chapter17 part1 p570-1 Flashcards
palpebrae
eyelid
What are the accessory structures of the eye?
eyelids, superficial epithelium of eye, structures involved w/ production, secretion an dremoval of tears
palpebral fissure
eye gap
medial and lateral canthus
corners of eyes
Along the inner margin of the lid- small, modified sebaceous glands
tarsal glands
tarsal gland other name
Meibomian glands
what do tarsal glands secrete?
lipid-rich prouct that helps keep eyelids from sticking together
mass of soft tissue that contains glands producing thick secretions contributing to gritty deposits after sleep
lacrimal caruncle
cyst that results from infection of tarsal gland
chalazion
painful localized swelling from from an infection in a sebaceous gland associated w/ eyelash
sty
which muscles close the eyelid? which raise the upper eyelid?
orbicularis oculi close the eyes
levator palpebrae superioris muscle raise the lids
conjunctiva
epithelium covering inner surface of eyelids and outer surface of the eyeball- mucous membrane covered by specialized stratified squamous epithelium.
covers INNER surface of the eyelids
palpebral conjunctiva
covers ANTERIOR SURFACE of the eyes
ocular conjunctiva/bulbar conjunctiva
transparent part of the outer fibrous layer of the eye
cornea
delicate squamous membrane- 5-7 cells thick, continuous w/ ocular conjunctiva covering the cornea
corneal epithelium
ocular conjunctiva extends to the edges of
cornea
what keeps ocular conjunctiva and cornea moist and clean?
constant supply of fluid washing over surface of eyeball
______ cells in epithelium assist accessory glands in lubricating surfaces of conjunctiva to prevent drying out+ causing friction
mucous
inflammation of conjunctiva
conjunctivitis
conjunctivitis
pinkeye- inflammation of conjunctiva
possible causes to redness of conjunctivitis
dilation of blood vessels deep in conjunctival epithelium-
- pathogenic infection
- physical irritation of conjunctival surface
- allergic
- chemical
lacrimal apparatus - name 5 functions of constant flow of tears
- keep conjunctival surfaces moist and clean
- reduce friction
- remove debris
- prevent bacterial infection
- provide nutrients and oxygen to portions of conjunctival epithelium
lacrimal apparatus function
produces, distributes and removes tears
Name 4 components of the lacrimal apparatus
- lacrimal gland+ducts
- paired lacrimal canaliculi
- lacrimal sac
- nasolacrimal duct
Where palpebral conjunctiva becomes continuous w/ ocular conjunctiva
fornix
lateral portion of the superior fornix receives 10-12 ducts from
lacrimal gland/tear gland
gland w/ size and shape of almond
lacrimal/tear gland
function of lacrimal gland
provide key ingredients and most of the volume of tears that bathe the conjunctival surfaces
by what mechanism does lacrimal glands supply nutrients and oxygen?
diffusion
lacrimal secretions supply nutrients and oxygen to
corneal cells
properties of lacrimal secretions
a. watery
b. slightly alkaline
c. contain antibacterial enzyme lysozyme
d. contain antibodies
once lacrimal secretions reach the ocular surface, they mix w/ the products of __________ and ________ to create an “oily slick”
accessory glands, tarsal glands
