L2 Lids & Lashes Anatomy

Jessica

what muscle of the eyelid is the main protractor of the eyelid originating from canthal tendons

orbicularis oculi

what muscle of the eyelid is responsible for the eyelid closure, blink, drainage of tears and MG secretion

orbicularis oculi

what are the 3 portions of the orbicularis oculi muscle

orbital, preseptal, pretarsal

orbicularis oculi- orbital portion

orbicularis oculi- preseptal portion

orbicularis oculi- pretarsal portion

orbicularis oculi- riolan muscle

what are the two roles of riolans muscle

-position the puncta
-contract the MG for secretion

what is located between the preseptal tissue and the orbit

orbital septum

what kind of tissue is the orbital septum made of

thin fibrous

the orbital septum begins in ___ ___ and fuses with eye lid retractors

arcus marginalis

orbital is anterior to

orbital fat

cellulitis is classified based on location relative to the orbital septum so

preseptal =

anterior to the orbital septum

cellulitis is classified based on location relative to the orbital septum so

orbital=

posterior to the orbital septum

what is the purpose of orbital fat

serves as barrier between eyelid and orbit by limiting spread of infection & bleeding

what is blepharoplasty surgery for

removal of excess fat, muscle and skin from eyelids

what complication can occur from blepharoplasty on the removal of medial fat pad

its close proximity to the trochlea can lead to superior oblique palsy and brown syndrome

which muscle is the primary retractor of upper eyelid

LPS

muller muscle is under parasympathetic or sympathetic innervation

sympathetic

muller muscles is responsible for ____ mm of vertical elevation of upper eyelid

1-2

_____ _____ affects sympathetic output, resulting in mild ptosis of the upper lid and reverse ptosis of the lower lid

horners syndrome

tarsus/ tarsal plate

function of tarsal plate

provide structure and contain MG

Meibomian glands are the site for inflammation leading to (2)

chalazion & internal hordeolum

what does MG dysfunction lead to

dry eye syndrome

what is the mucous membrane lining the inner surface of the eyelid

conjunctiva

what are two lacrimal accessory glands

wolfring and krause

does the conjunctiva contain lacrimal accessory glands

yes as well as goblet cells

eyelid margin contains which 3 types of glands

zeis- sebaceous

moll- sweat

MG- sebaceous

inflammation of more external gland of zeis=

external hordeolum

inflammation of MG=

internal hordeolum

what is the normal flora of the eyelid margins

coagulase negative staph & s. aureus