What is apex of orbit?
The orbital apex is anatomically the posterior part of the orbit positioned at the craniofacial junction located where the four orbital walls converge. The orbital apex incorporates the optic canal and the superior orbital fissure.
What causes orbital apex syndrome?
Orbital apex syndrome can be caused by viral, bacterial, fungal and parasitic infections which result from contiguous infections of the paranasal sinuses (as is seen in Figure 4A and B) or other surrounding structures.
What place is Fissura Orbitalis superior?
The superior orbital fissure is a bony cleft found at the orbital apex between the roof and lateral wall. It is a communication between the orbital cavity and middle cranial fossa and is bounded by the greater wing, lesser wing and body of sphenoid.
What is apex syndrome?
Orbital apex syndrome is defined as the simultaneous dysfunction of the optic nerve and the cranial nerves (manifesting with vision loss, ptosis, and a complete internal and external ophthalmoplegia) as a result of a process occurring in the region of the optic canal and the superior orbital fissure (orbital apex).
What is common tendinous ring?
The common tendinous ring, also known as the annulus of Zinn, or annular tendon, is a ring of fibrous tissue surrounding the optic nerve at its entrance at the apex of the orbit. It is the common origin of the four recti muscles of the group of extraocular muscles.
What is orbital pseudotumor?
Orbital pseudotumor is the swelling of tissue behind the eye in an area called the orbit. The orbit is the hollow space in the skull where the eye sits. The orbit protects the eyeball and the muscles and tissue that surround it. Orbital pseudotumor does not spread to other tissues or places in the body.
Is Tolosa Hunt Syndrome hereditary?
Migraine headaches usually involve one side of the head like the Tolosa-Hunt syndrome. Individuals who suffer from these intense headaches may have a genetic predisposition to them.
What passes through Fissura Orbitalis superior?
Numerous structures pass through the SOF: the oculomotor (III) and trochlear nerves (IV), the ophthalmic division of the trigeminal nerve (VI) with its frontal, lacrimal, and nasociliary branch, the abducens nerve (VI), and both the ophthalmic veins, superior and inferior.
What passes through Fissura Orbitalis inferior?
the infraorbital vessels, which travel down the infraorbital groove into the infraorbital canal and exit through the infraorbital foramen. the inferior division of the ophthalmic vein….
| Inferior orbital fissure | |
|---|---|
| Latin | Fissura orbitalis inferior |
| TA98 | A02.1.00.084 |
| TA2 | 489 |
| FMA | 54802 |
What is the cavernous sinus?
The cavernous sinus is part of the brain’s dural venous sinus and contains multiple neuro-vasculatures. It is situated bilaterally to the sella turcica and extends from the superior orbital fissure anteriorly to the petrous part of the temporal bone posteriorly, and is about 1 cm wide and 2 cm long.
What passes through tendinous ring?
Through it (from superior to inferior) pass: superior division of the oculomotor nerve (CN III) nasociliary nerve (a branch of the ophthalmic nerve) inferior division of the oculomotor nerve (CN III)
What muscles attach to the common tendinous ring?
The ring blends with the dural sheath of the optic nerve, medially. The common tendinous ring provides attachment for all four rectus muscles.
What might be one of the earliest symptoms of cavernous sinus thrombosis?
Symptoms of cavernous sinus thrombosis include:
- a sharp and severe headache, particularly around the eye.
- swelling and bulging of the eye(s) and the surrounding tissues.
- eye pain that’s often severe.
- double vision.
- a high temperature.
Is Tolosa-Hunt syndrome serious?
Typically, the prognosis for Tolosa-Hunt syndrome is considered good. Patients usually respond to corticosteroids, and spontaneous remission can occur, although permanent ocular motor deficits may remain. Relapse can occur in as many as 40% of patients successfully treated for Tolosa-Hunt syndrome.
Is Tolosa-Hunt syndrome an autoimmune disease?
While the exact cause of Tolosa-Hunt syndrome is unknown, one theory is an abnormal autoimmune response linked with an inflammation in a specific area behind the eye (cavernous sinus and superior orbital fissure).