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The optic chiasm: * a) Forms the floor of the recess of the third ventricle * b) is inferior to the medial root of the olfactory tract * c) Has the internal carotid artery as its immediate lateral relation * d) Has the mamillary bodies lying immediately posterior to it * e) Is in close relation to the oculomotor nerve inferiorly
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The cornea: * a) is thicker centrally than peripherally * b) Contains 10,000 endothelium cells per square mm at birth * c) Has an acellular collagenous stroma * d) Contain Descemet's membrane is produced by the endothelium * e) Has a refractive index of 1.38
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The cells of the retinal pigment epithelium: * a) Are of mesenchymal origin * b) Are shorter at the fovea than else where in the retina * c) Have intracellular melanosomes * d) Regenerate visual pigment * e) Form the inner outer blood-retina barrier
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The globe: * a) Is closer to the orbital floor than the roof * b) Is closer to the lateral wall of the orbital cavity than to medial wall * c) Has a vertical diameter less than the anteroposterior diameter * d) Has an anterior segment which form 1/4 of the circumference * e) is least protected laterally
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The following are true about lacrimal gland: * a) The palpebral part drains into the superior conjunctival fornix through 12 ducts * b) The palpebral part of the gland is 1/3 the size of the orbital part * c) Excision of palpebral but no the orbital part abolish the tear secretion by the gland * d) It receives secretomotor nerve from the third cranial nerve * e) The lymphatic drainage is to parotid gland
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The following are true about cerebrospinal fluid: * a) It is found in the space between the pia mater and the arachnoid * b) The normal amount in human being is about 500 ml * c) With the body lying in lateral horizontal position, the normal intracranial pressure is about 100 ml of water * d) Only, the lateral ventricle contains choroidal plexus, which secrete cerebrospinal fluid * e) Cerebrospinal fluid contains the same concentration of glucose as the blood
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The inferior rectus muscle: * a) Is inserted 6.5 cm behind limbus * b) Is innervated from its inferior surface * c) Is attached to the lower lid * d) Is the main depressor of the globe when the eye is adducted? * e) lies inferior to the inferior oblique muscle
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The ciliary ganglion: * a) Is found between the optic nerve and the medial rectus * b) Contains sympathetic nerve that supplies the sphincter pupillae * c) Is a parasympathetic relay ganglion for fibers from the Edinger-Westphal Nucleus? * d) Contains sensory nerve * e) Has a motor nerve that goes to the inferior oblique
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The nasociliary nerve supplies: * a) The sphenoidal sinus * b) ethmoidal sinus * c) Cornea * d) lacrimal sac * e) Dilator pupillae
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In the eyelids: * a) The tarsal plate is a continuation of the orbital septum * b) The meibomian glands secrete much in rich secretion * c) The orifices of the meibomian glands are anterior to the root of eyelashes * d) The lower lid is supplied by the maxillary division of the trigeminal nerve exclusively * e) There are more meibomian glands in the upper than lower lids
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True statement about the facial nerve includes: a) Its nucleus is in the floor of the fourth ventricle * b) Its fibres reach the surface of the brain in the cerebellopontine angle * c) Transmits taste fibres for the anterior half of the tongue * d) Gives the deep petrosal nerve as branch to the sphenopalatine ganglion * e) Has a sensory component that supplies the outer ear
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With regard to the lacrimal drainage system: * a) The upper lacrimal punctum is lateral to the lower punctum * b) The lacrimal canaliculi are lined by stratified squamous epithelium * c) nasolacrimal duct is narrowest at the lowest end * d) nasolacrimal duct runs downwards, lateral and forwards to the anterior part of inferior meatus * e) Congenital blockage is due mainly to delay development of common canaliculus
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The vitreous: * a) Is firmly attached to the pars plana * b) Has a high concentration of hyaluronic acid * c) Is a hydrogel with a water content of 80% * d) Contains calcium in asteroid hyalosis * e) Contains collagen which is mainly type II
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