Special Senses Chemical Senses.

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Presentation transcript:

Special Senses Chemical Senses

Olfaction

Nasal Cavity

Nasal Bones: Models

Nasal Bone: Drawings

Nasal Cavity Lining

Olfactory Epithelium Location

Olfactory Mucosa Olfactory Receptor Cells (OC) Basal Cells (BC) Sustentacular Cells (SC)

Olfactory Bulb

Olfactory Modalities Aromatic Fragrant Repulsive Ethereal Resinous Spicy Burned Putrid Gaseous or Volatile Liquids 16 Chemical Elements produce Odor Sensation

Smell Physiology

Olfactory Tract

CN I and Rhinencephalon

CN 1 entering Base of brain at Olfactory Gyrus

Olfaction and the Limbic System

Gustation

Tongue Anatomy

Tongue Papilla

Taste Bud Histology

Taste Bud Stimulus

Taste Maps Sweet Sour Salty Bitter Responds to sugars Responds to AA Responds to H+ Salty Responds to NaCl, salts Responds to metal ions Bitter Responds to alkaloids

Areas of Innervation

Temperature Concentration Order Interaction Taste Sensations

Nerves for Taste: CN VII, IX, XII Chorda tympani of CN 7 Lingual Branch of CN 9 Pharyngeal Branch of CN 10 Myelinated Delta A fibers go to the Nucleus Tractus Solitarius  Thalamus  Parietal Lobe

Gustatory Pathway CN VII, IX, X Medulla Thalamus Parietal Lobe: Gustatory Cortex

Effects on Taste Smell Temperature of food Texture of food Visual appearance of food

Problems Glossitis Cancer of the Tongue

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