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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.
Most female insects have an egg-laying tube, or ovipositor; it is absent in termites, parasitic lice, many Plecoptera, and most Ephemeroptera. Ovipositors take two forms: The anal-genital part of the abdomen. which consists generally of segments 8 or 9 to the abdominal apex; substitutional, composed of extensible posterior abdominal segments.
Cloaca of a red-tailed hawk. A cloaca (/ k l oʊ ˈ eɪ k ə / ⓘ kloh-AY-kə), pl.: cloacae (/ k l oʊ ˈ eɪ s i / kloh-AY-see or / k l oʊ ˈ eɪ k i / kloh-AY-kee), or vent, is the rear orifice that serves as the only opening for the digestive (), reproductive, and urinary tracts (if present) of many vertebrate animals.
The abdominal cavity is a large body cavity in humans [1] and many other animals that contain organs. It is a part of the abdominopelvic cavity . [ 2 ] It is located below the thoracic cavity , and above the pelvic cavity .
The hollow organs of the abdomen are the stomach, intestines, gallbladder, bladder, and rectum. [6] In the thoracic cavity, the heart is a hollow, muscular organ. [7] Splanchnology is the study of the viscera. [8] The term "visceral" is contrasted with the term "parietal", meaning "of or relating to the wall of a body part, organ or cavity". [9]
The navel (specifically abdominal wall) would be considered an umbilical hernia if the protrusion were 5 centimeters or more. The diameter of an umbilical hernia is usually 1/2-inch or more. [ 9 ] While the shape of the human navel may be affected by long term changes to diet and exercise, unexpected change in shape may be the result of ascites .
For example, the stomach is covered with a lining called the visceral peritoneum, as opposed to the parietal peritoneum. Viscus can also be used to mean "organ". [57] For example, the stomach is a viscus within the abdominal cavity, and visceral pain refers to pain originating from internal organs.
He used those principles to study the primordial elements of the nature of which the bodies of animals are composed and the intrinsic conditions that make bodies become what they are. First they start from the combination of the fundamental elements of nature (earth, water, air and fire) forming tissues and these organs.