Notes in 04 Anatomy: Skull, Cranial Cavity, Orbit, and Eye

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Published 04/24/2024 A blow to the globe will most likely fracture the {{c1::floor}} of the orbit (formed by the {{c1::maxilla::bone}}) and result in {{c2::diplopia}}.&nbs…
Published 04/24/2024 The {{c1::common tendinous ring}} surrounds the optic canal and part of the superior orbital fissure, and serves as a common origin for most of the ex…
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Published 04/24/2024 Levator palpebrae superiorisInnervation: {{c1::CN III (oculomotor)}}Function: {{c2::Elevation of upper eyelid}}
Published 04/24/2024 Superior rectusInnervation: {{c1::CN III (oculomotor)}}Function: Elevation, adduction, medial rotation of eyeball
Published 04/24/2024 Inferior rectusInnervation: {{c1::CN III (oculomotor)}}Function: Depression, adduction, lateral rotation of eyeball
Published 04/24/2024 Medial rectusInnervation: {{c1::CN III (oculomotor)}}Function: {{c2::Adduction of eyeball}}
Published 04/24/2024 Lateral rectusInnervation: {{c1::CN VI (abducent)}}Function: {{c2::Abduction of eyeball}}
Published 04/24/2024 Superior obliqueInnervation: {{c1::CN IV (trochlear)}}Function: Depression, abduction, {{c2::medial (internal)}} rotation of eyeball
Published 04/24/2024 Inferior obliqueInnervation: {{c1::CN III (oculomotor)}}Function: Elevation, abduction, {{c2::lateral (external)}} rotation of eyeball
Published 04/24/2024 When the eye is in the abducted position...Elevated by: {{c1::Superior rectus}}Depressed by: {{c1::Inferior rectus}}
Published 04/24/2024 When the eye is in the adducted position...Elevated by: {{c1::Inferior oblique}}Depressed by: {{c1::Superior oblique}}
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Published 04/24/2024 The {{c1::tarsal plates}} are thickened bands of connective tissue within the eyelids which serve as points of attachment for the {{c2::tarsal}} muscl…
Published 04/24/2024 The superior tarsal muscles are {{c1::smooth::skeletal/smooth}} muscle and are innervated by {{c1::sympathetics from the superior cervical ganglion}}
Published 04/24/2024 {{c1::Orbicularis oculi}} acts as a sphincter to close the eyes
Published 04/24/2024 Orbicularis oculi consists of an inner {{c1::palpebral}} portion and outer {{c1::orbital}} portion
Published 04/24/2024 Orbicularis oculi innervation:Upper eyelid: {{c1::Temporal branch of CN VII}}Lower eyelid: {{c1::Zygomatic branch of CN VII}}
Published 04/24/2024 The {{c1::palpebral}} portion of orbicularis oculi is located within the eyelid, superficial to the fat within the orbit, and is responsible for {{c2:…
Published 04/24/2024 The {{c1::orbital}} portion of orbicularis oculi is located superficial to the bones of the orbital rim (frontal, maxilla, zygomatic), and is responsi…
Published 04/24/2024 Presentation of CN {{c4::III}} Lesion:-Inability to {{c1::open}} affected eye (due to unapposed action of {{c1::orbicularis oculi}})-{{c2::Mydriasis}}…
Published 04/24/2024 Presentation of CN {{c2::VI}} Lesion:-{{c1::Adduction}} of eye
Published 04/24/2024 {{c1::Ptosis}} (drooping of eyelid) would result from a loss of {{c2::sympathetic}} nerve supply to the {{c3::superior tarsal}} muscle
Published 04/24/2024 Presentation of CN {{c2::IV}} Lesion:-{{c3::Extorted}} eye (due to unopposed action of {{c3::inferior oblique}})-Patient will tilt head {{c1::away fro…
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Published 04/24/2024 The {{c1::bulbar conjunctiva}} is an invisible clear membrane which contains vasculature and covers the anterior surface of the sclera
Published 04/24/2024 The bulbar conjunctiva reflects in the corners of the eye to from the conjunctival fornices and continues onto the inner surface of the eyelids as {{c…
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Published 04/24/2024 The {{c1::trochlear nerve (CN IV)}} can be seen diving into the {{c2::superior oblique}} close to the tendinous ring
Published 04/24/2024 The {{c1::abducent nerve (CN VI)}} can be seen diving into the {{c2::lateral rectus}}
Published 04/24/2024 The long and short ciliary nerves are branches of the {{c2::nasociliary}} nerve and both carry:-General sensory fibers from {{c3::CN V1}}-Po…
Published 04/24/2024 The {{c1::ethmoidal}} branches of the nasociliary nerve are responsible for the action of sneezing in response to bright light
Published 04/24/2024 The {{c1::long}} ciliary nerve branches are generally located on the {{c2::medial}} side of the optic nerveThe {{c1::short}} ciliary nerve branches ar…
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Published 04/24/2024 The ophthalmic veins drain posteriorly through the {{c1::superior orbital fissure}} into the {{c1::cavernous sinus}}
Published 04/24/2024 Cranial neves {{c1::III, IV, and VI}} pass through the cavernous sinus on their way to the superior orbital fissure
Published 04/24/2024 The ophthalmic artery arises from the {{c1::internal carotid}} and passes through the {{c2::optic canal}} to reach the orbit
Published 04/24/2024 The {{c1::central retinal}} artery arises from the {{c2::ophthalmic}} artery and gives arterial supply to the retina
Published 04/24/2024 The lacrimal nerve is a branch of {{c1::V1}} which provides sensory innervation and does not actually inervate the lacrimal gland
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Published 04/24/2024 The ophthalmic nerve (CN V1) splits into the {{c1::nasociliary, frontal, and lacrimal}} nerves as it enters the orbit
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