Mammalian (Human) alimentary Canal comprises mouth, buccal cavity, pharynx, oesophagus, stomach, small intestine(duodenum, jejunum and ileum), Large intestine (caecum, Colon and rectum) and anus
Mouth is bounded by Two Lips open into oral cavity.
Buccal cavity contains teeth and tounge, and receives saliva from 3 pairs of salivary gland (parotid, submaxilary, sublingual, )
Teeth are meant for cutting and mastication of food
Buccal cavity of a men. The mouth is a slit- like aperature bounded by two lips. It leads to buccal cavity. its roof is formed of hard plate, and hangs as uvula. the side of buccal cavity is formed of cheeks. At the floor is present a musculo-sensory organ called tounge.
Pharynx. It is a vertical tube. It is a cross passage for both air and food. It has uvula and epiglottis which closes the internal nares and glottis respectively during swallowing of food to ensure the passage of food into oesophagus (food pipe)
Oesophagus. It is 25cm long narrow muscular straight tube. It runs downward through the chest behind heart and passes through diaphragm into the abdomen here, it opens into stomach oesophagus propels the swallowed food into stomach.
Stomach of man. It is a sac like structure situated in the upper part of abdominal cavity below the diaphragm. Large part of this sac is situated left of the median line.
Small intestine. It is the longest part of alimentary canal. It is thin walled and highly coiled tubular structure. It is about 3 to 3.5m long and occupies most part of abdominal cavity. It is coiled upon itself. It is diffrentiated into 3 regions, viz., duodenum, jejunum and ileum.
Duodenum is 25cm long C- shaped. It recieves the opening of bile pancreatic duct. It also recieves the opening of stomach.
Jejunum is 90cm long. It lies above and left beyond duodenum.
Ileum is 180cm long its inner linning is thrown into numerous villi.
Large intestine. The large intestine is about 1.5m long. It is divided into following parts i.e,the vermiform appendix, the colon and the rectum. Caecum is blind tube and represented by vermiform appendix(5-8cm) and is present below the junction of small and large intestine. Rectum is the last part and opens to outside by anus gaurded by anal sphincter.
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| Human Alimentary Canal |
Buccal cavity contains teeth and tounge, and receives saliva from 3 pairs of salivary gland (parotid, submaxilary, sublingual, )
Teeth are meant for cutting and mastication of food
Pharynx. It is a vertical tube. It is a cross passage for both air and food. It has uvula and epiglottis which closes the internal nares and glottis respectively during swallowing of food to ensure the passage of food into oesophagus (food pipe)
Duodenum is 25cm long C- shaped. It recieves the opening of bile pancreatic duct. It also recieves the opening of stomach.
Jejunum is 90cm long. It lies above and left beyond duodenum.
Ileum is 180cm long its inner linning is thrown into numerous villi.
Large intestine. The large intestine is about 1.5m long. It is divided into following parts i.e,the vermiform appendix, the colon and the rectum. Caecum is blind tube and represented by vermiform appendix(5-8cm) and is present below the junction of small and large intestine. Rectum is the last part and opens to outside by anus gaurded by anal sphincter.
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