Re: Orbit and Globe - Learning Objectives and Review Questions

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: : Orbit and Globe - Learning Objectives and Review Questions : : True/False : : True/False - October 08, 2011 : : 1. The ciliary body receives postganglionic fibers from the ciliary ganglion and adjusts the lens for focusing on near objects. True. : : 2. The lacrimal canaliculi drain into a common canaliculus, the lacrimal sac, then the nasolacrimal duct, to drain into the middle nasal meatus. False- inferior. : : 3. Eye drop medications may activate SVA receptors on the posterior 1/3 area of the tongue. True- glossopharyngeal. : : 4. The superior tarsal plate is elevated by striate muscle with assistance from smooth muscle. True- superior tarsal muscle and levator palpabrae superioris. : : 5. Frank ptosis, not mild ptosis, may reflect a lesion of the superior division of the oculomotor nerve. True? Mild is sympathetic denervation. : : 6. The facial nerve mediates closing of the eyelids and the trochlear nerve mediates opening the eyelids. False- oculomotor, GSE. : : 7. The superior tarsal muscle is innervated by fibers having their cell bodies in the superior cervical sympathetic ganglion. True. Hence the ptosis? : : 8. The greater wing of the sphenoid bone contributes borders to the superior and inferior orbital fissures. True- superior fissure formed between greater and lesser, inferior fissure between maxilla and greater wing : : 9. The lesser wing of the sphenoid bone contributes a border to the superior orbital fissure. True. : : 10. The palatine, ethmoid, and lacrimal bones contribute to the lateral border of the orbit. False- medial is ethmoid, lacrimal and maxillary. Lateral is zygomatic and greater wing of the sphenoid : : 11. A blow to the face that fractures the maxilla may damage the infraorbital nerve within the orbit. True. Infraorbital nerve exits via infraorbital foreman in maxilla. : : 12. Passing through the annulus tendineus, but not the superior orbital fissure, is the ophthalmic artery. True. : : 13. The ophthalmic division of the trigeminal nerve elaborates nerves that pass through the annulus tendineus and nerves that pass through the superior and inferior orbital fissures but not through the annulus tendineus. False- what happened to nasociliary? : : 14. The four rectus muscles, but not the levator palpebrae superioris, originate from the annulus tendineus. True- it arises immediately superior to it. : : 15. Of the six muscles that move the globe, one does not originate from the region of the apex of the orbit. True. The inferior oblique. : : 16. Rotation of the globe around the vertical axis is primarily mediated by the medial and lateral rectus muscles. True. : : 17. Intorsion of the eye is primarily mediated by the inferior oblique. False. Superior oblique. : : 18. The axis of the orbit is 23 degrees lateral to the primary visual axis.True. : : 19. A secondary action of the superior and inferior rectus muscles is adduction. True. : : 20. The superior rectus has a tertiary action of intorsion and the inferior rectus has a tertiary action of extorsion. True. : : 21. Tilt your head while looking at your iris and in the mirror and you will notice that your globe remains "stationary." : : 22. The trochlear, lacrimal, and frontal nerves pass through the superior orbital fissure but not through the annulus tendineus. True : : 23. The lateral rectus muscle has two heads of origin that create an osseofibrous foramen in conjunction with superior orbital fissure. : : 24. The lacrimal nerve is conveying GVE parasympathetic and GVE sympathetic fibers to the lacrimal gland. True- all post-ganglionic, non-native : : 25. The fibers that contribute to the anterior ethmoid nerve traveled, in order, through the posterior cranial fossa, middle cranial fossa, orbit, ethmoidal air cells, anterior cranial fossa, nasal cavity, and face. : : 26. The fibers that contribute to the anterior ethmoid nerve traveled, in order, through the superior orbital fissure, anterior ethmoidal foramen, region of the cribriform plate, and an unnamed foramen on the bridge of the nose. True- a unnamed foreamen= slit lateral to crista galli. : : 27. The arterial supply to the globe enters through the optic canal. True- the opthalmic artery. : : 28. Intractable nose bleeds can be treated with orbital surgery. True- apparently. : : 29. The ophthalmic arterial distribution forms anastomoses with the facial arterial distribution within the nasal cavity and at the orbital margin. True.

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