Internal mammary branch

Internal thoracic artery
Right internal thoracic artery and its branches (labeled under its old name the Internal mammary artery, at upper right.)
Details
Source	Subclavian artery
Branches	Pericardiocophrenic Anterior intercostal branches Musculophrenic Superior epigastric Perforating branches
Vein	Internal thoracic vein
Identifiers
Latin	Arteria thoracica interna, arteria mammaria interna
MeSH	A07.231.114.891.525
Dorlands /Elsevier	a_61/12156309
TA	A12.2.08.029
FMA	3960
Anatomical terminology []

In human anatomy, the internal thoracic artery (ITA), previously known as the internal mammary artery (a name still common among surgeons), is an artery that supplies the anterior chest wall and the breasts. It is a paired artery, with one running along each side of the sternum, to continue after its bifurcation as the superior epigastric and musculophrenic arteries.

The internal thoracic artery arises from the subclavian artery near its origin.

It travels downward on the inside of the ribcage, approximately a centimeter from the sides of the sternum, and thus medial to the nipple. It is accompanied by the internal thoracic vein.

It runs deep to the external oblique, but superficial to the vagus nerve

After passing the sixth intercostal space, the internal thoracic artery splits into the following two terminal branches:

The internal thoracic artery is the cardiac surgeon's blood vessel of choice for coronary artery bypass grafting. The left ITA has a superior long-term patency to saphenous vein grafts and other arterial grafts (e.g. radial artery, gastroepiploic artery) when grafted to the left anterior descending coronary artery, generally the most important vessel, clinically, to revascularize.

Plastic surgeons may use either the left or right internal thoracic arteries for autologous free flap reconstruction of the breast after mastectomy. Usually, a microvascular anastomosis is performed at the second intercostal space to the artery on which the free flap is based.