Ch 4. Eyelids Flashcards
When are the lacrimal glands formed?
Between 8-9th gestation weeks
When do the eye lids fuze together?
During the 9th gestational week.
What are the glands of zeiss and moll?
Zeiss are holocrine sebaceous glands the secrete their content into the eyelash conduct. Mill glands are modified apocrine sweat glands the secrete into the eyelash follicule or directly to the skin.
When do the lids separate?
Begins during the 20th week and takes 3 whole weeks.
What is the Riolan’s muscle and its function?
It is formed by the marginal fibers of the orbital muscle. It holds the lacrimal punctum against the eye.
What is the normal average excursion for both upper and lower eye lids?
Upper: 10-14mm Lower: 4-5mm
Where is the Muller’s muscle and what is it’s function?
It is located under the upper eyelid’s levator muscle, attaches to the superior border of the tarsus and provides a basal 1-2mm of excursion, which can increase during sympathetic excitational states.
Which nerve provides neural input to eyelids?
Orbicularis: VII Levator superioris: III Inferior depressor:III Horner and inferior retractor fibers: sympathetic
Where are the lacrimal Glands of Krause and wolfring located?
In the conjunctiva, mainly in the fornices.
Where are the upper eyelid’s fat pads and what complications are associated with their excision?
2 fat pads: preaponeurotic (between the levator’s aponeurosis and septum) Medial adjacent to the troclea, medial palpebral artery and infratroclear nerve. It is associated to brown’s syndrome, and superior oblique palsy
