Flashcards in 3.2 Orbit Deck (50)
What part of the orbit are generally the thinest and present significant clinical threat of becoming fractured or eroded in persistent infection?
medial wall & floor
Fluid (tears) is drained from the medial corner of the eye through a small opening or ... on the medial aspect of each eyelid.
Fluid (tears) are drained from the puncture into the ... that opens into the nasal cavity?
The nasolacrimal duct opens into the nasal cavity under the ... on the lateral wall.
Each eyelid contains a semilunar plate of dense CT called a ...
Embedded in each plate are a number of ... that secrete a fatty substance keeping the lids from sticking together when closed.
The tarsal plates are anchored to the orbital margin by ...
medial and lateral palpebral ligaments
Voluntary (skeletal) muscle that raises the upper eyelid.
levator palpeerde superioris
In it's raised position, an involuntary SM is responsible for the "tone" of the eyelid. (eyelid should rest just above the iris of the eye)
superior tarsal muscle (Mueller's)
The superior tarsal muscle is innervated by ... that travel with the frontal nerve
A lesion of the SNS - superior cervical ganglion (Horner's syndrome) causes
partial ptosis (drooping of the eyelid)
What are the eye abductor muscles?
Lateral rectus (obliques)
What are the eye adductor muscles?
Medial rectus (Superior and Inferior recti)
What are the eye elevator muscles?
Superior rectus, Inferior oblique
What are the eye depressor muscles?
Inferior rectus, Superior oblique
What are the eye intortion muscles?
Superior oblique (Superior rectus)
What are the eye extortion muscles?
Inferior oblique (Inferior rectus)
How should the pt look to test SR?
abduct and look up
How should the pt look to test IR?
abduct and look down
How should the pt look to test SO?
adduct and look down
How should the pt look to test IO?
adduct and look up
The external fibrous layer of the eye is composed of the posterior 5/6 which is ... and the anterior 1/6 which is ...
sclera (white of eye) and cornea
A contractile diaphragm anterior ro the lens in the middle vascular layer of the eyeball.
What are the 2 muscles of the iris?
sphincter papillae and dilator pupillae
What is the principle blood supply to the orbit?
The ophthalmic artery is a branch of the ...
internal carotid artery
What is the relationship of the ophthalmic a. and the optic n. in the optic canal?
Ophthalmic artery travels superior to the optic nerve (army over navy)
The ophthalmic a. passes anteriorly toward the ... wall of the orbit.
The sup. and inf. ophthalmic veins exit the orbit via the...
superior orbital fissure