaques in bilateral internal carotid arteries.
The dissection was difficult to perform because of the partial tumor encasement; as a consequence, the common, internal, and external carotid arteries
ultimately had to be sacrificed.
Accurate diagnosis is based on angiographic criteria, the most reliable of these being the separation and splaying of internal and external carotid arteries
(known as the lyre sign).
The vertebral arteries and the right internal and external carotid arteries
were patent and normal.
Type III The cyst passes between the internal and external carotid arteries
and extends to the pharngeal wall.