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vena ophthalmica
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Veins of orbit
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The sinuses at the base of the skull (Superior ophthalmic vein labeled at top right)
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The , two in number, superior and inferior, are devoid of
Valves .
The Superior Ophthalmic Vein (v. ophthalmica superior) begins at the inner angle of the orbit in a vein named the
Nasofrontal which communicates anteriorly with the
Angular Vein ; it pursues the same course as the
Ophthalmic Artery , and receives tributaries corresponding to the branches of that vessel.
Forming a short single trunk, it passes between the two heads of the
Rectus Lateralis and through the medial part of the
Superior Orbital Fissure , and ends in the
Cavernous Sinus .
The Inferior Ophthalmic Vein (v. ophthalmica inferior) begins in a venous net-work at the forepart of the floor and medial wall of the orbit; it receives some veins from the
Rectus Inferior ,
Obliquus Inferior ,
Lacrimal Sac and
Eyelids , runs backward in the lower part of the orbit and divides into two branches.
One of these passes through the
Inferior Orbital Fissure and joins the
Pterygoid Venous Plexus , while the other enters the cranium through the
Superior Orbital Fissure and ends in the
Cavernous Sinus , either by a separate opening, or more frequently in common with the
Superior Ophthalmic Vein .
