Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Schematic drawing of the superior hypophyseal arteries (SHAs) (arrows), the prechiasmal artery (arrowhead) from the right ophthalmic artery, and the internal carotid arteries, viewed from below (A). In this case (B), the anastomoses between the left SHA and the right prechiasmal artery via the right SHA may enable the right orbit to be supplied by the contralateral internal carotid artery.
