Muscles of the orbit, stability of the eye, nerves of the orbit (dave's notes) Flashcards
List the extraocular muscles
Superior, inferior, medial and lateral recti
Superior and inferior oblique
Levator palpebrae superioris
Orbitalis
What are the nerves to the extraocular muscles?
LR6 abducent nerve
SO4 trochlear
O3 all the others by the third/oculomotor
List the cranial nerves
1 Olfactory 2 Optic 3 Oculomotor 4 Trochlear 5 Trigeminal 6 Abducens 7 Facial 8 Vestibulocochlear 9 Glossopharyngeal 10 Vagus 11 Accessory 12 Hypoglossus
What ensures stability of the eye? Where are the fascial attachments? What pierces this fascia?
The fascial sheath is applied like a bursa to the back of the eyeball from corneoscleral junction to the optic nerve insertion.
The inner layer is thin, the outer layer is pierced by the four tendons of the recti.
What suspends the eye? How does the eye rotate?
A suspensory ligament. Rotates around a fixed axis.
Where does the second cranial nerve enter the orbit?
Through the apex
What enters through the superior orbital fissure?
The nerves of the extraocular muscles and the three branches of the opthalmic nerve (7)
What nerves enter through the cavernous sinus?
The main nerves ???? Optic nerve?
What enters via the inferior orbital fissure?
The infraorbital and zygomatic branches pass through the pterygopalatine fossa and then through the infraorbital fissure
What are the roots and branches of the ciliary ganglion?
Roots: Sensory - nasociliary nerve Sympathetic - Cavernous plexus Parasympathetic - Relay Branches: Short ciliary nerves to the sclera supply the ciliary body for accommodation and the sphincter pupillae
Vessels of the orbit
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Movements of the eyes
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structure of the eye and refracting media
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