Histology of Eyelid Flashcards
What type of gland are meibomian glands?
Sebaceous, holocrine
What is the function of the meibomian glands?
Produce meibum (the lipid layer of the tear film)
What type of gland are zeis glands?
Sebaceous, holocrine
What is the function of the zeis glands?
To keep the cilia supple
What type of gland are moll glands?
Specialized apocrine (sweat)
What is the function of the moll glands?
Unknown, perhaps immune defense
What type of gland are accessory lacrimal glands?
Merocrine
What is the function of the accessory lacrimal glands?
Produce aqeous layer of the tear film
What are the two types of accessory lacrimal glands and where is each found?
Krause–located near fornix; Wolfring, near the tarsal plate
What is a common cause of meibomian gland loss?
Long-term CL wear
An external hordeolum is caused by an infection of which gland?
Zeis or Moll gland
An internal hordeolum is caused by an infection of which gland?
Meibomian
True or false: a chalazion is caused by an infection
False, it is an inflammatory nodule involving the meibomian gland
What are the two layers of the palpebral conjunctiva?
Stratified columnar non-keratinized epithelium; stroma (submucosa)
From which cells is mucin released, and where are those cells located?
Goblet cells, located in the palpebral conjunctiva epithelial layer
What is the name for conjunctival edema?
Chemosis
What is the name for increased redness of the conjunctiva?
Conjunctival injection
What role does vitamin A have in terms of the conjunctiva, and what might happen if it were deficient?
It keeps the conjunctival epithelium healthy; without it, keratinization and conincident loss of goblet cells would occur
What role does glycocalyx have in terms of the conjunctiva?
It provides wettability to the ocular surface
