Past MCQs on Ocular Anatomy.docx

Past MCQs on Ocular Anatomy 1. The medial wall of the orbit includes: a. body of sphenoid b. vertical plate of palatine bone c. trochlear fossa d. lacrimal fossa e. optic canal

2. The foramina that communicate directly with the orbit include: a. foramen rotundum b. zygomaticotemporal foramen c. posterior ethmoidal foramen d. infraorbital foramen e. supraorbital foramen 3. The structures that pass through the common tendinous ring include: a. trochlear nerve b. nasociliary nerve c. sympathetic fibres from the plexus around the internal carotid artery d. parasympathetic fibres from the pterygopalatine ganglion e. central artery of the retina

4. The inferior orbital fissure transmits the: a. maxillary nerve b. posterior superior alveolar nerve c. sphenopalatine artery d. inferior ophthalmic vein e. zygomatic nerve 5. Concerning the orbit: a. the superior orbital fissure connects with the anterior cranial fossa b. the optic canal connects with pituitary fossa c. the inferior orbital fissure connects with the infratemporal fossa d. the lateral wall is the thickest wall e. the supra-orbital notch is at the middle of the upper

margin

6. The orbit: a. the apex of the orbital cavity is at the optic canal b. the anterior and posterior lacirmal crests are features of the lacrimal bone c. the margin is formed by the frontal, zygomatic, lacrimal and maxillary bones d. the inferior orbital fissure is closed by orbital fascia and striated muscle e. the medial palpebral ligament is attached to the lacirmal bone 7. The grey line of the eyelid: a. owes its colour to increased vascularity b. represents the mucocutaneous junction c. is behind the eyelashes (cilia) d. is at the level of the ciliary bundle of the orbicularis oculi muscle e. when entered surgically gives access to a plane between orbicularis oculi and the tarsal plate

8. The upper eyelid: a. has eyelashes (cilia) along its entire margin b. covers the whole cornea in blinking c. has about 150 eyelashes (cilia) d. has the modified sweat glands of Zeis opening behind the hair follicles e. has fibres of insertion fo the frontalis muscle

9. The tarsal glands: a. a re modified sebaceous glands b. are embedded in the tarsal plates c. are longer and more numerous in the upper eyelid d. have ducts which open at the mucocutaneous junction e. have stratified squamous epithelium lining the mouths of their ducts.

10. In the eyelids: a. the lacrimal nerve supplies the skin of the upper eyelid b. the infratrochlear nerve supplies the skin of the upper eyelid c. the lacirmal nerve supplies the conjunctiva of the lower eyelid d. the infratrochlear nerve supplies the conjunctiva of the lower eyelid e. the infratrochlear nerve supplies the skin of the lower eyelid

11. The conjunctiva: a. is closely adherent to the underlying sclera b. is highly vascular in its bulbar portion c. has mucus secreting goblet cells which are more numerous on the eyelid d. is supplied by the infra-orbital nerve at its lower bulbar part e. is modified skin lacking sebaceous and sweat glands at the lacrimal caruncle

12. The eyelids: a. have hairs only at the lid margins b. have eyelashes which are thinner than hair on other parts of the body c. have tarsal plates which re twice as tall in the upper lid d. have tarsal plates attached to the orbit walls along their convex margins e. receive blood supply from medial and lateral palpebral branches of the ophthalmic artery

13. Regarding the lacrimal gland: a. the palpebral part of the lacrimal gland is half the size of the orbital part b. ducts from the orbital part drain into the palpebral part through the levator muscle

c. the palpebral part drains into the superior conjunctival fornix through about 12 ducts d. the lymphatic drainage of the lacrimal gland is to the submandibular nodes e. excision of the palpebral part abolishes tear secretion on the operated side.

14. In the lacrimal drainage pathway: a. the upper lacirmal punctum is lateral to the lower punctum b. the lacrimal canaliculi may open into the lacrimal sac through a common canaliculus c. the lacrimal canaliculi are lined by stratified squamous epithelium d. the nasolacrimal duct runs downwards, laterally and to the anterior part of the inferior meatus. e. the nasolacrimal duct is narrowest at its lower end where a mucosal flap prevent s reflux

15. Tendinous fibres from the aponeurosis of levator palpebrae superioris: a. pierce the orbital septum b. pierce the orbicularis oculi muscle c. are attached to the posterior aspect of the superior tarsal plate d. are attached to the medial palpebral ligament e. are attached to the marginal tubercle of the zygomatic bone

16. The parasympathetic secretomotor pathway to the lacrimal gland includes: a. nerve cells in the pons b. the nervus intermedius (sensory root of facial nerve) c. lesser petrosal nerve d. nerve of the pterygoid canal e. zygomatic nerve

17. The superior oblique muscle: a. is attached to the frontal bone b. lies above the medial rectus muscle c. has a tendon that passes through a fibrocartilaginous trochlea d. has a tendon that passes below the superior rectus muscle e. is supplied by trochlear nerve on its inferior aspect

18. Concerning extraocular muscles: a. the medial rectus is inserted to the sclera most anteriorly b. the inferior oblique is attached to the orbital wall most anteriorly c. the nerve to medial rectus passes below the optic nerve d. the inferior oblique passes below the inferior rectus e. the superior oblique is tested by asking the patient to look at the tip of his or her nose

19. The fascial sheath of the eyeball: a. blends with the sclera at the corneoscleral junction b. blends with the dura mater around the optic nerve c. is reflected around the tendon of the superior oblique as far as the trochlear d. has an expansion from the sheath of the medial rectus attached to the lacrimal bone e. is connected to the sclera by dense collagen bands which traverse the episcleral space

20. The eyeball: a. is close to the floor of the orbital cavity than to the roof b. is closer to the lateral wall of the orbital cavity than to the medial wall c. has a vertical diameter less than the transverse and anteroposterior diameters d. has an anterior segment which is more curved and

forms a quarter fo the whole circumference e. is least protected laterally

21. The cornea: a. has five layers b. has an epithelium which consists of five layers of cells c. has columnar cells at the deepest layer of the epithelium d. is thinnest at the centre e. receives blood supply from the anterior ciliary arteries at its periphery

22. The sclera: a. is thickest posteriorly b. is thinnest just behind the insertions of the recti muscles c. transmits the central retinal artery and vein through the largest opening in the cribosa lamina d. is grooved on its inner surface by ciliary vessels and nerve e. has 75% of its dry weight accounted for by collagen 23. At the limbus: a. there is a shallow groove on the outer surface of the sclera b. the sinus venosus sclerae (canal of Schlemm) is in the sclera c. the sinus venosus sclerae may be double in part of its course d. there is direct connection between the venous sinus and the trabecular meshwork e. there is no blood in the canal of Schlemm because the communicating channels with anterior ciliary veins have valves

24. The corneoscleral junction: a. Descemet's membrane ends at Schwalbe's line which marks the anatomical limbus b. Bowman's membrane becomes continuous with the facial sheath of the eyeball

c. the limbus is 1.5 to 2 mm wide d. the surgical limbus where the blue area commences is posterior to the anatomical limbus e. the scleral spur is triangular with its apex directed posteriorly

25. The iris: a. has a diameter of about 12 mm b. has a double layer of cells covering both surfaces c. has radial contraction folds on the posterior surface d. is thickest at the ciliary margin e. is pigmented maximally on the anterior surface More MCQs