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39 Cards in this Set
- Front
- Back
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Where does the optic vesicle evaginate from in week 4?
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from the forebrain
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Surface ectoderm of the optic vesicle induces what to form?
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lens placode
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Invagination of the lens placode forms what?
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optic cup and choroid fissure
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What is the posterior 4/5 of the optic cup called?
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pars optica retinae
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What is the anterior 1/5 of the optic cup called?
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pars ceca retinae
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What does the pars optica retinae become?
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retina
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What are the 3 layers of the pars optica retinae?
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pigment layer
neural layer intraretinal space |
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What encloses the hyaloid artery?
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choroid fissure
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What does the pars ceca retinae become?
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iris and ciliary body
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The lens placode invaginates, loses contact with the surface at week (a.) and forms (b.)
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(a.) week 5
(b.)lens vesicle |
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What comes from the mesenchyme of the eye?
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choroid and sclera
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The choroid is continuous with what meninge of the brain?
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pia mater
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The sclera is continuous with what meninge of the brain?
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dura mater
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What are the 3 layers of the cornea?
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epithelial layer--surface ectoderm
stromal layer-- cont with sclera epithelial layer-- from mesenchyme |
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Choroid fissure fails to close/fuse in area where iris forms.
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Coloboma iridis
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opaque lens; genetic; rubella infection
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congenital cataracts
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small eyeball; intrauterine cytomegalovirus or rubella infaction; may be due to trisomy 13
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micropthalmia
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The otic vesicle forms the structures of the inner ear that are involved in what?
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balance & hearing
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The otic placode is a thickening of surface ectoderm that comes about when?
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week 4
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Invagination of the otic placode forms what?
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otic vesicle
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membraneous labyrinth
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dorsal portion of the otic vesicle
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utricle
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dorsal portion of the otic vesicle
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3 semicircular canals
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dorsal portion of the otic vesicle
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endolymphatic duct
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dorsal portion of the otic vesicle
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saccule
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ventral portion of the otic vesicle
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cochlear duct
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ventral portion of the otic vesicle
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spiral organ of corti
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ventral portion of the otic vesicle
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The mesenchyme surrounding the otic vesicle forms a(n) (a.) and ossifies to form (b.)
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(a.) cartilagenous otic capsule
(b.) bony labyrinth of inner ear |
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The middle ear includes which bones?
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incus, malleus and stapes
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The external acoustic meatus is part of the ......ear?
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external
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What is another name for the tympanic membrane?
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eardrum
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What are the 3 layers of the tympanic membrane?
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ectodermal layer
endodermal layer middle layer of connective tissue |
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Where is the ectodermal layer of the eardrum from?
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cleft 1
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Where is the endodermal layer of the eardrum from?
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pouch 1
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What are the auricles?
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mesenchymal swellings
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Where do the mesenchymal swellings "come from?"
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3 from arch 1 and 3 from arch 2
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Often associated with serious abnormalities such as trisomy 18 or trisomy 13
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auricular abnormalities
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may be due to abnormalities of inner or middle ear or both
rubella infection or genetic |
congential deafness
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What are three anomalies that are associated with rubella?
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congenital deafness
congenital cataracts micropthalmia |
