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100+ Free CMSA FC Ophth(SA) Part I — College of Ophthalmologists of South Africa Practice Questions
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Key Facts: CMSA FC Ophth(SA) Part I — College of Ophthalmologists of South Africa Exam
100 Qs
Practice Bank
OpenExamPrep Practice Bank
R15 500
Exam Fee
CMSA Fee Schedule
50% + Submin
Passing Score
CMSA Regulations
CMSA
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Colleges of Medicine of SA
The CMSA FC Ophth(SA) Part I tests core basic sciences relevant to ophthalmology. This practice bank provides 100 high-yield, scientifically rigorous practice questions formatted for candidates preparing for the CMSA Part I written examinations.
Sample CMSA FC Ophth(SA) Part I — College of Ophthalmologists of South Africa Practice Questions
Try these sample questions to test your CMSA FC Ophth(SA) Part I — College of Ophthalmologists of South Africa exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Which of the following bones forms the majority of the floor of the human orbit?
A.Maxillary bone
B.Zygomatic bone
C.Palatine bone
D.Sphenoid bone
Explanation: The maxillary bone forms the largest portion of the orbital floor, situated between the zygomatic bone laterally and the palatine bone posteriorly. The orbital surface of the maxilla is thin and susceptible to blowout fractures into the underlying maxillary sinus.
2Which cranial nerve provides motor innervation to the superior oblique muscle?
A.Cranial nerve IV (Trochlear nerve)
B.Cranial nerve III (Oculomotor nerve)
C.Cranial nerve VI (Abducens nerve)
D.Cranial nerve V1 (Ophthalmic nerve)
Explanation: Cranial nerve IV (the trochlear nerve) exclusively innervates the superior oblique muscle. It is the only cranial nerve that emerges from the dorsal aspect of the brainstem and has the longest intracranial course.
3The arterial blood supply to the retina is primarily derived from which branch of the internal carotid artery?
A.Ophthalmic artery
B.Anterior cerebral artery
C.Middle meningeal artery
D.Maxillary artery
Explanation: The central retinal artery is a direct branch of the ophthalmic artery, which itself originates from the internal carotid artery. The central retinal artery enters the optic nerve approximately 10-15 mm behind the globe to supply the inner two-thirds of the retina.
4During embryonic development, the retinal pigment epithelium (RPE) and neurosensory retina are derived from which tissue layer?
A.Neuroectoderm
B.Surface ectoderm
C.Neural crest cells
D.Mesoderm
Explanation: Both the RPE and neurosensory retina develop from neuroectoderm via invagination of the optic vesicle to form the double-layered optic cup. The outer layer becomes the RPE, and the inner layer differentiates into the neurosensory retina.
5Which histological structure separates the corneal anterior epithelium from the underlying corneal stroma?
A.Bowman's layer
B.Descemet's membrane
C.Dua's layer
D.Corneal endothelium
Explanation: Bowman's layer is an acellular membrane composed of randomly arranged collagen fibrils situated between the corneal epithelial basement membrane and the corneal stroma. It does not regenerate once damaged, leading to scar formation.
6The nasolacrimal duct opens into which structure within the nasal cavity?
A.Inferior nasal meatus
B.Middle nasal meatus
C.Superior nasal meatus
D.Sphenoethmoidal recess
Explanation: The nasolacrimal duct travels inferiorly through the nasolacrimal canal and empties into the inferior nasal meatus beneath the inferior nasal concha. Valve of Hasner guards this ostium.
7Through which orbital aperture does the ophthalmic nerve (CN V1) enter the orbit?
A.Superior orbital fissure
B.Inferior orbital fissure
C.Optic canal
D.Ethmoidal foramina
Explanation: The branches of the ophthalmic nerve (frontal, lacrimal, and nasociliary nerves) pass through the superior orbital fissure to enter the orbit. The lacrimal and frontal nerves pass above the annulus of Zinn, while the nasociliary nerve passes through it.
8Which of the following structures is an embryological derivative of neural crest cells?
A.Corneal stroma
B.Crystalline lens
C.Vitreous body collagen
D.Retinal ganglion cells
Explanation: Neural crest cells migrate into the optic cup region to form periocular mesenchyme, which gives rise to corneal keratocytes (stroma), corneal endothelium, sclera, trabecular meshwork, and iris stroma.
9Which extraocular muscle originates from the anterior medial floor of the orbit rather than the annulus of Zinn?
A.Inferior oblique
B.Superior oblique
C.Inferior rectus
D.Levator palpebrae superioris
Explanation: The inferior oblique muscle is the only extraocular muscle that does not take origin from the apex of the orbit (annulus of Zinn). It originates from a small depression on the orbital surface of the maxilla, just lateral to the nasolacrimal groove.
10Where are parasympathetic preganglionic cell bodies that mediate pupillary constriction located in the central nervous system?
A.Edinger-Westphal nucleus
B.Superior salivatory nucleus
C.Ciliary ganglion
D.Principal sensory nucleus of V
Explanation: The Edinger-Westphal nucleus located in the rostral midbrain houses the preganglionic parasympathetic neurons for pupillary constriction (miosis) and accommodation. Axons travel via CN III to synapse in the ciliary ganglion.
About the CMSA FC Ophth(SA) Part I — College of Ophthalmologists of South Africa Practice Questions
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