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59 Cards in this Set
- Front
- Back
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What are the six senses?
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Touch, Taste, Smell, Sight, Hearing, Equilibrium
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Touch
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Tactile
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Taste
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Chemicals (Tastants)
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Smell
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Chemicals (Odorants)
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Sight
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Light
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Hearing
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Sound
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Equilibrium
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Balance
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Chemoreceptors
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Chemicals (Touch)
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Thermoreceptors
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Temperature (Touch)
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Mechanoreceptors
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Mechanical Forces (Touch)
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Nociceptors
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Pain (Touch)
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Taste receptor cells (modified epithelial cells)
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Present in taste buds, modified skin cells, taste replaced every 7-10 days
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Taste Buds
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Usually found on tongue, present in taste receptor cells
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4 Kinds of Papillae
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Vallate, fungiform, filiform, foliate
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Vallate
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(Circumvallate) - Big bumps on back of tongue - V shape
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Fungiform
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Tip of tongue, Taste Buds
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Filiform
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No taste buds - grips food
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Foliate
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Ridges on side of Tongue - Taste Buds
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Gustatory Pathway
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Innervated by sensory nerves (Nerves VII, IX, X)
-Info. goes through medulla oblongata and thalamus to gustatory cortex |
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Olfactory receptor cells
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Present in nasal cavity
-Replaced every 30-60 days |
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Olfactory Pathway
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ORC axons from cranial nerve 1
-ORC axons project into the CNS (olfactory bulb) -Info. conveyed to the olfactory cortex in temporal lobes |
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Visual receptor cells (photoreceptors)
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-rods and cones
-Don't regenerate |
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Conjunctiva
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Mucous membrane covering anterior eye and inner surface of eyelid
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Lacrimal apparatus
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Gland, canaliculi, sc, nasolacrmal duct
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Lacrimal gland
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Produces tears
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Lacrimal canaliculi
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Tubes that drain tears
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Lacrimal sac
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Collect tears
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Nasolacrimal duct
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Empties tears into nasal cavity
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3 Layers of external wall of eye
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Fibrous Tunic, Vascular Tunic, Neural Tunic
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Fibrous tunic
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Protects eye
-Sclera and cornea |
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Sclera
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White Part
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Cornea
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Transparent, light passes into eye
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Vascular tunic
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many blood vessels, neurish and protect eye
-choroid, ciliary body, iris |
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Choroid
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Highly vascular layer
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Ciliary body
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Smooth muscle
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Iris
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Colored part, varies size of pupil
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Neural tunic (retna)
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-Vision
-photoreceptors, macula lutea, fovea centralis, optic disc |
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Photoreceptors
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Rods & Cones
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Macula Lutea
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Forms posterior pole
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Fovea centralis
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Area of greatest visual acuity
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Optic Disc
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Blind Spot, axons, blood vessels exit
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Lens
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Transparent, focuses light
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Suspensory ligament
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Connects to ciliary body-adjust size of lens
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Anterior chamber
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Area in front of lens
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Aqueous humor
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Watery fluid in the anterir segment
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Posteriror Chamber
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Area behind the lens
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Vitreous humor
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Jelly like substance in posterior segment
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Optic Nerve
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Cranial nerve 2
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Optic Chiasm
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Crossing of some fibers
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Optic tract
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-Fibers go to superior colliculi
-most fibers go to thalamus to visual cortex |
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External Ear
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Auricle, external auditory canal, tympanic membrane
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Auricle (Pinna)
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Collects sound waves
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External auditory canal
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Sound waves run through
-ceruman gland - prduces ear wax - H2O proof and moist |
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Tympanic membrane
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-Ear drum, highly innovated, double layer of cells, flat cone with apex pointed in
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Middle Ear
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Malleus, Incus, Stapes
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Inner Ear (Hearing)
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Cochlea, Hair Cells
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Inner Ear (Euilibrium)
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Semicircular canas, ampullae, hair cells
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Vestibule
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Utricle, Saccule, Hair cells
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Nerve
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Auditory canal to auditory structure
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