1. Chap 11 The Sensory System
Memmler’s A&P
Chap 11 The Sensory System

2. Sensory system p236 Receives stimuli Initiates nerve impulse
Sensory receptors
Special senses
General senses

3. Structure of the eye tunics Sclera Choriod Retina Chambers of the eye
Eye p236
Structure of the eye
tunics
Sclera
Choriod
Retina
Chambers of the eye
Anterior chamber
Posterior chamber

4. Protection for the eye p 236-237
Skull
Eyelids
Eyelashes
Eyebrows
Conjunctiva
Tears

5. Pathway of light thru the eye p237
Refraction
Path of light:
Cornea
Aqueous humor
Lens
Vitreous body
Light is focused on retina at the fovea centralis

6. The Retina 238
Rods
Cones

7. Extrinsic muscles p239
Allow the eyes to move

8. Intrinsic muscles p240
Form the iris and the ciliary muscle

9. Accomodation p241

10. Function of the iris p 240

11. Errors of refraction/eye disorders p242
Hyperopia
Myopia
Astigmatism
Strabismus
Cataract
Glaucoma
Macular degeneration
Retinopathy
Retinal detachment
Presbyopia

12. The Ear p245
Sections:
Outer ear
Middle ear
Inner ear

13. Ossicles p 245

14. Inner ear p246

15. Disorders of the ear p247 Otitis media Otitis externa
Hearing loss: conductive or sensorineural
Presbycusis

16. Sense of taste p249 Gustation Taste buds located on tongue
Taste contributes to appetite

17. Sense of smell p250 Olfaction
Receptors located in epithelium of upper nasal cavity
Smell contributes to appetite

18. Sense of touch p250
Tactile corpuscles are located in dermis of skin

19. Sense of pain p252 Widely distributed free nerve endings
2 pathways for pain transmission to brain
Acute, sharp pain
Slow chronic pain

20. Sense of position p251
Proprioceptors: Receptors located in muscles, tendons, joints relay impulses to the brain (cerebellum)

21. Sensory adaptation 253
When sensory receptors are exposed to a continuous stimulus, receptors often adjust themselves so that the sensation becomes less acute.