Lacrimal System
Name three facts about the meibomian glands.
1. Embedded in the tarsal plates 2. Form most of the lipid layer in the tear film 3. More abundant in the superior eyelid
The horizontal portion of the lacrimal canaliculi is:
8 mm long
Where is Horner's muscle located?
Around the openings of tarsal glands
Where is the lacrimal gland located in relation to the orbital septum?
Behind the orbital septum
According to recent research, sympathetic fibers reaching the lacrimal gland will target?
Blood vessels Secretory acini
Which is the origin of the parasympathetic fibers that innervate the lacrimal gland?
CN VII
Lesion of which of the following nerves or ganglia will have the largest impact in tear secretion?
Greater petrosal nerve
Which heads of the o.o. Insert into the lacrimal sac and thus are involved in tear suction?
Horner's Jone's
Where does the sebaceous gland of Zeis drain?
In the hair follicle (provides oil to eyelashes)
Where are the tarsal glands (meibomian) located?
In the tarsal plate of the upper eyelid
Where do the secretomotor (parasympathetic) fibers to the lacrimal gland enter the orbit?
Inferior orbital fissure
Secretion from which glands forms the aqueous layer of the tear film?
Krause (fornix) and Wolfring (palpebral) Main lacrimal
Miebomitis (inflammation of tarsal glands) will affect tear film, most likely, by interfering with the production of which of the following components?
Lipid layer
What glands are the main contributor to the lipid layer of the tear film?
Meibomian (aka tarsal) glands
What type of gland is the ciliary gland of Moll?
Modified apocrine gland
Where is the sebaceous gland of Zeis?
Near the eye lid margin
Where is the ciliary gland of Moll located?
Near the eyelid margin
What does the sebaceous gland of Zeis secrete?
Oil
Which part of a the main lacrimal gland can be observed if the superior eyelid is retracted or exerted?
Palpebral lobe
What does the ciliary gland of Moll secrete?
Produces sweat
The chief function of the lipid layer of the tear film is to:
Reduce evaporation
What do the tarsal glands (meibomian) secrete?
Secrete the lipid layer of tear film
What does the fornix lacrimal glands of Krause secrete?
Serous and mucous
what does the palpebral lacrimal glands of Wolfring secrete?
Serous and mucous
Where do the ducts of the main lacrimal gland open?
Superior conjunctival fornix
Can facial nerve palsy cause tear epiphora?
YES
Where is the lacrimal gland located?
lacrimal fossa of frontal bone
What divides the lacrimal gland into the orbital and palpebral lobes?
levator aponeurosis (lateral horn)
