Lecture 5/6- Eyelids Part 1: A and B Flashcards Preview

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Flashcards in Lecture 5/6- Eyelids Part 1: A and B Deck (114)
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which muscle is the main eyelid protractor, with the primary function of narrowing the palpebral fissure and closing the eye lids. 'it contracts medially to pump tears toward the ducts. Innervated by CN VII, orbital portion is largest part - wink, preseptal portion is for winking and blinking

Orbicularis Oculi


What part of the orbicularis oculi is resposible for horizontal movement of eyelid in order to spread tear film and pump tears toward the duct?

Pretarsal portion


size range of the palpebral fissure

12-30 mm


name for the crease of the upper lid that represents the cutaneous insertion of fibers of the levator anoneurosis into the preseptal orbicularis oculi, 8-10 mm above lashes

Superior palpebral crease


What does it mean if there is no superior palpebral crease, here the fibers of the levator palpebrae aponeurosis insert into the preseptal orbicularis oculi

No crease = no LP superioris function - as in blepharoptosis


name for the crease below the lower lid, 4-5 mm below lower lashes

inferior palpebral crease


Thin, fibrous, multilayer sheath that separates the eyelids from the orbit - functions as an anatomical barrier to protect orbit from infection, heme, edema

orbital septum


What is unique to asian populations in terms of crease position and orbital septum anatomy of upper lid

Creases in lower position than caucasians
Upper lid orbital septum can be fused to the anoneurosis as it inserts into the tarsus - as high as the superior border of the tarsus, or as low as the lashes line = lower or absent UL crease


Term for upper eyelid sin laxity that increases with age, causing a hooding effect - not the same as ptosis, can be severe, causing mechanical ptosis with or without superior visual field defect or entropion

Dermatochalasis - can interfere with visual fields if hood droops over the pupil, and entropion i the hood causes the lashes to turn inward against the globe


prominent lower lids from orbital fat, malar bags, hypertrophy, or overriding orbicularis oculi, only can be treated by blepharoplasty

"Bags" under the eye


What could be a secondary condition developed after an elderly person has surgery to remove the excess skin present in dermatochalasis?

eye lid could not be able to close - lagophthalmos


Retractors of the upper eyelid

Levator palpebrae superior and superior tarsal muscle of Muller


Lower eye lid retractors

capsulopalpebral fascia and inferior tarsal


disease with weakness of tarsus elastin fibers

Floppy Eyelid syndrome


Arteries supplying upper eyelid that branch from the ophthalmic artery, which branches from ICA

Lacrimal, Supraorbital, Supratrochlear, Dorsal nasal


What artery supplies the superficial arterial system (facial and angular arteries) that supplies the lower lid

External Carotid artery


Artery supplying lacrimal gland, conjunctiva, lateral upper eyelid, terminates as lateral palpebral artery

Lacrimal artery


Artery supplying upper eyelid, scalp, forehead, levator muscle, periorbita, diploe of frontal lobe

Supraorbital artery


Artery supplying skin of superior medial aspect of the orbit, forehead, and scalp

Supratrochlear artery


Artery supplying nose bridge skin, lacrimal sac, terminates as medial palpebral artery

Dorsal nasal artery


Eye lid venous drainage review

drains through tributaries of ophth vein, and superficially through superficial temporal and angular (superficial frontal and supraorbital and supratrochlear)


Vein with dual drainage - deep by superior opth, and superficial by anterior facial vein

Angular vein


Vein that empties into common facial vein, that empties into external jugular

Angular vein


Which lymphatic system drains the skin and orbicularis oculi

superficial system


which lynphatic system drains that tarsi and conjunctiva, upper lid, later half of LL and lateral canthus

Deep system - into the preauricular and deep parotid nodes


Nerves of the eyelids

3, 5, 7


Viral infections causing skin lesions along a V1 dermatome, and a lesion on the tip of the nose - Hutchison's sighn - with associated kerato uveitis. Typically, involvement of nasociliary nerve is seen.

Herpes Zoster Ophthalmicos


glands at the coruncula and within eyebrow hars, associated with periocular skin vellus - thin hairs

Sebaceous - holocrine glands


modified sebaceous glands at tarsal plate, each has a central duct with multiple acini to synthesize lipids for outer layer of tear film

Meibomian glands


modified apocrine sweat glands - open into a lash follicle, are more in lower lid

Moll Glands