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ORBIT

ORBIT. Bones of Orbit: Roof. Bones: Frontal bone . Lesser wings of sphenoid . Related to: Frontal cerebral lobes. Special features: Fossa for lacrimal gland. Bones of Orbit: Floor. Bones: Maxilla . Zygomatic . Related to: Maxillary sinus. Special features:

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ORBIT

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  1. ORBIT

  2. Bones of Orbit: Roof • Bones: Frontal bone. Lesser wings of sphenoid. • Related to: Frontal cerebral lobes. • Special features: Fossa for lacrimal gland.

  3. Bones of Orbit: Floor • Bones: Maxilla. Zygomatic. • Related to: Maxillary sinus. • Special features: Infraorbital groove and canal: Infraorbital nerve. Infraorbital artery.

  4. Bones of Orbit: Medial Wall • Bones: Ethmoid. Lacrimal. Frontal. Sphenoid. • Related to: Ethmoid air cells. Sphenoid sinus. Nasal cavity.

  5. Bones of Orbit: Medial Wall • Special features: Fossa for lacrimal sac. Opening for nasolacrimal canal.

  6. Bones of Orbit: Lateral Wall • Bones: Zygomatic. Greater wing of sphenoid. Frontal. • Related to: Temporal fossa.

  7. Eye • External features: Conjunctiva. Eyelids: Tarsal plates. Tarsal glands. Lacrimal apparatus: Lacrimal papilla and puncta. Lacrimal canaliculi and sac. Nasolacrimal duct.

  8. Openings into Orbit • Superior orbital fissure: Cranial nerves: III. IV. V-1 (ophthalmic branch). Frontal. Lacrimal. Nasociliary. VI. Superior ophthalmic vein.

  9. Openings into Orbit • Optic canal: CN II. Ophthalmic artery. • Anterior and posterior ethmoidal foramina:

  10. Openings into Orbit • Inferior orbital fissure: Cranial nerves: V-2: (maxillary branch): Zygomatic branch. Orbital branches. Infraorbital nerve.

  11. Openings into Orbit • Nasolacrimal duct. • Infraorbital groove: Infraorbital nerve. • Supraorbital notch: Supraorbital nerve.

  12. Extrinsic Muscles of the Eye • Common annular tendon. • Superior oblique: CN IV. • Inferior oblique: CN III. • Superior rectus: CN III. • Inferior rectus: CN III.

  13. Extrinsic Muscles of the Eye • Medial rectus: CN III. • Lateral rectus: CN VI. • Levator palpebrae superioris: CN III.

  14. Intrinsic Muscles of the Eye • Parasympathetics: From: Edinger-Westphal nucleus. To: Ciliary ganglion. To: Sphincter pupillae.

  15. Intrinsic Muscles of the Eye • Sympathetics: From: T1. To: Superior cervical ganglion. To: Dilator pupillae: Wraps around carotid artery.

  16. Lacrimal Gland • Parasympathetics: From: Lacrimal nucleus: Via CN VII. To: Sphenopalatine ganglion. To: Lacrimal gland: Via CN V.

  17. Lacrimal Gland • Sympathetics: From: T1. To: Superior cervical ganglion. To: Lacrimal gland.

  18. Sensory Supply to Orbit • Optic nerve. • Lacrimal nerve. • Frontal nerve. • Nasociliary nerve. • Branches of V-2.

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