Anatomy of the Digestive System PDF

First year, Second semester, Anatomy subject.((7)). Anatomy of the Digestive System. The digestive tract or gastrointestinal tract ( GIT) is composed of mouth , pharynx, esophagus, stomach , small intestine and large intestine. GIT will help in digestion of food and absorption of needed nutri...

First year, Second semester, Anatomy subject.((7)). Anatomy of the Digestive System. The digestive tract or gastrointestinal tract ( GIT) is composed of mouth , pharynx, esophagus, stomach , small intestine and large intestine. GIT will help in digestion of food and absorption of needed nutrients. Mouth anatomy: Parts of the mouth include the lips, vestibule, mouth cavity, gums, teeth, hard and soft palate, tongue and salivary glands. The gum: The Vestibule (vestibulum oris) is a slit-like space, bounded externally by the lips and cheeks; internally by the gums and teeth. The Lips (labia oris), the two fleshy folds which surround the Rima or orifice of the mouth. The mouth cavity, includes the lips, the lining inside the cheeks and lips, the front two thirds of the tongue, the upper and lower gums, the floor of the mouth under the tongue, the bony roof of the mouth, and the small area behind the wisdom teeth. Hard and soft palate: The hard palate is the front part of the roof of the mouth, and the soft palate is the back part. Hard and soft palate: The hard palate is the front part of the roof of the mouth, and the soft palate is the back part. Esophagus: It is a tube consists of muscles that run both longitudinally and circularly, entering into the abdominal cavity via the right crus of the diaphragm at the level of the tenth thoracic vertebrae. It actively facilitates the passage of the food bolus into the stomach under precise nervous regulation. The esophagus is subdivided into three anatomical segments: cervical, thoracic, and abdominal. The esophagus lies posterior to the trachea and the heart and passes through the mediastinum and the hiatus, an opening in the diaphragm, in its descent from the thoracic to the abdominal cavity. The esophagus has no serosal layer; tissue around the esophagus is called adventitia.