WEEK 6: Special senses of the eye
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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what are the 3 layers of the eye?
corneoscleral coat (outer) vascular coat (uvea) retina (inner)
what is the corneoscleral layer?
outer fibrous layer of the eye: - cornea is the transparent section - sclera is the white portion
what is the vascular coat (uvea) of the eye?
middle layer contains: - choroid - iris - ciliary body
what is the retina?
inner layer of the eye
what are the 3 layers to the sclera? What are their properties?
• episclera - thick fibrous layer with dense connective tissue • sclera proper - flat collagen bundles • lamina cribosa - pigmented, allows for entry/exit of nerves and vessels
what are the five layers of the cornea? (outer to inner layer)
• corneal epithelium • Bowman’s membrane • corneal stroma • Descemet’s membrane • corneal endothelium
what is the function of the cornea?
refraction of light structural barrier and protects against infections
what 2 muscles make up the iris?
dilator pupillae sphincter pupillae
2 muscles make up the iris. What do they lay underneath?
dilator pupillae - under is sympathetic nervous system sphincter pupillae - under parasympathetic ns
what gives eye colour?
pigmentation in the iris
what is the ciliary body?
thickened anterior body between iris and choroid
what is the function of the ciliary muscle?
changes the shape of the lens when the eye focuses secretion of aqueous humour
what is the segment called from the cornea to lens?
anterior segment
where is the post chamber?
behind the iris to lens
what is the section named between the iris and cornea?
anterior chamber
what is the canal of schlemm (scleral venous sinus)
little opening which allow aq humour to escape. Allows decrease in pressure of the eye so optic nerve is not affected.
what is the vitreous body?
transparent jelly-like substance in posterior segment of the eye. maintains shape of the eye and keeps retina in place.
what are the 2 layers of the retina?
neural retina (retina proper) retina pigment epithelium (RPE)
where does retinal detachment occur?
outer segments of rods and cones
what vision are rods and cones for?
rods - black and white cones - colour vision
what’s the clinical correlation of the vitreous body?
composition can change with age resulting in vitreous detachment and retinal detachment
what’s the clinical correlation of rods?
night blindness
what’s the clinical correlation of cones?
colour blindness
how many rods in eye?
~120 million