Opt 114 choroid:: innervation/vasculature
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38 Terms
what kind of innervation is in the choroid (motor/sensory)
sensory, autonomic motor
what nerve is responsible for sensory innervation in the choroid
CN5 (trigeminal)
what branch of the trigeminal nerve innervates the choroid
ophthalmic nerve
what branch of the ophthalmic nerve innervates the choroid
nasociliary nerve
what branch of the nasociliary nerve innervates the choroid
long ciliary nerve
what kind of sensation is sensed in the choroid
proprioception (awareness) - what's going on around the choroid
are there pain receptors in the choroid
no
what gives off signals to the choroid (signals sensory nerves)
RPE when it needs more nutrients
T/F: there is no autonomic innervation to the choroid
F
what kind of autonomic innervation is tehre to the choroid
sympathetic and parasympathetic
what does the sympathetic innervation of the choroid do
vasoconstricts blood vessels
what does hte parasmpathetic innervation of teh choroid do
vasodilates blood vessels
what autonomic trend is true for most blood vessles
sympathetic usually causes vasoconstriction, parasympathetic usually causes vasodilation
what pathway do the autonomic nerves follow
they don't have their own pathways, they have to follow other nerves
what is structurally different between choriocapillaris capillaries and regular capillaries
a wider lumen, highly fenestrated on retinal side, and a discontinuous basement membrane
how much wider are choriocapillaris capillaries than regular
3-4x wider
why is the choriocapillaris capillaries so fenestrated
allows a significant amoutn of nutrients/oxygen for teh retina
where is the fastest blood flow through capillaries in the body
choriocapillaris
why is the speed of blood flow so fast in the choriocapillaris
feeds the photoreceptors which are always working and therefore need a constant supply of nutreints/oxygen
speed of blood in the choriocapillaris vs regular capillaries (numbers)
2000mL/min vs 60mL/min
distribution of ocular blood (percentages)
80% to choriocapillaris, 15% to irisciliary body, 5% to retina
what is the progression of large to small to large blood vessels
arteries > arterioles > capillaries > venules > veins
where do arteries travel in teh choroid
suprachoroid then radially through stroma
where are arteries found in the choroid
stroma
where are capillaries found in the choroid
choriocapillaris
where are venules found in the choroid
stroma
where are veins found in teh choroid
suprachoroid
what veins are found in the suprachoroid
vortex veins
what kind of blood do the veins in teh choroid carry
deoxygenated
what 3 arteries feed the choroid
anterior ciliary, long posterior ciliary, and short posterior ciliary arteries
what arteries do the anterior ciliary arteries branch off of
muscular arteries
anterior ciliary, long posterior ciliary, and short posterior ciliary arteries are found in what layers of the choroid
stroma and choriocapillaris
what divisions are there of the choroid in terms of the vasculature
anteiror and posterior
which arteries are found in the anterior choroid
anterior ciliary and long posterior ciliary arteries
which arteries are found in teh posterior choroid
short posterior ciliary arteries
the arteries of the anteiror choroid anastamose with what
the posteiror choroid
the long and short posterior ciliary arteries enter the orbit via what
posterior apertures
the anterior choroid is located where
near the ora serrata