histology special senses (test 3) Flashcards
What is connected to each of the semicircular canals?
ampullae
What special sensory organ is located in the ampullae of the semicircular canals? What are the components?
Crista
see picture for components
What are the utricle and saccule responsible for?
utricle - horizontal movement
saccule - verticle movement
name the blanked out parts
there are two special sensory organs in the vestibular system, the crista and the macula. Where are they found?
cristae are found in the ampulae
maculae are found in the utricle and the saccule
What are we looking at (Hint: it is an organ in the vestibular system)
macula (in either the utricle or succule)
What are we looking at (Hint: it is an organ in the vestibular system)
Crista (inside the ampulla)
Note: the histology slide does not show the cupula
What are the 3 chambers of the cochlea? Which two are continuous?
Scala vestibuli
scala media
scala tympani
scala vestibuli and scala tympani are continuous
what type of fluid is found in the scala vestibuli, scala media, and scala tympani
scala vestibuli (perilymph)
scala media (endolymph)
scala tympani (perilymph)
What secretes endolymph into the scala median?
the spiral limbus and the secreting epithelium
What are the 3 general layers of the eye?
fibrous layer
vascular intermediate layer
epithelial innter layer
what makes up the fibrous layer of the eye?
sclera and the cornea
What makes up the vascular layer of the eye?
choroid, ciliary body, and iris
What makes up the epithelial layer of the eye?
neural retina, pigmented epithelium, ciliary epithelium, and iris epithelium
From what embryologic structure does the retina arise?
diencephalon
What are the 5 layers of the cornea?
1) epithelium
2) Bowman’s membrane
3) stroma
4) Descemet’s membrane
5) Endothelium
What are we looking at? Can you name the layers?
What are the two layers of the iris?
fibrous/vascular stroma layer
epithelial layer
What layer in the iris (stromal or epithelial layer) are vessels, melanocyes, and smooth muscle found?
stromal layer
what layer in the iris (stromal or epithelial layer) are the pigmented cuboidal cells?
epithelial layer
We’re looking at the iris. Where are the stromal and epithelial layers?
Name the letters
arrow = zonular fiber
CP = ciliary process (ciliary epithelium that secretes aqueous humor)
CM = ciliary muscles
SVS = canal of schlem
PC = posterior chamber
VC = vitreous chamber
There are two layers of the ciliary epithelium. name them on this slide
PE = pigmented cuboidal epithelium
NE = non-pigmented cuboidal epithelium
describe the development of the lens
cells in the anterior part of the lens become cuboidal epithelium
Cells in the posterior lens differentiate to become lens fiber cells. Lens fiber cells are packed with crystallins
What is this?
What are we looking at? Can you name some of the parts?
retina
NOTE: the picture is flipped in the answer. Don’t get confused
(not sure how much of this we need to know)
what are muller glia cells?
phagocytic cells that are “wrapped” around axons of rods and cones
There are two sources of blood supply to the retina. Name them
central retinal artery (comes into the eye via the optic nerve)
choroid plexus (highly vascularized)
does the fovea receive blood from the central retinal artery, the choroid plexus, or both?
The choroid plexus
True of false
The vitreous body is composed of hyaluronic acid and collagen with few hyalocytes
true
What are we looking at?
tongue
What is the arrow pointing to?
taste bud
What are the 5 catagories of taste?
bitter
umami
sweet
sour
salty
(BUSSS)
What are we looking at?
olfactory epithelium
Beneath olfactory epithelium are bowman’s glands. What is their purpose?
Bowman’s glands release odorant binding proteins (OBP). OBPs bind the odor and then odor/OBP complex bind to the smell receptor
