Intermediate Cornea Quiz

Q1. What is the correct anterior-to-posterior order of the five classic corneal layers?

• Epithelium, Bowman layer, stroma, Descemet membrane, endothelium
• Epithelium, Descemet membrane, stroma, Bowman layer, endothelium
• Epithelium, stroma, Bowman layer, endothelium, Descemet membrane
• Endothelium, Descemet membrane, stroma, Bowman layer, epithelium

Q2. What is Bowman layer located between?

• Descemet membrane and endothelium
• Sclera and choroid
• Stroma and Descemet membrane
• Corneal epithelium and stroma

Q3. Descemet membrane is the basement membrane of which corneal cell layer?

• Stromal keratocytes
• Conjunctival goblet cells
• Corneal endothelium
• Corneal epithelium

Q4. Why does the corneal stroma remain transparent despite containing abundant collagen?

• It is filled with blood vessels that absorb scattered light
• It contains no extracellular matrix
• Its collagen fibrils are regularly organized and spaced
• Its collagen is replaced by elastic cartilage

Q5. Which cells are found between collagen lamellae in the corneal stroma?

• Ganglion cells
• Photoreceptors
• Melanocytes only
• Keratocytes

Q6. How does the avascular cornea receive oxygen at its anterior surface under normal open-eye conditions?

• Diffusion from vitreous humor only
• Direct supply from a central corneal artery
• Diffusion from atmospheric oxygen through the tear film
• Transport through the optic nerve

Q7. What is an important source of nutrients for the posterior cornea?

• Vitreous body only
• Lacrimal drainage system
• Aqueous humor
• Central retinal artery directly

Q8. What is the main role of the corneal endothelium in maintaining transparency?

• Maintaining relative stromal dehydration by fluid transport
• Producing most of the tear film
• Producing photoreceptor pigments
• Contracting to alter corneal curvature

Q9. Which nerves typically reach the cornea after traveling with the nasociliary nerve?

• Greater petrosal nerves
• Long ciliary nerves
• Lesser occipital nerves
• Short ciliary nerves exclusively

Q10. Why is the cornea extremely sensitive to touch?

• It contains auditory hair cells
• It has a dense sensory innervation
• It is supplied directly by the optic nerve
• It contains skeletal muscle spindles