3.03 Remember the structures of the sensory system

1. 3.03 Remember the structures of the sensory system

2. Essential questions What are the structures of the sensory system? 3.03 Remember the structures of the sensory system

3. The Senses • Eyes • Sight • Ears • Hearing • Nose • Smell • Tongue • Taste • Skin • Touch 3.03 Remember the structures of the sensory system

4. Eyes 3.03 Remember the structures of the sensory system

5. Protection • The eye is protected by the orbital socket of the skull, eyelids, the eyebrows and eye lashes • The protective membrane over the eye is the conjunctiva • When we blink, the eyes are constantly bathed in fluid secreted by the lacrimal glands. • The tears contain lysozymes which help combat bacterial infections • The eye is made of up 3 layers: Sclera, choroid and retina 3.03 Remember the structures of the sensory system

6. Question • Name the disorder that is inflammation of the membrane that lines the eye…sometimes called “Pink Eye” 3.03 Remember the structures of the sensory system

7. Answer • Conjunctivitis 3.03 Remember the structures of the sensory system

8. Sclera • The outermost layer • The white of the eye • Maintains the shape of the eye and protects the structures within • The muscles that move the eye are the extrinsic muscles • On the anterior portion of the eyeball it forms the cornea 3.03 Remember the structures of the sensory system

9. Question • What is known as the window of the eye? • A. Iris • B. Retina • C. Cornea • D. Sclera 3.03 Remember the structures of the sensory system

10. Answer • Cornea 3.03 Remember the structures of the sensory system

11. Choroid • The middle layer • Contains the iris and the pupil • The iris is the colored portion of the eye • The pupil is the opening that allows for light to enter 3.03 Remember the structures of the sensory system

12. Question • What is the colored portion of the eye? • A. Lens • B. Retina • C. Iris • D. Sclera 3.03 Remember the structures of the sensory system

13. Answer • Iris 3.03 Remember the structures of the sensory system

14. Retina • The innermost layer • Contains the nerve endings that join to the optic nerve • Contains two types of light sensing receptors-rods and cones • Each eye contains millions of receptors: 100 million rods and 3 million cones 3.03 Remember the structures of the sensory system

15. Detached RetinaShaken Baby finding 3.03 Remember the structures of the sensory system

16. Diabetic Retinopathy • Can be caused by hypertension ( BP ) or Diabetes 3.03 Remember the structures of the sensory system

17. Question • What structure contains the optic disc? • A. cornea • B. lens • C. retina • D. sclera 3.03 Remember the structures of the sensory system

18. Answer • Retina 3.03 Remember the structures of the sensory system

19. Glaucoma • Increased pressure in the fluid of the eye which interferes with optic nerve function and vision gradually deteriorates 3.03 Remember the structures of the sensory system

20. Structures of the eyes • Rods and cones • Rods • Active in dim light • Do not perceive color • Cones • Active in bright light • Perceive color 3.03 Remember the structures of the sensory system

21. Question • If someone is colorblind what structure is impaired? • A. Cones • B. Optic Nerve • C. Optoc Disc • D. Rods 3.03 Remember the structures of the sensory system

22. Question • If someone has trouble driving at night what structure is impaired: • A. Cones • B. Optic Disk • C. Rods • D. Optic Nerve 3.03 Remember the structures of the sensory system

23. Answer • Rods • Why? 3.03 Remember the structures of the sensory system

24. Because…. • Rods are active in dim light 3.03 Remember the structures of the sensory system

25. Structures of the eyes • External structures • Orbit • Eyelids • Eyelashes • Conjunctiva • Lacrimal apparatus • Extrinsic muscles 3.03 Remember the structures of the sensory system

26. Structures of the eyes • External structures 3.03 Remember the structures of the sensory system

27. Structures of eyes • Extrinsic muscles 3.03 Remember the structures of the sensory system

28. Eyes • Internal structures-Lens focuses light rays on the retina 3.03 Remember the structures of the sensory system

29. Question • The disorder that deals with clouding of the lens is? • A. glaucoma • B. cataract • C. Macular degeneration 3.03 Remember the structures of the sensory system

30. Answer • Cataract 3.03 Remember the structures of the sensory system

31. Macular Degeneration • A condition which causes loss of central vision needed for driving and reading 3.03 Remember the structures of the sensory system

32. Ears- hearing and balance 3.03 Remember the structures of the sensory system

33. 3 divisions of the ears • External ear • Middle ear • Also known as the tympanic cavity • Inner ear • Also known as the labyrinth 3.03 Remember the structures of the sensory system

34. Structures of the ears • External ear • Pinna or auricle-part we see • Auditory canal or external auditory meatus-middle ear • Ceruminous glands • Tympanic membrane-vibrates with sound waves 3.03 Remember the structures of the sensory system

35. Structures of the ears • Middle ear • Ossicles-3 tiny bones • Hammer or malleus • Anvil or incus • Stirrup or stapes • Eustachian tube- 3.03 Remember the structures of the sensory system

36. Question • Which structure is part of the middle ear? • A. tympanic membrane • B. semicircular canal • C. incus • D. auditory canal 3.03 Remember the structures of the sensory system

37. Answer • Incus 3.03 Remember the structures of the sensory system

38. Disorders • External otitis • Otitis media • Otosclerosis • Meniere’s disease • Tinnitus • Presbycusis • Conductive hearing loss-Ear wax • Sensorineural hearing loss 3.03 Remember the structures of the sensory system

39. Question • Mary has an ear clog impacted with ear wax. Which sensory disorder does she have making it hard for her to hear? • A. Tinnitus • B. Vertigo • C. SensoineuralHearling loss • D. Conductive hearing loss 3.03 Remember the structures of the sensory system

40. Answer • Conductive Hearing Loss-Why? 3.03 Remember the structures of the sensory system

41. ….because • The ear wax is not allowing the sound waves to enter the ear drum 3.03 Remember the structures of the sensory system

42. Question • Owen has a cold and is pulling at his ears. He has a fever and fluid draining from his right ear. Which sensory disorder is he experiencing? • A. Tinnitus • B. Vertigo • C. Meniere’s Disease • D. Otitis Media 3.03 Remember the structures of the sensory system

43. Answer • Otitis Media OM 3.03 Remember the structures of the sensory system

44. Structures of the ears • Inner ear • Cochlea • Perilymph fluid • Semicircular canals • Endolymph fluid • Vestibule chamber 3.03 Remember the structures of the sensory system

45. Question • A construction worker does not wear appropriate hearing protection and is complaining of ringing in his ear. Which sensory order is he experiencing? • A. Tinnitus • B. Vertigo • C. SensoineuralHearling loss • D. Conductive hearing loss 3.03 Remember the structures of the sensory system

46. Answer • Tinnitus 3.03 Remember the structures of the sensory system

47. Nose 3.03 Remember the structures of the sensory system

48. Structures of the nose • Nares • Nasal cilia • Nasal septum • Olfactory receptors • Turbinates 3.03 Remember the structures of the sensory system

49. Structures of the nose 3.03 Remember the structures of the sensory system

50. Structures of the nose • Olfactory area 3.03 Remember the structures of the sensory system