Orbit, eyelid, lacrimal Flashcards
orbital roof made of
frontal bone
lesser wing of sphenoid
lateral wall made of
zygomatic bone
greater wing of sphenoid
medial wall made of
ethmoid bone
lacrimal bone
maxillary bone
sphenoid bone
floor made of
maxillary bone
palatine bone
zygomatic bone
ethmoidal foramina
what goes thru anterior ethnmoidal foramina
posterior?
anterior = anterior ethmoidal artery
posterior = posterior ethmoidal artery
root for infection/malignancy
superior orbital fissure
separates?
transmits what?
separates greater/lesser wings of sphenoid
transmit CN 3, 4, 6, CN V part
superior ophthalmic vein
nasolacrimal canal
houses
extends from where to where
houses nasolacrimal duct which allows tears to drain nasally
from lacrimal sac to inferior meatus of nose
7 layers of eyelid
1) skin and subq tissue
2) muscles of protraction = orbicularis oculi/CN 7
3) orbital septum= thin multilayered fibrous tissue protect against infection/trauma
4) orbital fat
5) muscles of retraction upper and loewr eyelid
- upper = levator/superior tarsal
- lower = inferior tarsal, capsulopalpebral fascia
6) tarsus = dense plate of connective tissue
7) conjunctiva= orbit to cover interior eyelid
what is the lacrimal canaliculi/ducts
what is the lacrimal puncta
small channels in each eyelid which conduct tears
puncta = minute orifices where lacrimal ducts comence
what are meibomian glans
what are lacrimal glands
meibomian = sebaceous gland in eyelid; prevent rapid tear evap
lacrimal = superior, lat orbi; secrete aqueous part of tear
what are glands of zeiss
what is the whitnall’s ligament
sepcialized sebacious glands for eyelids in margin
support ligament of rupper eyelid/superior orbit for levator
what is muller muscle
what is lockwood’s ligament
help raise upper eyelid; smooth muscle joining levator
supports eye inferiorly and prevents downward displacement; forms hammock below
what are parasinal sinuses
1) maxillary
2) frontal
3) ethmoid
4) sphenoid
what is the annulus of zinn
ring of fibrous tissue around optic nerve
origin for 5 of the EO muscles
what is blood supply
- primary?
- secondary
- drained by?
primary = ophthalmic artery off internal carotid
secondary = facial/maxillary artery = branch of external carotid
drained by ophthalmic vein
what are extraocular muscles
( LR6 SO4 ) 3