anatomy Ch26h - Human Anatomy McKinley & O'Loughlin...

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Human Anatomy Chapter 26: Digestive System General Structure and Functions of the Digestive System The digestive system consists of the digestive organs (making up the digestive or gastrointestinal [GI] tract or alimentary canal) and the accessory organs General Structure of the Digestive System The GI tract Smooth muscle Accessory digestive organs: Functions of the Digestive System 1. Ingestion 2. Digestion Mechanical digestion Chemical digestion 3. Propulsion Peristalsis Segmentation
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4. Secretion 5. Absorption 6. Elimination Oral Cavity (mouth) Margins: anteriorly posteriorly superiorly (roof ) inferiorly (floor) Vestibule Oral cavity proper The lateral walls are formed by the cheeks Lips (labia) Gingivae Labial frenulum Palate The hard palate The soft palate The uvula Tongue Bolus
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The lingual frenulum Numerous small projections (papillae) cover the superior (dorsal) surface. Lingual tonsils Salivary Glands Collectively produce and secrete saliva. Three pairs of large, multicellular salivary glands: Parotid glands Submandibular glands Sublingual glands Functions of Saliva Teeth Collectively known as the dentition Responsible for mastication Crown Neck Root Collectively, the roots, the dental alveoli, and the periodontal ligament that binds the roots to the alveolar processes form a gomphosis joint. Teeth
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anatomy Ch26h - Human Anatomy McKinley & O'Loughlin...

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