Session 8 - Eye lids and lacrimal apparatus Flashcards
what strengthens and gives the eyelids their shape
tarsal plates - dense bands of connective tissue
what is the name of the glands within the tarsak plates
meibomian glands
function of glands in tarsal plates
meibomian glands- oily secreyios from these glands lubricate the edge of the eyelids and mix the tear film over the surface of the eye oreventing tears from evaporating too quickly
what happens when the meibomian glands block
meibomian cys
what causes a stye
infected eyelash folicle or sebaceous gland
what does the lacromal apparatus consist of
lacrimal glands- secrete lacrimal fluid
lacrimal ducts
lacromal canaliculi
where do lacrimal glands lie
in a fossa on the superolateral part of the orbit
what nerve innervates the lacrimal gland
facial nerve
parasympathetically
pathway of lacrimal fluid
lacrimal gland
lacrimal punctum
lacrimal canaliculi
nasolacrimal duct
inferior meatus of nasal cavity
What muscle closes the eyelid
orbicularis oculi innervated by the facial nerve
what muscle opens the eyelid
levator palpebrae superiosis
innervated by oculomotor nerves CN III
what leads to partial ptosis
some of the deep fibres of the LPS are smooth muscle fibres innervated by the sympathetic nervous system
pathology interrupting the sympathetic innervation to the eye leads partial ptosis- partial because the LPS has somatic innervation also
