st nd Anatomy – 1 year – 2 semester Internal organs The Digestive sys. General function of digestive sys. 1) Digestion – there are 2 kinds of digestions . a. Mechanical digestion – begins in oral cavity n continue till small intestine. b. Chemical digestion - begins inside small intestine and continues till anus. Digestion is important to break down food in to forms that can be absorbed and used by body cells . 2) Absorption and secretion of chemicals Digestive sys has 2 parts- o Digestive canal o Alimentary canal (nourishment- alimentary) Additional organs the digestive sys . - teeth , tongue , glands (salivary glands , liver , pancreas, gold bladder ) These accessory digestive oragns never come to the direct contac with food. Alimentary canal Start- from mouth , Finish- by anus A.C. devided into 3 parts * Anterior * Middle * Posterior Anterior part of A.C. Organs of anterior part - Oral cavity- food enter - pharynx- foods continue - esophagus - Stomach Middle part of A.C. Small intenstine 3parts- 1) Duodenum – short part of small intestine 2) jejunum 3) illeum posterior part of A.C. large intestine part – 1) cecum 2) colon – ascending colon transvers colon descending colon zygmoid colon 3) rectum- finish by anus 1st part of the A.C. Oral cavity Generally 2 parts – 1)vestibular part- <katawahagena pimbuwahama> 2)proper oral cavity * rima auris – fisher between the opening of the mouth. vestibular part walls 1) anterior – lips in front 2) posterior- teeth 3) lateral – cheeks proper oral cavity – behind the teeth walls 1) superior- palat 2) inferior- floor of the oral cavity , mylo hyoid and genio hyoid M. 3) anterior - teeth 4) laterally – posterior teeth 5) posterior – no wall. Its an opening. opening – isthmus faucium connects the oral cavity with pharings . (check the picture in the note book) soft palat- formed by M. 1) tensore vele palatery M . – tense 2) Levator vele palatery M. – elevates 3) Uvula M. 4) Palato glossal M. 5) Palato pharyngeal M . Hard palat- horizontally Soft palat – slights in vertically direction Vertical part is formed by 2M. 1) tensore vele palatery M . - tense 2) Levator vele palatery M. - elivates Middle part of the soft palate uvula. Uvula is formed by uvula M . which is coverd by mucosa . In the lateral side up to downward 2M. 1) palato glossal M starts – soft palate finish - from tongue 2) palato pharingeal M. – same direction of palate glossal M . attach to the lateral wall. Start- soft palate Ends- phariynx behind palato glossal M is Palato pharingal M. oral cavity , stomach and all the organs are covered by mucosa. It is a mucous membrane . Palato glossal arch Palato pharyngeal arch . Between these 2 arch paired palatine tonsils/ lymphatic glands. Palat without mucosa has 3 paired salivary glands 1) small salivary glands- located under the mucosa of palat, cheek, lips and everywhere in the oral cavity 2) large salivary glands- paratoid and sublingual (under the tongue) , sub mandibuler. 1) Largest – parotid salivary gland , under the acustic metus 2) Sub lingual gland - under the tongue. Between the tongue and the mylo hyoid M . 3) Sub mandible gland - under the mylo hyoid M. Tongue Advantages of T ? 1) Moves food to the oral cavity and down to the pharynx . 2) Organ of the taste 3) Speak Where the tongue is located ? in the oral cavity T . has 2 sufaces – o Superior surface / upper surface / dorsal surface- Faces to the palat o Inferior surface – faces to the mylohyoid n geniohyoid M floor of the oral cavity <oral diaphragma> 2 lateral borders- * right *left T. devides in to 3 parts – o Anterior end / apex o Middle large part /body o Posterior part/ root/ radix , In the dorsal surface of the T. hv, terminal line . - Border between the body n root . it separats the root n body of T .