12 special sense - Special Senses Olfaction Frontal bone...

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Special Senses
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Olfaction Olfactory tract Frontal bone Nasal cavity Hard palate Olfactory bulb Fibers of olfactory nerve Olfactory region Cribriform plate of ethmoid bone (a) Medial view
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Olfactory bulb Supporting cell Olfactory neuron Olfactory vesicle Foramen Axon Dendrite Olfactory tract Cribriform plate Connective tissue Olfactory epithelium Mucous layer on epithelial surface (b) Medial view Anterior Posterior Olfaction Olfactory hairs
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Olfaction Odorants bind odorant receptors on olfactory hairs Depolarization occurs 7 primary classes of odors: camphoraceous, musky, floral, pepperminty, ethereal, pungent, putrid Action potentials terminate : 1. lateral olfactory area – conscious perception of smell 2. medial olfactory area – visceral and emotional reactions to smell 3. intermediate olfactory area – inhibitory role in olfaction
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Taste Posterior Anterior Epithelium Foliate papilla Fungiform papilla Taste bud Vallate papilla Epithelium Filiform papilla Epithelium Epithelium Taste pore Surface of the tongue Taste bud Epithelium Taste cell Gustatory hair Taste bud
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Taste Vallate papilla – V-shaped border between anterior and posterior tongue Fungiform papilla – irregularly scattered on anterior of tongue Filliform papilla – most abundant – anterior of tongue – no taste bud Foliate papilla – sides of the tongue Tastants – dissolved in saliva – taste cells (gustatory) depolarize gustatory cells contain gustatory hairs where depolarization occurs
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Taste Taste buds for salty, sour, bitter, sweet, umami Neuronal Pathways for Taste Gustatory Cells Cranial Nerves IX, X Medulla Oblongata Thalamus Postcentral Gyrus
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Visual System Accessory Structures Eyebrows Eyelids palpebrae palpebral fissure canthi caruncle Conjuctiva palpebral bulbar
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Visual System Puncta Lacrimal gland Lacrimal ducts Nasolacrimal duct Lacrimal sac Lacrimal canaliculi 1 2 3 4 5 Lacrimal Apparatus Production of tears
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Trochlea Superior oblique Anterior Posterior Superior Inferior Medial rectus Optic nerve Lateral rectus Superior rectus Trochlea Superior oblique Superior rectus Lateral rectus Inferior oblique Inferior rectus Optic nerve View (a) Superior view (b) Lateral view
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12 special sense - Special Senses Olfaction Frontal bone...

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