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单词 Canalis alimentarius
释义

Canalis alimentarius

英语百科

Human gastrointestinal tract

General structure of the gut wall
1: Mucosa: Epithelium2: Mucosa: Lamina propria3: Mucosa: Muscularis mucosae4: Lumen5: Lymphatic tissue6: Duct of gland outside tract7: Gland in mucosa8: Submucosa9: Glands in submucosa10: Meissner's submucosal plexus11: Vein12: Muscularis: Circular muscle13: Muscularis: Longitudinal muscle14: Serosa: Areolar connective tissue15: Serosa: Epithelium16: Auerbach's myenteric plexus17: Nerve18: Artery19: Mesentery

The human gastrointestinal tract (GI tract or GIT) is an organ system responsible for transporting and digesting foodstuffs, absorbing nutrients, and expelling waste.

The tract consists of the stomach and intestines, and is divided into the upper and lower gastrointestinal tracts. The GI tract includes all structures between the mouth and the anus, forming a continuous passageway that includes the main organs of digestion, namely, the stomach, small intestine, and large intestine. In contrast, the human digestive system comprises the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder). The tract may also be divided into foregut, midgut, and hindgut, reflecting the embryological origin of each segment.

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