The OA terminates in two branches, the supratrochlear (or frontal) artery and the dorsal nasal artery. Both exit the orbit medially to supply the forehead and scalp.
Which are the blood vessels that supply the eyeball?
The arterial input to the eye is provided by several branches from the ophthalmic artery, which is derived from the internal carotid artery in most mammals (Fig 2.2, left). These branches include the central retinal artery, the short and long posterior ciliary arteries, and the anterior ciliary arteries.
What are the veins of the orbit?
Orbital Veins Vortex Veins: Venous drainage of the uveal tract and pierce the sclera posterior to the equator of the globe. Superior vortex veins (lateral and medial) drain into the superior ophthalmic vein and the inferior vortex veins (lateral and medial) drain into the inferior ophthalmic vein.
How do I remember the branches of my ophthalmic artery?
A useful mnemonic to remember the branches of the ophthalmic artery is: DR MCLESSI Mnemonic D: dorsal nasal artery R: (central) retinal artery M: muscular artery C: ciliary arteries (long, short and anterior) L: lacrimal artery E: ethmoidal arteries (anterior and posterior) S: supraorbi…
What is ophthalmic vein?
Ophthalmic veins are veins which drain the eye. More specifically, they can refer to: Superior ophthalmic vein. Inferior ophthalmic vein.
What are the arteries into which the ophthalmic artery is divided at the medial corner of the eye?
The medial palpebral arteries: arise just superior to the trochlea, usually divided into superior and inferior branches for the upper and lower eyelid, respectively. Supratrochlear artery: one of the two terminal branches of the ophthalmic artery.
What is the innermost layer of the eye called?
retina
The inner layer is the retina, which lines the back two-thirds of the eyeball.
What nerve is under your eye?
The optic nerve (a cranial nerve), which carries impulses from the retina to the brain, as well as other cranial nerves, which transmit impulses to each eye muscle, travel through the orbit (the bony cavity that surrounds the eyeball).
Where is the inferior ophthalmic vein?
orbit
The inferior ophthalmic vein begins as a plexus near the anterior floor of the orbit. It drains blood from the lower and lateral muscles, the inferior conjunctiva, the lacrimal sac, and the inferior vortex veins.
What is inferior orbital fissure?
The inferior orbital fissure (IOF) lies in the floor of the orbit inferior to the superior orbital fissure and it is bounded superiorly by the greater wing of sphenoid, inferiorly by maxilla and orbital process of palatine bone and laterally by the zygomatic bone. It opens into posterolateral aspect of orbital floor.
What is in the circle of Willis?
The Circle of Willis is the joining area of several arteries at the bottom (inferior) side of the brain. At the Circle of Willis, the internal carotid arteries branch into smaller arteries that supply oxygenated blood to over 80% of the cerebrum.
Where does inferior ophthalmic vein pass through?
superior orbital fissure
The inferior ophthalmic vein courses through the superior orbital fissure, just below the common tendinous ring (annulus of Zinn). It either drains directly into the cavernous sinus, or into the superior ophthalmic vein.
