Chap. 15 Special Senses

Special Senses Multiple Choices: 1. The middle layer of the eye is called a. sclera b. uvea (composed of the ciliary body, iris, and choroid) c. retina 2. Ocular disorder characterized by increased intraocular pressure is a. glaucoma b. myopia c. presbyopia 3. Farsightedness is also known as a. hyperopia b. myopia c. presbyopia 4. The center part of the eye that contains a lot of cones a. fovea centralis b. optic disk c. optic nerve 5. The ___ is responsible for vision in poor light or in the dark a. rods b. cones c. a & b d. neither 6. Structure responsible for equalizing air pressure inside the middle ear with that of the outside atmosphere. a. auditory canal b. Eustachian tube c. auditory tube d. b & c 7. Taste receptors at the tip of the tongue is responsible for a. sweet and salty b. sour c. bitter 8. The sense of smell or the olfactory sense is a function of this nerve a. optic nerve b. olfactory nerve c. occulomotor nerve

9. The ___ is the outermost white hard layer of the eye composed of tough collagenous connective tissue a. sclera b. choroid c. retina 10. The innermost layer of the eye that contains light sensitive cells called rods and cones is the a. sclera b. choroid c. retina 11. The ___ is the colored part of the eye surrounding the pupil and regulates the amount of light that can enter the pupil. a. iris b. lens c. cornea 12. The ___ transparent part of the sclera that allows light to enter the eye a. cornea b. iris c. lens 13. The anterior compartment of the eye is filled with a watery fluid called the ___ humor a. aqueous b. vitreous 14. Clouding of the lens occurring usually when one ages is known as a. presbyopia b. cataract c. presbycusis 15. Irregularity in the surface of the cornea / lens causing objects to be blurry and fuzzy a. keraitis b. astigmatism c. presbyopia 16. A condition characterized by inability of both eyes to focus in a single direction causing it to be either divergent or convergent a. strasbismus b. diplopia c. myopia d. hyperopia

Match the structure of the eye to its description or function. a. rod f. uvea b. sclera g. iris c. lens h. fovea d. pupil i. cornea e. cone j. optic disc 24. This part of the eye contains the highest concentration of cones. 25. This is the “white” of the eye. 26. This is the clear part of the sclera, sometimes called the window of the eye. 27. This receptor responds in dim light and for night vision. 28. This is actually a hole in the eye that lets light in. 29. This part of the eye is called the blind spot; it is where the optic nerve leaves the eye. 30. This receptor responds in bright light and is able to distinguish colors. 31. This is the structure that is the colored part of the eye and can constrict or dilate the pupil. 32. This is the middle layer of the eyeball that contains dark pigment. 33. This structure is directly behind the pupil and is used to focus light. Multiple Choice: 34. This part of the ear contains the Eustachian tube which equalizes the air pressure in the middle ear with the outside atmosphere. a. external ear b. middle ear c. inner ear 35. The foot part of the stapes goes into the a. round window b. oval window c. circular window 36. The middle of the three ossicles is the a. hammer b. anvil c. stirrup 37. The bony labyrinth consists of the following except a. semi-circular canals b. utricle c. cochlea 38. The membranous labyrinth is where the ______ fluid circulates. a. perilymph b. endolymph c. exolymph

39. The auditory center lies in which part of the brain? a. parietal lobe b. temporal lobe c. occipital lobe 40. The auditory nerve is also known as the a. vestibule-cochlear nerve b. facial nerve c. trigeminal nerve 41. Causes of conductive hearing loss includes the following a. impacted cerumen b. otosclerosis c. both a and b 42. Abnormal ringing of the ear is called as a. tinnitus b. vertigo c. otophonia 43. The specialized sebaceous glands located in the ear canal and lubricates it is called a. Montgomery’s glands b. Ceruminous glands c. Sudoriferous glands 44. Most common cause of nerve deafness is a. exposure to sudden loud noise b. tumor involving the cochlea c. both a and b 45. Sound waves can be transmitted inside the ear either by a. air conduction b. bone conduction c. nerve conduction d. all of the above e. a and b 46. Which part of the inner ear is responsible for hearing? a. semicircular canals b. vestibule c. cochlea 47. The fluid circulating the within the bony labyrinth but outside the membranous labyrinth a. perilymph b. endolymph c. exolymph 48. Which part of the inner ear is responsible for maintaining equilibrium? a. semicircular canals b. vestibule c. a and b