Eyelids Flashcards
how many main layers does the eyelid have?
5
what are the 5 main layers of the eyelid, from superficial to deep?
- skin + subcutaneous tissue
- orbicularis oculi - muscle
- tarsal plates
- levator apparatus
- conjunctiva
what does the subcutaneous layer of the eyelid not contain? what is the consequence of this?
subcutaneous fat
- thus, they are readily distended by oedema or blood
name the accompanying sweat glands of the eyelashes?
the ciliary glands of Moll
where are the eyelashes attached?
superficial layer of the eyelids - skin and subcutaneous tissue
name the sebaceous glands located in the skin and subcutaneous tissue
glands of Zeis
what 3 things are found in the skin and subcutaneous tissue of the eyelids?
- eyelashes
- glands of Moll
- glands of Zeis
what are the 3 distinct parts of the orbicularis oculi muscle?
- palpebral
- lacrimal
- orbital
what are the actions of the orbicularis oculi?
- palpebral - gently closes eyelids
- lacrimal - drains the tears
- orbital - tightly closes eyelids
what is the innervation of the orbicularis oculi>
facial nerve
superior tarsus
upper eyelid
inferior tarsus
lower eyelid
where are the tarsal plates located?
deep to the palpebral region of the orbicularis oculi
what are the tarsal plates composed of?
dense connective tissue
what glands lie within the tarsal plates?
Meibomian glands
