ORBIT.

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Bones of the Skull.

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Presentation transcript:

ORBIT

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Lacrimal Gland Sympathetics: From: To: T1. Superior cervical ganglion.

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