T8.1: Special Senses - Eye Flashcards
The middle vascular layer of the tunica fibrosa contains what type of collagen fibers? (MFG) A. Type I B. Type II C. Type III D. Type IV
A. Type I The middle layer of the tunica fibrosa is the substantia propria which is vascular and made of collagen type I fibers. The tunica fibrosa is also called the corneoscleral coat.
A seamstress is threading a needle when she sneezes violently, trusting her head forward and impaling the needle in her right eye ball. Which layer of the cornea will not regenerate? (MG) A. Anterior corneal epithelium B. Bowman’s membrane C. Corneal stroma D. Descemet’s membrane E. Posterior corneal endothelium
B. Bowman’s membrane Does not regenerate Provides stability and strength Homogenous collagen fibers All choices are layers and listed in order A-E, Anterior-Posterior
Tenon’s space exists between the episcleral layer and a layer that is (MG) A. Pigmented B. Loose connective tissue C. Well-innervated D. Vascular
D. Vascular Tenon’s space sits between the episcleral layer and the substantia propria which is the vascular layer of the tunica fibrosa
The Tunica Vasculosa of the eye contains the …. A. Sclera B. Retina C.Cornea D. Uvea RFA
ANS.D. Uvea(Iris)- is part or the Tunica Vasculosa (media) it also contain the choroid+ Ciliary body A. Sclera- part of the Tunica Externa(fibrosa) B. Retina - part of the Tunica interna(nerova) C. Cornea is also a part of the tunica externa
A researcher is looking at a histology slide and sees 60 lamellae each made of collagen fibrils. What else is true of this layer? A. Made of chondroitin sulphates B. Maintains optimum hydration of the corneal stroma C. Has abundant sodium pumps D. Regenerates in 7 days RFA
Ans. A Made of chondroitin sulfates- the layer being described is the Corneal stroma. The regular arrangement of collagen fibers allows for transparency and is made of chondroitin and keratan sulfates. B. Describes the Posterior corneal endothelium C. is also part of the posterior corneal endothelium D. Is characteristic pf the Anterior corneal epithelium
A pirate is in a crowsnest patrolling and spots a crew of skallywags nearly 70 feet away. What is the correct combination of actions the pirates eyes are doing? A. Ciliary Muscles contract and Zonular fibers relax B Ciliary muscles relax and Zonular fibers tighten C. Ciliary muscles contract and zonular fibers tighten D. Ciliary muscles relax and Zonular fibers relax. RFA
ANS. B. The object is far away so the pirate’s eyes are going to have to accommodate for the distance by Ciliary muscles relaxing and Zonular fibers tightening which will cause the Lens to flatten A. Ciliary muscle contracting and zonular fibers relaxing causing the lens to become more spherical, this is for close objects (<20 ft)
The ____________ supplies retinal layers I to V with blood, while the __________ supplies layers VI to X with blood. FA
Chorio-capillaries supply layers I to V via passive diffusion Branches of the Central Retinal artery supply layers VI to X
Which of the following structures is considered to be a portion of the Blood-Retinal Barrier? A. Chorio-capillary layer B. Choroid Proper C. Bruch’s Membrane D. Outer limiting membrane E. Layer of Rods and Cones FA
C. Bruch’s membrane, alone with the Retinal pigmented Epithelium make up the blood-retinal barrier Chroid proper is further out and composed of large blood vessels and melanocytes The outer limiting membrane is a portion of the retina that contains the ends of the axons of both the bipolar cell and the photoreceptors
The ganglionic cell axons converge at the optic disk and exit the the eye via the __________. FA
The exit to the eye is called the Area Cribrosa
Regular arrangement of keratin and chondroitin sulphates allows for transparency in which layer of the cornea? A. Anterior corneal epithelium B. Bowman’s membrane C. Corneal Stroma D. Descemet’s Membrane E. Posterior corneal endothelium F. Dog with Goggles AA
C. Corneal stroma is the answer. It is the layer of the cornea with 60 lamellae, each made of collagen fibrils, which are orientated at right angles to each other.
Homogenous collagen filaments, meshwork of collagen, and fenestrations are all characteristics of which layer of the cornea? A. Anterior corneal epithelium B. Bowman’s membrane C. Corneal Stroma D. Descemet’s Membrane E. Posterior corneal endothelium F. Dog with Goggles AA
D. Descemet’s Membrane
Simple squamous cells, abundant sodium pumps, and the function of maintaining optimum hydration of the corneal stroma are all characteristics of which layer of the cornea? A. Anterior corneal epithelium B. Bowman’s membrane C. Corneal Stroma D. Descemet’s Membrane E. Posterior corneal endothelium F. Dog with Goggles AA
E. Posterior corneal endothelium
what is this?
glaucoma
Left- rod
right- cone
