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Chapter 9.3: The Senses
Taste Pathways Facial, Glossopharyngeal and Vagus Trigeminal—gives us “peppery and spicy hot” Several thousand times more sensitive to taste when smell is involved
Vision Accessory Structures Palpebrae—Eye lids Lubricate Free from dust Protect
Accessory cont… Eyelashes Protections
Accessory cont… Sebaceous Glands In eyelashes Keeps eyelids from sticking Sty—Painful swelling Due to bacterial infection
Accessory cont… Conjunctiva Membrane over eye Very sensitive Conjunctivitis AKA: Pinkeye Damage/irritation to conjunctiva
Accessory cont… Lacrimal Apparatus Produces, distributes and removes tears Constantly “crying” Moistens and cleans Reduce friction Remove debris Prevent bacterial infection Provide nutrients and oxygen to conjunctiva
Accessory cont… Nasolacrimal duct Connects eye to nose
Accessory cont… Extrinsic eye muscles Control eye position
The Eye Fibrous Tunics Outermost layer of the eye Support and protection Attachment site for muscles Assists in focusing
Fibrous tunics cont… Sclera White of the eye Muscles insert here
Fibrous cont… Cornea No blood vessels Limited repair
Vascular tunics Blood vessels for the eye Regulates light into eye Controls shape of lens
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General senses of touch Temperature Pressure Pain.
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