Orbital fissure

ORBIT

1.Optic foramen and canal - located at base of Lesser wing of sphenoid bone in middle cranial fossa; connects middle cranial fossa to orbit; contains Optic nerve (II) and Ophthalmic artery.

2. Superior Orbital fissure - located between Greater and Lesser wings of Sphenoid bone in Middle Cranial fossa; connects middle cranial fossa and orbit; contains Oculomotor (III), Trochlear (IV), Abducens (VI) nerves and Ophthalmic division of Trigeminal nerve (V1) and Ophthalmic veins.

3. Inferior Orbital fissure - located between sphenoid and maxillary bones; connects pterygopalatine fossa and infratemporal fossa to orbit; contains Infraorbital and Zygomatic nn., aa. and vv. (nerves are branches of V2).

4. Anterior and Posterior Ethmoidal Foramina - located between ethmoid and frontal bones; connect orbit and nasal cavity; contain (respectively) Anterior and Posterior Ethmoidal nn., aa., and veins (nerves are branches of V1; arteries are branches of Ophthalmic artery).

5. Supraorbital notch or foramen - located in frontal bone; connect orbit and forehead; contain Supraorbital n., a. and v.

6. Infraorbital foramen - in maxillary bone; connects orbit and face; contains Infraorbital n., a. and v.

7. Nasolacrimal duct - located in maxillary, lacrimal bones and Inferior nasal concha; connects orbit and nasal cavity; contains membranous nasolacrimal duct and tears.

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