COA exam study (JCAHPO)
levator palpebrae superioris - -Muscle that elevates the lid -Sclera - -white opaque fibrous shell, main purpose is to protect eye -Cornea - -A transparent convex covering which protects the eye and helps focus light rays onto the retina and the back of the eye -meibomian glands - -The largest oil-secreting glands, which are embedded in the posterior connective tissue substance of the lids -Corneal Epithelium - -Part of the cornea that is usually injured by superficial abrasions or small foreign bodies. Is 5-7 cells thick and is composed of nonkeratinized stratified squamous cells. -Corneal Epithelium - -Part of the cornea that regenerates rapidly and heals without leaving a scar. -Bowman's membrane - -Consists of randomly oriented collagen fibrils of greater periodicity then the underlaying stroma. -Bowman's membrane - -Acellular layer of cornea that has no regenerative capabilities. Function is unclear. -Stroma - -Layer just under Bowman's membrane. Accounts for 90% of corneal thickness and is composed of 78% water. -Descemet's membrane - -Layer of the cornea that is composed of type III collagen, forms the basement membrane of epithelial cells. -Endothelium - -4-6um thick layer of the cornea made of 500,000 cells that maintains corneal deturgescence. No regenerative abilities. -Limbus - -The gray, semitransparent area which demarcates the junction of
the cornea and sclera. -Cornea is completely nourished by - -3 sources: A plexus of fine capillaries at the limbus, the tear film, and the aqueous humor. -Vitreous - -jelly like structure, thick and viscous, that occupies the vitreous chamber in the posterior concavity of the globe. -Lens - -A transparent biconvex structure situated between the iris and the vitreous.
levator palpebrae superioris - -Muscle that elevates the lid -Sclera - -white opaque fibrous shell, main purpose is to protect eye -Cornea - -A transparent convex covering which protects the eye and helps focus light rays onto the retina and the back of the eye -meibomian glands - -The largest oil-secreting glands, which are embedded in the posterior connective tissue substance of the lids -Corneal Epithelium - -Part of the cornea that is usually injured by superficial abrasions or small foreign bodies. Is 5-7 cells thick and is composed of nonkeratinized stratified squamous cells. -Corneal Epithelium - -Part of the cornea that regenerates rapidly and heals without leaving a scar. -Bowman's membrane - -Consists of randomly oriented collagen fibrils of greater periodicity then the underlaying stroma. -Bowman's membrane - -Acellular layer of cornea that has no regenerative capabilities. Function is unclear. -Stroma - -Layer just under Bowman's membrane. Accounts for 90% of corneal thickness and is composed of 78% water. -Descemet's membrane - -Layer of the cornea that is composed of type III collagen, forms the basement membrane of epithelial cells. -Endothelium - -4-6um thick layer of the cornea made of 500,000 cells that maintains corneal deturgescence. No regenerative abilities. -Limbus - -The gray, semitransparent area which demarcates the junction of
the cornea and sclera. -Cornea is completely nourished by - -3 sources: A plexus of fine capillaries at the limbus, the tear film, and the aqueous humor. -Vitreous - -jelly like structure, thick and viscous, that occupies the vitreous chamber in the posterior concavity of the globe. -Lens - -A transparent biconvex structure situated between the iris and the vitreous.
