Ocular Anatomy - Lab 3 Summary of Structures Flashcards
medial canthus
Joining of the eyelids next to the nose
eyelids are in direct contact with the lacrimal lake NOT the eyeball
lateral canthus
joining of the eyelids closest to the ear
eyelids are in direct contact with the eyeball
superior palpebral suclcus
groove above the eyelid
formed by the insertion of the aponeurosis of LPS into the skin of the upper eyelid
plica semilunaris
folds of bulbar conjunctiva
forms the floor of the lacrimal lake
directly lateral to the caruncle
allows the eyeball to move fully lateraly without stretching the bulbar conj
caruncle
small pinkish elevation of modified skin in the lacrimal lake
may have fine hairs that are normally present
lacrimal lake
shallow trianular region or space between the medial canthus and the eyeball
where tears collect
tear meniscus
a strip of tear film at the junction of the upper and lower eyelid margins
limbus
junction of the cornea and sclera
palpebral conjunctiva
blood vessels will move when pushed
conj on the eyelid
bulbar conjunctiva
blood vessels will move when pushed
conj on the eyeball
fornix of the eyelids
the recess where the conjunctiva is reflected from the eyelid onto the sclera
eyelid margin
rest against the globe
contain eyelashes, the pores of the meibomian glands, mucocutaneous junction and puncta
meibomian gland openings of the eyelids
posterior to the eyelashes
anterior to the mucocutaneous junction
meibomian glands
can be seen when the lids are everted
appear as yellowish ridges
secretes the lipid layer
punctum
1 in tear drainage
medial openings leading into the lacrimal drainage system
superior and inferior
Lie on the lacrimal papilla
surrounded by a dense ring of CT and elastic fibers to keep it open
drains tears from the lake by capillary action
punctum leads to canaliculus to common canaliculus to lacrimal sac to nasolacrimal duct to inferior meatus
canaliculus
#2 in tear drainage have horizontal (2 mm) and vertical (8 mm) portions the two portions unite to form common canaliculus
common canaliculus
#3 in tear drainage the angle at which the common canaliculus enters the lacrimal sac produces a physiological valve to prevent tear and debris reflus
lacrimal sac
4 in tear drainage
nasolacrimal duct
5 in tear drainage
inferior meatus
Last in tear drainage
palpebral part of orbicularis oculi
Used to help gently close the eyelids
helps hold the eyelid margins to the eyeball
muscle of Riolan
part of the palpebral part of orbicularis oculi that helps hold the lid margins to the eyeball, to allow the puncta to drain tears from the lacrimal lake
Tarsal plates
house the meibomian glands
Glands of Zeiss
???????
Glands of Krause
secretes the aqueous layer
Glands of Wolfring
secretes the aqueous layer
Glands of Moll
???????
Lacrimal gland and its duct
located in the lacrimal fossa
secretes the watery portion of the tears
superior temporal
goblet cells
secrete the mucus component of the tear film
levator palpebrae superioris
elevates the eyelid.
insertion of its aponeurosis into the skin causes the superior palpebral sulcus
Muller’s muscle
helps to widen the palpebral fissure by about 1-2 mm
orbital septum
????
fossa for the lacrimal sac
bony structure
holds the lacrimal sac
nasolacrimal canal
bony structure holding the nasolacrimal duct
opening into nasolacrimal canal
in the floor of the maxilla
Jones Test
Fluoroscene is put in the eyes
if the patient can see the dye when blowing their nose it is a positive jones result
Controls on a slit lamp
Magnification knob oculars two wheels (one controls colors and one controls beam height) horizontal beam width control lock down screw joystick illumincation rheostat on/off switch
