Some vortex veins drain into the superior ophthalmic vein which drains into the cavernous sinus. Some vortex veins drain into the inferior ophthalmic vein which drains into the pterygoid plexus and cavernous sinus. There is usually collateral circulation between the superior and inferior orbital veins.
What do the vortex veins drain into?
The vorticose veins, more commonly referred to as vortex veins, drain the ocular choroid. Some empty into the cavernous sinus through the superior orbital veins, whereas others drain into the pterygoid plexus through the inferior orbital veins.
What is vortex vein ampulla?
Vortex vein ampulla varicosities are asymptomatic, harmless, findings in the retina. They are incidentally picked up on routine eye examination or when presenting for unrelated ocular symptoms.
Where do the ophthalmic veins drain into?
The superior and inferior ophthalmic veins drain into the pterygoid venous plexus and cavernous sinus. The cavernous sinus drains posteriorly into the petrosal sinuses (superior and inferior). The superior petrosal sinus connects to the transverse and sigmoid sinus.What is the venous drainage of the eye?
Venous drainage It is formed when the supraorbital and angular veins unite just behind the trochlea (pulley like structure). The veins that drain into it are named as the arteries of the region (medial palpebral, lacrimal, anterior ethmoidal, inferior ophthalmic, central retinal and muscular).
Where is the uveal tract located?
The middle layer of the wall of the eye.
What does the facial vein drain into?
The facial vein (along with the facial artery) pierces the deep investing fascia of the neck just below the border of the mandible where it unites with the anterior branch of the retromandibular vein to form the common facial vein, which empties into the internal jugular vein 1,2,3.
Where does the cavernous sinus drain?
Cavernous sinuses drain the blood from the orbits through the ophthalmic veins and from the anterior part of the base of the brain by the sphenoparietal sinus and the middle cerebral veins. They empty into both the superior and inferior petrosal sinuses and ultimately into the internal jugular veins.What is Vortex vein?
The vorticose veins, referred to clinically as the vortex veins, drain the ocular choroid. The number of vortex veins is known to vary from 4 to 8 with about 65% of the normal population having 4 or 5. … However, the veins run posteriorly in the sclera exiting the eye well posterior to the equator.
What does superior ophthalmic vein drain?The superior ophthalmic vein drains the orbit. These include the superior rectus muscle, the medial rectus muscle, the lacrimal gland, and the retina. The inferior ophthalmic vein also helps to drain the orbit.
Article first time published onWhat is ora serrata in human eye?
The ora serrata is the peripheral termination of the retina and lies approximately 5 mm anterior to the equator of the eye. … The ora serrata is approximately 2 mm wide and is the site of transition from the complex, multilayered neural retina to the single, nonpigmented layer of ciliary epithelium.
What is the pars plana of the eye?
The pars plana is a narrow section of the ciliary body, inflammation of which is known as pars planitis. In association with the inflammation or immunological response, fluid and cells infiltrate the clear gelatin-like substance (vitreous humor) of the eyeball, near the retina and/or pars plana.
What is eye equator?
The equator of the eyeball is the virtual line corresponding to the greatest circumference of the eyeball equidistant between the anterior and posterior poles.
At which of the following locations do blood vessels and nerves enter or exit the eye?
The rest of the retina provides side (peripheral) vision, which allows you to see shapes but not fine details. Blood vessels (retinal artery and vein) travel along with the optic nerve and enter and exit through the back of the eye.
Where is the macula in the eye located?
A macular hole is a small break in the macula, located in the center of the eye’s light-sensitive tissue called the retina. The macula provides the sharp, central vision we need for reading, driving, and seeing fine detail.
Why does a person suffer from night blindness?
Vitamin A deficiency is one of the most common causes of night blindness. An insufficient amount of vitamin A in the body affects the production of rhodopsin, the necessary pigment for night vision. Night blindness is usually one of the first signs of a vitamin A deficiency.
Where does facial vein drains directly?
The common facial vein descends superficial to the loop of the lingual artery, the hypoglossal nerve and external and internal carotid arteries, and goes on to drain into the internal jugular vein, roughly at the level of the hyoid bone.
Where does external jugular vein drain?
[2] The external jugular vein most commonly drains into the subclavian vein near the middle third of the clavicle. Like most veins, the external jugular vein has a valve at the terminal end before entering the subclavian vein.
Where does internal jugular vein drain into?
The tributaries of the internal jugular include the inferior petrosal sinus, facial, lingual, pharyngeal, superior and middle thyroid, and, occasionally, the occipital vein. The blood collected from these vessels then drains to the brachiocephalic vein and into the right atrium.
Where is ciliary muscle?
The ciliary muscle is elongated, triangular in shape, and located beneath the anterior sclera just posterior to the limbus. The shortest side of the triangular region faces anterior-inward and it is to this region of the ciliary body that the base of the iris inserts.
Why is it called uveal tract?
The uveal tract, or simply uvea, is the pigmented middle membrane of the layers that make up the eye. The uveal tract is also called the vascular tunic of the eye because it is rich in its blood supply – i.e., vascular – and because it envelops the eye like a tunic would cover a body.
What part does the uveal tract play in posterior segment inflammation?
Intermediate uveitis is inflammation in the middle of the uveal tract, and typically also involves the jellylike substance that fills the eyeball (called the vitreous humor). Posterior uveitis is inflammation in the back of the uveal tract and can involve the retina and choroid.
Why is choroid black?
The choroid forms the uveal tract, which includes the iris and the ciliary body. The dark-colored melanin pigment in the choroid absorbs light and limits reflections within the eye that could degrade vision. 1 The melanin is also thought to protect the choroidal blood vessels against light toxicity.
What is central retinal vein?
The central retinal vein (retinal vein) is a short vein in the retina of the eye. It travels through the optic nerve to drain into either the superior ophthalmic vein or the cavernous sinus. It drains blood from the retina.
Where do veins come from?
Veins are a type of blood vessel that return deoxygenated blood from your organs back to your heart. These are different from your arteries, which deliver oxygenated blood from your heart to the rest of your body. Deoxygenated blood that flows into your veins is collected within tiny blood vessels called capillaries.
Where is Meckel's cave?
Results: Meckel’s cave is a natural mouth-shaped aperture connecting with the posterior fossa that is located in the medial portion of the middle cranial fossa.
Where does the transverse sinus drain?
The transverse sinuses are formed by the tentorium cerebelli and drain into the right and left sigmoid sinuses. The transverse sinuses (left and right lateral sinuses), within the human head, are two areas beneath the brain which allow blood to drain from the back of the head.
Where does the superior petrosal sinus drain?
The superior petrosal sinus is one of the dural venous sinuses and drains the cavernous sinus. It courses posterolaterally to drain into the sigmoid sinus at the continuation of the transverse sinus. It runs along the superior aspect of the petrous temporal bone.
Where does the pterygoid plexus drain into?
Drains fromVenules of the infratemporal fossaDrains toMaxillary vein
Which vein communicates with the superior ophthalmic vein?
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.
Where is the angular vein?
Gross Anatomy The angular vein runs obliquely downward along with the angular artery, on the side of the root of the nose, to the level of the lower margin of the orbit, where it becomes the facial vein (previously called the anterior facial vein) 2.
