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== Functional organization ==
== Functional organization ==
<p style="text-align:justify;">The digestive system comprises of gastrointestinal tract (GIT) and accessory organs of digestion like teeth (danta), tongue (jihwa), salivary glands (praseka granthi), liver (yakrut) and exocrine part of pancreas (agnyasaya). <br/>Gastrointestinal tract, also known as alimentary canal, is basically a muscular tube extending from the mouth to the anus. At either end, the lumen is continuous with external environment. It measures about 10 m (30 feet) and comprises of following parts:</p>
; Mouth (mukha): : Mouth is a loosely used term to denote the external opening and for the cavity it leads to. Strictly speaking, the term mouth should be applied only for the external opening which is also called oral fissure. The cavity containing anterior two-third of tongue and teeth is the mouth cavity or oral cavity or buccal cavity. The oral cavity extends from the lips to the oropharyngeal isthmus, i.e., junction of the mouth with the pharynx. The oral cavity is subdivided into two parts: the vestibule and oral cavity proper.
* Vestibule lies between the lips and cheeks externally, and the gums and teeth internally.
* Oral cavity proper lies within the alveolar arches, gums and teeth.
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