Intermediate Iris Quiz
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This quiz contains 10 questions. Click below to begin.
Q1. Which nerve carries preganglionic parasympathetic fibers involved in pupillary constriction?
- Optic nerve, CN II
- Oculomotor nerve, CN III
- Abducens nerve, CN VI
- Trochlear nerve, CN IV
Q2. Where do parasympathetic fibers for the sphincter pupillae synapse?
- Superior cervical ganglion
- Ciliary ganglion
- Trigeminal ganglion
- Pterygopalatine ganglion
Q3. Which nerves carry postganglionic parasympathetic fibers from the ciliary ganglion to the iris?
- Supraorbital nerves
- Long ciliary nerves only
- Short ciliary nerves
- Greater petrosal nerves
Q4. Where are the cell bodies of postganglionic sympathetic neurons supplying the dilator pupillae?
- Superior cervical ganglion
- Otic ganglion
- Ciliary ganglion
- Geniculate ganglion
Q5. Which nerves provide an important route for sympathetic fibers to the dilator pupillae without synapsing in the ciliary ganglion?
- Optic nerve fibers
- Greater occipital nerves
- Chorda tympani
- Long ciliary nerves
Q6. Which feature divides the anterior iris surface into pupillary and ciliary zones?
- Macula lutea
- Collarette
- Ora serrata
- Limbus
Q7. What largely determines visible iris color?
- Amount and distribution of stromal and anterior iris melanin
- Number of retinal rods
- Color of the aqueous humor
- Thickness of the corneal endothelium
Q8. Which arterial circles contribute to the blood supply of the iris?
- Central retinal circle and ciliary venous circle
- Major and minor arterial circles of the iris
- Lacrimal and supraorbital circles only
- Circle of Willis and marginal artery
Q9. Which arteries are major contributors to the major arterial circle of the iris?
- Supraorbital and superficial temporal arteries
- Short posterior ciliary and middle meningeal arteries only
- Central retinal and facial arteries
- Long posterior ciliary and anterior ciliary arteries
Q10. Which cranial nerve forms the afferent limb of the pupillary light reflex?
- Facial nerve, CN VII
- Trigeminal nerve, CN V
- Oculomotor nerve, CN III
- Optic nerve, CN II