Human Digestive system
Oral cavity - 1) Palate - the roof of oral cavity is called as palate. Anterior part of palate is called as hard palate which bears transverse ridges the rugae . The posterior part of palate is smooth and is termed as soft palate . The hinder free part of the soft palate freely hangs down as a small flap which is called uvula . 2) Tongue - it is a voluntary muscular and glandular structure which occupies the flour of the mouth it is attached to the floor of the mouth by a fold called as lingual frenulum . An inverted v shape furrow termed as sulcus terminalis divide the upper surface of tongue into anterior oral part and posterior oral part . The apex of the sulcus terminalis projects backwards and is marked by a small medium pit named the foramen caecum . 3) Papillae - the upper part of tongue has four types of papillae: a) ...