Histology Of The Eye Flashcards
What are the 3 tunics of the eye?
1 fibrous tunic
2 vascular tunic
3 inner tunic
What are the components of the fibrous tunic?
Sclera and cornea
What are the components of the vascular tunic?
Choroid, ciliary body, and iris
What is/are the component(s) of the inner tunic?
Retina
What are the sclera layers? (3)
1 episcleral layer
2 Sclera proper
3 lamina cribrosa
T/F: the episcleral layer is innervated
False; highly vascular
Sclera proper is the attachment site for…
Tendons of extrinsic eye muscles
T/F: Anteriorly the sclera is continuous with the cornea
T
T/F: The junction between the two is limbus; it is highly innervated
F; highly vascularized
T/F: Posteriorly the sclera is continuous with the dural covering of the optic nerve
T
What are the cornea layers? (5)
1 corneal epithelium 2 Bowman’s membrane 3 corneal storms 4 descemet’s membrane 5 corneal endothelium
The choroid contains loose or tight CT?
Loose
What is the acellular fused basal laminate of choriocapillaris and pigmented retinal epithelium
Bruch’s (glassy) membrane
Ciliary body is covered by a double or single layer of cells?
Double
What is the layer of cells that produce the aqueous humor
Nonpigmented surface layer
The iris has a double or single layer of epithelium?
Double
The retina has 2 subdivisions that are divided by the?
Ora serrated
What causes glaucoma?
Increased pressure due to compromised drainage of aqueous humor from anterior chamber
What are the chambers of the eye?
Anterior, posterior, and vitreal chamber
Bipolar cells conducting neurons that synapse with?
Rods and cones
Horizontal cells inter neurons that interconnect rods and cones with each other and with?
Bipolar cells
Amacrine cells interneurons that connect __ cells and bipolar neurons
Ganglion cells
Muller cells are __ cells that extend throughout retina
Neurological cells
Ganglion cells are conducting neurons whose axons form the fibers of the __?
Optic nerve
Fovea has the highest __?
Visual acuity
Macula lutea is the yellow region surrounding the?
Fovea
Fovea centralis has the highest density of __ cells
Cone
Optic disc lacks
Photoreceptors
Optic disc aka as __ of retina
Blind spot
Fovea centralis lacks __ cells and __
Rod cells and capillaries
Rod aka
Spherule
Cone aka
Pedicle
Inner segment contains
Mitochondria and other organelles
Cell body contains
Nucleus and short axon
Rods use __ as photopigment
Rhodopsin
Rod are sensitive to __ light intensity and responsible for what type of vision?
Low light and black and white vision
Cones use how man different kinds of iodopsins
3
Cones are sensitive to __ intensity light and responsible for what type of vision?
High intensity and color vision
How many rods synapse it’s single bipolar cell
Up to 100 rods
How man cone cells synapse with a single bipolar cell
1 cone cell
The ganglion cell layer contain what type of cells?
Cell bodies of ganglion cells
Optic nerve layer contain what type of cells?
Axons of ganglion cells
Pigmented epithelial cells synthesize what?
Melanin
What type of protein is rhodopsin?
Transmembrane glycoprotein
What is bleaching?
Disassembly of rhodopsin into opsin and retinal after light stimulation
What are the 3 parts to a lens?
Capsule, anterior epithelium, and lens nucleus
What are the 2 glands associated with the eyelid?
Glands of Zeiss (sebaceous gland)
Glands of MOll (sweat glands)
What fascia is the fibrous core of eyelids? And what gland is found here?
Palpebral fascia and meibomian glands (sebaceous)
What lines the inner surface of eyelids, covers eyeball, and has stratified columnar/squamous epithelium with goblet cells?
Paperbral conjunctiva
