CPOA Ocular Anatomy 4 — Questions and Answers
Question 1: What is the name of the blind spot in the visual field corresponding to the optic disc?
- Scotoma centralis
- Physiological blind spot (Correct answer)
- Arcuate defect
- Bjerrum scotoma
Correct answer: Physiological blind spot
The physiological blind spot corresponds to the optic disc, which has no photoreceptors where the optic nerve exits the eye.
Question 2: The vitreous humor occupies which segment of the eye?
- Anterior chamber
- Posterior chamber
- Vitreous chamber (posterior segment) (Correct answer)
- Sub-Tenon's space
Correct answer: Vitreous chamber (posterior segment)
The vitreous humor fills the vitreous chamber, the large posterior segment of the eye between the lens and the retina.
Question 3: Which structure is responsible for draining aqueous humor from the eye?
- Ciliary body
- Trabecular meshwork and Schlemm's canal (Correct answer)
- Lens capsule
- Bruch's membrane
Correct answer: Trabecular meshwork and Schlemm's canal
Aqueous humor drains primarily through the trabecular meshwork into Schlemm's canal and then into episcleral veins.
Question 4: The ora serrata marks the boundary between which two structures?
- Cornea and sclera
- Choroid and sclera
- Retina and pars plana (Correct answer)
- Iris and ciliary body
Correct answer: Retina and pars plana
The ora serrata is the serrated anterior border of the sensory retina where it meets the pars plana of the ciliary body.
Question 5: Which coat of the eye provides structural rigidity and maintains the eye's shape?
- Uvea
- Retina
- Sclera (Correct answer)
- Conjunctiva
Correct answer: Sclera
The sclera is the tough, fibrous outer coat of the eye that provides structural support and maintains the globe's shape.
Question 6: How many layers does the corneal epithelium consist of?
- 2–3 layers
- 5–7 layers (Correct answer)
- 10–12 layers
- 15–20 layers
Correct answer: 5–7 layers
The corneal epithelium is composed of 5–7 layers of non-keratinized squamous epithelial cells.
Question 7: The medial rectus muscle is innervated by which cranial nerve?
- CN II
- CN III (Correct answer)
- CN IV
- CN VI
Correct answer: CN III
The oculomotor nerve (CN III) innervates the medial rectus, superior rectus, inferior rectus, inferior oblique, and levator palpebrae superioris.
CPOA Ocular Anatomy 4
What is the name of the blind spot in the visual field corresponding to the optic disc?