Inferior ophthalmic vein is one of the two veins that drain the orbital cavity and structures within it.
The inferior ophthalmic vein begins in a venous network in the anterior part of the floor of the orbit. This venous network is formed by the following veins;
- Vorticose veins
- Veins from Inferior rectus muscle and Inferior oblique muscle
- Veins from lacrimal sac
- Veins from eyelids
The inferior ophthalmic vein then runs backward in the inferior part of the orbit and divides into two branches;
- One of these branches passes through the inferior orbital fissure and joins the pterygoid venous plexus.
- The other branch passes through the superior orbital fissure and ends in the cavernous sinus with the superior ophthalmic vein.