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The wall of the alimentary canal has four basic tissue layers: the mucosa, submucosa, muscularis, and serosa. ... image/svg+xml. data size. 527,971 byte. checksum.
English: The gastrointestinal tract, also called the digestive tract, alimentary canal, or gut, is the system of organs within multicellular animals that takes in food, digests it to extract energy and nutrients, and expels the remaining waste.
The gastrointestinal tract (GI tract, digestive tract, alimentary canal) is the tract or passageway of the digestive system that leads from the mouth to the anus. The GI tract contains all the major organs of the digestive system, in humans and other animals, including the esophagus , stomach , and intestines .
In the oesophagus, pharynx and external anal canal the epithelium is stratified, squamous and non-keratinising, for protective purposes. In the stomach, the epithelium is simple columnar, and is organised into gastric pits and glands to deal with secretion. [1] In the small intestine, epithelium is simple columnar and specialised for absorption.
Gizzard of a chicken. The gizzard, also referred to as the ventriculus, gastric mill, and gigerium, is an organ found in the digestive tract of some animals, including archosaurs (birds and other dinosaurs, crocodiles, alligators, pterosaurs), earthworms, some gastropods, some fish, and some crustaceans.
The crop (also the croup, the craw, the ingluvies, and the sublingual pouch) is a thin-walled, expanded portion of the alimentary tract, which is used for the storage of food before digestion. The crop is an anatomical structure in vertebrate animals, such as birds , and invertebrate animals, such as gastropods (snails and slugs), earthworms ...
More than 50,000 years ago, humans painted a hunting scene in a cave in Indonesia that archaeologists say represents the oldest known example of storytelling in art history.
In the Renaissance of the 16th century, Leonardo da Vinci produced some early drawings of the stomach and intestines. He thought that the digestive system aided the respiratory system. [53] Andreas Vesalius provided some early anatomical drawings of the abdominal organs in the 16th century.