1. SensesSenses Objective 4-5

3. Peripheral Nervous System (PNS) All nerves not in the brain or spinal cord Two divisions: –Somatic –Autonomic Sympathetic Parasympathetic

4. Sensory Organs Clusters of specialized nerves 1.Eyes - photoreceptors 2.Ears - mechanoreceptors 3.Skin – mechanoreceptors, thermoreceptors, and pain receptors 4.Tongue - chemoreceptors 5.Nose - chemoreceptors

5. Eye Choroid Retina Blood vessels Optic nerve Fovea Vitreous humor Sclera Ligaments Iris Pupil Cornea Aqueous humor Lens Muscle

6. Ear Auditory canal Tympanum Round windowEustachian tube Bone Cochlea Cochlear nerve Semicircular canals Oval window Stirrup Anvil Hammer

7. Skin mechanoreceptors, pain receptors and thermoreceptors Spread all over the skin Sensory clusters in lips and hands

8. Tongue Taste buds taste Each bud has the ability to taste: 1.Bitter 2.Sour 3.Salty 4.Sweet 5.Savory (Umami)

9. Nose/Mouth Cerebral cortex Nasal cavity Taste bud Smell sensory area Taste sensory area Thalamus Olfactory (smell) bulb Olfactory nerve Smell receptor Taste pore Taste receptor Sensory nerve fibers