|Artery: Costocervical trunk|
|The internal carotid and vertebral arteries. Right side. (Costo-cervical labeled at bottom left.)|
|Gray's||subject #148 585|
Passing backward, it splits into the deep cervical artery and the supreme intercostal artery (or the Highest intercostal artery), which descends behind the pleura in front of the necks of the first and second ribs, and anastomoses with the first aortic intercostal (3rd posterior intercostal artery).
In the first intercostal space, it gives off a branch which is distributed in a manner similar to the distribution of the aortic intercostals.
The branch for the second intercostal space usually joins with one from the highest aortic intercostal artery.
This branch is not constant, but is more commonly found on the right side; when absent, its place is supplied by an intercostal branch from the aorta.
Each intercostal gives off a posterior branch which goes to the posterior vertebral muscles, and sends a small spinal branch through the corresponding intervertebral foramen to the medulla spinalis and its membranes.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.