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Anatomy of the Cornea: Structure and Function

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Anatomy of the Cornea: Structure and Function

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Questions and Answers

What is the thickness of the sclera posteriorly?

Variable
0.4mm
2mm
1mm (correct)

What type of fibers are present in the sclera?

Keratocytes
Tangential collagen fibrils
Collagen, proteoglycans, and elastic fibers (correct)
Circumferential collagen fibrils

What is the origin of the corneal nerves?

Cranial nerve
Optic nerve
Trigeminal nerve (correct)
Ophthalmic nerve

What is the characteristic of the terminal axons in the cornea?

Very sensitive to pain and temperature (D) Signup and view all the answers

What is the relationship between the corneal touch threshold and sensitivity?

Sensitivity is inversely proportional to CTT (C) Signup and view all the answers

What percentage of the total power of the eye is contributed by the cornea?

About 65% (B) Signup and view all the answers

What is the main function of the epithelium in the cornea?

To provide a smooth optical surface (D) Signup and view all the answers

What type of epithelium is found in the most anterior layer of the cornea?

Squamous stratified epithelium (C) Signup and view all the answers

What is the purpose of the gap junctions found in basal cells of the epithelium?

To enable communication between cells (B) Signup and view all the answers

What is the main component of the corneal stroma?

Collagen fibrils (D) Signup and view all the answers

What is the function of the Descemet's membrane?

To separate the stroma from the endothelium (B) Signup and view all the answers

What is the main function of proteoglycans in the corneal stroma?

To act as collagen spacers and attract water (C) Signup and view all the answers

What is the approximate thickness of the human corneal lamellae?

1.5-2.5 μm (B) Signup and view all the answers

What is the role of keratocytes in the corneal stroma?

To produce collagen fibers and maintain fibril order (A) Signup and view all the answers

What is the purpose of the Descemet's membrane?

To provide a base for the endothelium and give mechanical strength (B) Signup and view all the answers

How do the anterior lamellae differ from the posterior lamellae in the human corneal stroma?

The anterior lamellae interweave, while the posterior lamellae do not (B) Signup and view all the answers

What is the approximate percentage of water in the bovine corneal stroma?

78% (D) Signup and view all the answers