orbit - THE ORBIT Supraorbital foramen Posterior ethmoidal foramen Superior orbital fissure anterior ethmoidal foramen Greater wing of sphenoid Optic

orbit - THE ORBIT Supraorbital foramen Posterior ethmoidal...

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THE ORBIT
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Infraorbital foramen Orbital plate of maxilla . Supraorbital foramen . Superior orbital fissure Posterior ethmoidal foramen anterior ethmoidal foramen Greater wing of sphenoid Optic canal Zygomatic .
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Nose, medial Infraorbital groove Inferior Orbital fi ssure Orbital plate of ethmoid Lacrimal bone Orbital plate of frontal bone The frontal process of the maxilla
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Lateral wall: Formed by : the zygomatic bone and the greater wing of the sphenoid Roof : Formed by: The orbital plate of the frontal bone , which separates the orbital cavity from the anterior cranial fossa and the frontal lobe of the cerebral hemisphere Bony orbit
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Medial wall : Formed from before backward by: The frontal process of the maxilla The lacrimal bone The orbital plate of the ethmoid (which separates the orbital cavity from the ethmoid sinuses) The body of the sphenoid Floor : Formed by : the orbital plate of the maxilla , which separates the orbital cavity from the maxillary sinus of the orbit is formed principally by the orbital plate of the ethmoid bone This paper thin , rectangular plate covers the middle and posterior ethmoidal air cells , providing a route by which infection can spread into the orbit
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- 1Supraorbital notch ( Foramen :) It transmits the supraorbital nerve and blood vessels - 2Infraorbital groove and canal: Situated they transmit the infraorbital nerve (a continuation of the maxillary nerve) and blood vessels . Openings Into the Orbital Cavity
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- 3Inferior orbital fissure: Located posteriorly between the maxilla and the greater wing of the sphenoid it communicates with the pterygopalatine fossa . It transmits 1 - the maxillary nerve and its zygomatic branch 2 - the inferior ophthalmic vein and sympathetic nerves . - 4Nasolacrimal canal: Located anteriorly on the medial wall; it communicates with the inferior meatus of the nose It transmits the nasolacrimal duct .
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- 5Superior orbital fissure : Located between the greater and lesser wings of the sphenoid it communicates with the middle cranial fossa . It transmits the lacrimal nerve the frontal nerve the trochlear nerve the oculomotor nerve ( upper and lower divisions ) the abducent nerve, the nasociliary nerve the superior ophthalmic vein . 6 - Optic canal : Located in the lesser wing of the sphenoid it communicates with the middle cranial fossa . It transmits the optic nerve and the ophthalmic artery The annulus of Zinn
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The common tendinous ring is a fibrous ring which surrounds the optic canal and part of the superior orbital fissure at the apex of the orbit , and gives origin to the four recti The optic nerve ophthalmic artery enter the orbit via the optic canal, and so lie within the common tendinous ring The superior and inferior divisions of the oculomotor nerve The nasociliary branch of the ophthalmic nerve The abducens nerve also enter the orbit within the common tendinous ring, but they do so via The superior orbital fissure
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The trochlear nerve The frontal lacrimal branches of the ophthalmic nerve all enter the orbit through the superior orbital fissure but lie outside the common tendinous ring
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  • Fall '16
  • oculomotor nerve, superior orbital fissure, lacrimal nerve

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