- Brachiocephalic artery
Name = PAGENAME
Latin = truncus brachiocephalicus
GraySubject = 142
GrayPage = 548
Caption = Schematic of the proximal aorta, frontal view. The brachiocephalic artery (labeled "innominate") is the third branch of the aorta and the first branch from the arch of the aorta. The
heartin the lower left is not shown.
Caption2 = The veins of the thyroid gland.
BranchFrom = aortic arch
BranchTo = right
common carotid artery
subclavian artery thyreoidea ima
MeshName = Brachiocephalic+Veins
MeshNumber = A07.231.908.130
DorlandsPre = t_20
DorlandsSuf = 12825973
The brachiocephalic artery (or brachiocephalic trunk or
innominateartery) is an arteryof the mediastinumthat supplies blood to the right armand the headand neck.
It is the first branch of the aortic arch, and soon after it emerges, the brachiocephalic artery divides into the right
common carotid arteryand the right subclavian artery.
There is no brachiocephalic artery for the left side of the body. The left common carotid, and the left subclavian artery, come directly off the aortic arch. However, there are two
It arises, on a level with the upper border of the second right
costal cartilage, from the commencement of the arch of the aorta, on a plane anterior to the origin of the left carotid; it ascends obliquely upward, backward, and to the right to the level of the upper border of the right sternoclavicular articulation, where it divides into the right common carotidand right subclavianarteries.
Anteriorly, it is separated from the
manubrium sterniby the Sternohyoideusand Sternothyreoideus, the remains of the thymus, the left innominate and right inferior thyroid veins which cross its root, and sometimes the superior cardiac branches of the right vagus. Posterior to it is the trachea, which it crosses obliquely.
On the right side are the right
innominate vein, the superior vena cava, the right phrenic nerve, and the pleura; and on the left side, the remains of the thymus, the origin of the left common carotid artery, the inferior thyroid veins, and the trachea.
The innominate artery usually gives off no branches, but occasionally a small branch, the thyreoidea ima, arises from it. Other times, it gives off a thymic or bronchial branch.
The thyreoidea ima (a. thyreoidea ima) ascends in front of the trachea to the lower part of the thyroid gland, which it supplies.
It varies greatly in size, and appears to compensate for deficiency or absence of one of the other thyroid vessels. It occasionally arises from the
aorta, the right common carotid, the subclavianor the internal mammary.
Wikimedia Foundation. 2010.