Sensory Systems III - Eye Flashcards
What is the cavity in the skull where the eye is housed called?
orbit
What are the three main components of the eye?
1) optical apparatus
2) neural apparatus
3) supportive tissues
What are some of the components of the optical apparatus?
- cornea
- aqueous humor
- iris
- lens
- vitreous body
What does the neural apparatus consist of?
retina and optic nerve
What do the supportive tissues of the eye consist of?
sclera and conjunctiva
What are the three main layers of the eye?
1) fibrous layer
2) vascular layer
3) inner layer
What does the fibrous layer (tunica fibrosa) consist of?
sclera (white of the eye) and cornea
What kind of tissue does the sclera consist of?
collogenous connective tissue
What pole of the sclera is the thickest and what is it perforated by?
posterior pole
blood and lymphatic vessels and nerves
What is the posterior zone of the sclera where the optic nerve exits the eye called?
lamina cribrosa
What is the zone of transition between the sclera and cornea called?
limbus
Which surface of the eye does the cornea cover?
anterior (exterior) surface of the eye
What are the three components of the cornea?
- corneal epithelium
- corneal stroma
- endothelium
In the cornea, what is a thin stratified squamous epithelium five or six cells thick, with a basement membrane called Bowman’s membrane?
corneal epithelium
In the cornea, what is the middle layer constituting about 90% of the corneal
thickness, composed of lamellae (layers) of collagen fibers and fibroblasts?
corneal stroma
In the cornea, what is a simple cuboidal epithelium lining the inner face of the cornea, with a basement membrane called Descemet’s membrane?
endothelium
What gives the corneal stroma its transparency?
- parallel arrangement and tight compression of its fibers within each lamella
- gel of glycosaminoglycans (GAGs) between lamellae