chapter 17 review Flashcards
defn the optic disc
Circular region just medial to fovea
Origin of optic nerve
No photoreceptors (blind spot)
the lens is being held by?
in the lens fiber is filled with what ?
the term used for lost transperceny of the lens ?
Ciliary zonule
Crystallins
Cataracts
what muscles changes the size of pupil
Pupillary muscles
Change diameter of pupil (central opening of iris)
where do the tears start to collect?
what is the order that tears pass through?
in lacrimal lake at medial angle of eye
Lacrimal puncta (pores)
Lacrimal canaliculi (canals)
Lacrimal sac
Nasolacrimal duct
To nasal cavity
the aqueous humor where does it circulates?
in which sinus does it enter?
in what area does it reenter ?
Fluid that circulates within anterior cavity
Also diffuses through posterior cavity
Enters scleral venous sinus (canal of Schlemm) at corneoscleral junction
Reenters circulation at veins in sclera
the difference between the vitreous body and the vitreous humor
Vitreous body
Gelatinous mass in posterior cavity
Helps stabilize shape of eye
Vitreous humor
Fluid portion of vitreous body
what does the lamina propria contain
Areolar tissue, blood vessels, and nerves
Olfactory glands (secretions form mucus)
the olfactory pathway what fibers leave?
how many bundles ?
what does it penetrate ?
where does it reach?
Afferent fibers leave olfactory epithelium
Collect into 20 or more bundles
Penetrate cribriform plate of ethmoid
Reach olfactory bulbs of cerebrum where first synapse occurs
the olfactory pathway after the olfactory bulb where does it go ?
Axons leaving olfactory bulb
Travel along olfactory tract to olfactory cortex, hypothalamus, and limbic system
Gustatory epithelial cells (taste receptors)
where are they found?
where are they distributed?
which papillae is it associated with?
Found in taste buds
Distributed on superior surface of tongue and portions of pharynx and larynx
Associated with epithelial projections (lingual papillae) on surface of tongue
the visual pathway where does is being and end?
where do the messages cross?
what is the order of the cells?
Begin at photoreceptors
End at visual cortex of cerebral hemispheres
Messages must cross two synapses before moving toward brain
Photoreceptor to bipolar cell
Bipolar cell to ganglion cell
the central processing of visual information
- Axons from ganglion cells converge on optic disc
- Penetrate wall of eye
- Proceed toward diencephalon as optic nerve (II)
- Two optic nerves reach diencephalon after partial crossover at optic chiasm
- Information travels to visual cortex in occipital lobe
