 Dear students, in this topic, we shall discuss the parts of the elementary canal present in the head gut. Head gut is the anterior region of elementary canal, which receives food through ingestion. It consists of structures for feeding and swallowing. These parts include the buckle cavity and pharynx. The buckle cavity is the space behind the mouth. Mouth is an opening and the inner part is called buckle cavity. Buckle cavity has many associated structures. For example, mouth parts are jaws, teeth, tongue and slivery glands. Due to these parts, buckle cavity performs many functions. We shall discuss these functions one by one. The first function of buckle cavity is the selection of food. Buckle cavity selects food through taste and feeling. If taste or feeling is not good, then food is rejected and if it feels a good taste and feeling, food is swallowed. The second function of buckle cavity is to handle the food and masticate it. These processes involve teeth and tongue. Teeth are present in all vertebrates and are used for holding, and tongue are tearing the prey or food. They also grind the food by a process which is called mastication. Tongue is also present in all vertebrates and assists in grasping, handling and rolling the food during the process of mastication. In mastication, tongue plays an important role during mastication because it plays an important role in handling and handling and handling the intake food or ingested food. It is also very important in the swallowing process. In addition, food selection also helps because it has taste buds, which have gastatory chimo receptors. Dear students, buckle cavity has sliver glands which produce saliva. Sliver lubricates the food material. This lubrication assists in swallowing as well as impartial digestion of starch foods because saliva contains an enzyme which is called slivery amylase. Dear students, after buckle cavity, pharynx comes. The major function of pharynx is swallowing. Swallowing is a process which allows the bolus of food formed after mastication to pass it from the buckle cavity into the esophagus. This process is called swallowing through a process called swallowing. Swallowing is a very sensitive or highly integrated function which involves integrated movement of muscles of tongue and pharynx. It also involves peristaltic movements of esophagus. Swallowing occurs in many steps. First, the tongue pushes the bolus to the back of mouth. The bolus slowly pushes the tongue towards the mouth. Then the soft pellet or uvula moves upward and backwards which closes the nasal opening. After that, larynx moves upward and brings the epiglottis to a horizontal position. This process closes the glottis which is the opening of trachea. This process is very important. Glottis's closing is very important. If this glottis is not closed, food will enter the trachea which will choke the trachea and cause death. Dear students, the beginning of swallowing action is voluntary but once the food reaches the back of buckle cavity near the pharynx, swallowing becomes involuntary. Which is under the direct neural control of medulla oblongata of the brain.