Histology: Special Senses Flashcards
The outer sceleral layer of the eye, _______, is made up of _____, and is continuous with the _____
tenon’s capsule
dense irrgula connective tissue
corneal layer
labell A-E
A: epithelium
B: bowmans membrane
C/D: corneal stroma
E: Descemet’s membrane
What is the corneal matrix made of?
fibroblasts that are imbedded in a collagen glycoportein matrix
What is the function of the endothelial layer of the cornea?
it has ion transport activity and so it keeps the cornea dehydrated and prevents water logging. this layer has a low capacity to regernrate
why doesnt the eye dry out?
there is a lipid layer on the top to prevent evaporation of water
What layer of the eye is this?
Uveal (chorioid) because of all the vasculature. it is made up of loose connective tissue, fibroblasts, macrophages, malanocytes,
what are the three layers of the eye?
scleral/corneal layer, vascular layer (choroid), and the retina
the ciliary bodies are lined by two______. one layer is an extension of the ______, and the other is an extension of the _______
cuboidal/columnar epithelial cell layers
posterior retinal layer
deeper pigmented epithelial layer
the aqueous humor is produced by the _____ and flows from _____ to ____, and is drained at the ____ by the
non pigmented layer of the ciliary body
posterior
anterior
limbus
trabecular meshwork
a blockage of aqueous humor drainage results in _____
gluacoma, increase in intraocular pressure
what are the red and purple arrows pointing to?
Red: trabecular meshwork
Purple: canal of schlemm
what are the two muscles in the iris?
dilator pupillae muscle, and spinchter pupillae muscle
label A-F
A: dilatory pupil muscle
B: sphicnter pupil muscle
C: sphincter muscle contracted
D: relaxed radial muscle
E: sphinter muscle relaxed
F: radial muscles contracted
the sphincter/contsrictior muscle near the middle of the pupil is ______. the dilator muscle is farther out and it is _____
thick
thinner (myoepethilium)
formation of the lens fibers involves the descruction of ____ via _____
internal cell organelles
arrested apoptosis
what are the different cell types in the retina?
rods, cones, bipolar cells, ganglion cells, muler glia, astrocytes, microglia, retinal pigmented epithelium
label the retinal layers
from top to bottom: Inner limiting membrane, optic nerve fibers, ganglion cell layer, inner plexiform layer, inner nuclear layer, outer plexiform layer, outer nucelar layer, outer limiting membrane, photoreceptor layer, retinal pigmented epithelium
what are some functions of the retinal pigmented epithelium?
secretion, phagocytosis, transport, light abroption
what causes retinal detachment?
the junction between the pigmented epithelium and the external segmemtns of the photoreceptor cells is weak.
what are the two sources of blood to the retina?
the choroid, and the retinal veinand artery system
at the optic papillae, the ______ penetrates the retinal layer and leaves the eye, and the _____ enters and exits
optic nerve
retinal blood supply
difference between rods and cones
rods are good for low light and light sensitivitty
cones are good for color and spatial resolution
the primate fovea contains mostly _____ cells
cone
the apocrine sweat glands in the eye are called____ and they secrete ____
glands of moll
immunoglobulins and antibacterials
what do the lacrimal glands in the eye do?
they produce water for tears, serous fluid
what do sebaceous glands in the eye do?
they produce oil for tears
