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)