Dr. Randall E. Merchant
[email protected] THE ORAL CAVITY AND GLANDS Objectives 1. Define the limits of the oral cavity and understand the varying features of the oral mucosa. 2. Compare and contrast the structure of the four types of papillae over the dorsum of the tongue. 3. Describe the basic structure of a taste bud. 4. Define the major subdivisions of a tooth. 5. With the microscope, identify the three types of major salivary glands and the morphologic features that distinguish them from each other. Recognize and know the function of other structures in BOLD in the laboratory guide. 6. Describe the function of striated ducts and how they affect the consistency of the saliva. 7. Identify the structures on the CD listed in the laboratory guide. I. General Features of Oral Cavity A. Definitions 1. Vestibule - internal to the lips and cheeks, as far back as the teeth 2. Oral Cavity Proper - behind the teeth (forward and lateral), bounded above by the hard and soft palate, the tongue below, ends posteriorly at the fauces (beginning of the oropharynx) B. Masticatory Mucosa - present on gingiva, dorsum of tongue, and hard palate 1. Stratified squamous keratinized (parakeratinized) epithelium 2. Underlying connective tissue contains Meissner's corpuscles & minor salivary glands (mostly mucus-secreting) Lingual Minor Salivary Glands Submandibular Duct Frenulum of Tongue Sublingual Gland O penings of Sublingual Ducts Opening of Submandibular Duct C. Lining Mucosa - found everywhere else except gingiva, dorsum of tongue, and hard palate 1. Stratified squamous nonkeratinized epithelium 2. Underlying connective tissue contains Meissner's corpuscles & minor salivary glands (mostly mucus-secreting and classified morphologically as compound tubuloacinar) II.