Corneal Anatomy Quiz

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Questions and Answers

What is the function of the dilator pupillae muscle?

To separate the anterior and posterior chambers of the eye
To constrict the pupil in bright light
To dilate the pupil in dim light (correct)
To regulate the diameter of the lens

Which layer covers the ciliary body and processes?

Triple layer of cuboidal epithelium
No epithelial covering
Single layer of squamous epithelium
Double layer of columnar epithelium (correct)

What type of muscle is the ciliary muscle?

Cardiac muscle
Striated muscle
Smooth muscle (correct)
Skeletal muscle

Which structure arises from the anterior border of the ciliary body?

Dilator pupillae (A) Signup and view all the answers

What happens to the lens when the ciliary muscle contracts?

Lens becomes more round (B) Signup and view all the answers

How do autonomic reflexes regulate pupil diameter?

Dim light stimulates circular muscles to constrict the pupil (D) Signup and view all the answers

What is the common site of retinal detachment?

Optic disc (D) Signup and view all the answers

Which area of the retina is specialized for discrimination of details and color vision?

Fovea centralis (B) Signup and view all the answers

What is the clinical correlate of optic neuritis?

Multiple sclerosis (D) Signup and view all the answers

Which structure of the eye contains only cones and is specialized for high visual acuity?

Fovea centralis (A) Signup and view all the answers

What holds the lens in place within the eye?

Radially oriented zonular fibers (D) Signup and view all the answers

Which part of the eye is described as a biconvex structure?

Lens capsule (C) Signup and view all the answers

Which layer of the cornea provides structural strength and acts as a barrier against infection?

Bowman's membrane (C) Signup and view all the answers

What is responsible for the uniform spacing and orthogonal arrangement of collagen fibrils and lamellae in the corneal stroma, contributing to its transparency?

The orientation of collagen fibrils at right angles to each other in each lamella (A) Signup and view all the answers

Which structure is primarily composed of fibrillin and has the function of producing and anchoring zonular fibers?

Suspensory ligament of the lens (D) Signup and view all the answers

What is the main function of the outer pigmented layer in the eye?

Anchoring zonular fibers (A) Signup and view all the answers

Which statement about Descemet's membrane is correct?

It is a thick basal lamina of the corneal endothelial cells with an interwoven meshwork of collagen fibers and pores. (B) Signup and view all the answers

What is the primary function of the corneal endothelium?

To regulate the water content and transparency of the corneal stroma (A) Signup and view all the answers

In Marfan syndrome, what clinical manifestation may be observed related to the eye?

Dislocation of the lens (B) Signup and view all the answers

Which structure is responsible for attaching the retinal pigment epithelium (RPE) to the choriocapillary layer?

Bruch’s membrane (C) Signup and view all the answers

Which type of corneal transplant involves replacing only the endothelial layer of the cornea?

Endothelial keratoplasty (B) Signup and view all the answers

What is the function of the zonule fibers in the eye when a distant object (> 20 feet) is being viewed?

Lens is relaxed and flattened (A) Signup and view all the answers

What is the advantage of corneal transplantation over other organ transplants?

The cornea is avascular, resulting in minimal immunological response and graft rejection. (D) Signup and view all the answers

Where is the posterior chamber located in relation to the eye's anatomy?

Between posterior surface of iris & anterior surface of lens (D) Signup and view all the answers

What is the primary function of crystallins in the lens fibers?

To maintain transparency of the lens (C) Signup and view all the answers

Which of the following is NOT a clinical correlation associated with the conjunctiva?

Presbyopia (C) Signup and view all the answers

What is the primary function of the Meibomian glands in the eyelids?

To lubricate and delay drying of tears (A) Signup and view all the answers

Which structure is responsible for the cloudy appearance in cataracts?

Cross-linking of proteins (A) Signup and view all the answers

What is the primary function of goblet cells in the conjunctiva?

To produce mucus for lubrication (B) Signup and view all the answers

Which of the following conditions is associated with the glands of Moll?

Stye (hordeolum) (A) Signup and view all the answers

Flashcards

Dilator pupillae muscle function

Dilates the pupil in dim light.

Layer covering ciliary body

A double layer of columnar epithelium.