Anatomy of the Mouth and Esophagus CH 23 Anatomy of the Mouth and Esophagus James F. Thompson, Ph.D.

Mouth External Structures Cheeks Lips (labia) Vestibule – the space between the cheeks and gums These structures are evolutionary inventions of the mammals which improved food processing.

Mouth Oral cavity proper - from teeth and gums to fauces Palates: hard & soft – separate oral from nasal cavity

Teeth chop and grind food; speech articulators

Tongue A complex versatile (tasty!) skeletal muscle which forms the floor of the oral cavity Covered with papillae filiform fungiform circumvalate taste buds Lingual tonsils Circumvalate Fungiform Filiform

Three Pairs of Extrinsic Salivary Glands

Pharynx

General Histology of GI Tract Same histological organization from inside to outside and from end to end

Esophagus esophagus dorsal to trachea

Esophagus Muscular collapsible tube 23-25 cm long

Hiatal Hernia

Esophageal Reflux Disease Esophageal Varices  Esophageal Adenoma

End CH 23 Anatomy of the Mouth and Esophagus