Orbit Flashcards
Which bones contribute to the orbit?
Frontal Zygomatic Maxilla Lacrimal Ethmoid Sphenoid Palatine
Where is the common tendinous ring located?
Surrounds the optic canal and a portion of superior orbital fissure
Which muscles control movement of the eyeball?
Superior rectus Inferior rectus Medial rectus Lateral rectus Superior oblique Inferior oblique
Which muscle is responsible for elevating the superior eyelid?
Levator palpebrae superioris
Which cranial nerves pass through the common tendinous ring?
Oculomotor nerve
Abducent nerve
Which cranial nerve bypasses the common tendinous ring?
Trochlear nerve
Where do the rectus muscles originate?
Common tendinous ring
Where do the rectus muscles insert?
Sclera - anterior to equator of the eyeball
Where does superior oblique originate?
Body of sphenoid bone
Where does superior oblique insert?
Sclera - posterior to equator of the eyeball
What structure redirects superior oblique? Where does it attach?
Trochlea/tendinous pulley
Frontal bone
Redirects SO backwards to its insertion
Where does inferior oblique originate?
Orbital surface of maxilla (anterior aspect of orbit)
Where does inferior oblique insert?
Sclera - posterior to equator of the eyeball
Where does levator palpebrae superioris originate?
Lesser wing of sphenoid bone
Where does levator palpebrae superioris insert?
Superior eyelid
