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This is the secretory part of the stomach. Then the food passes into the gizzard (also known as the muscular stomach or ventriculus). The gizzard can grind the food with previously swallowed grit and pass it back to the true stomach, and vice versa. In layman's terms, the gizzard 'chews' the food for the bird because it does not have teeth to ...
In anatomy, rugae (sg.: ruga) are a series of ridges produced by folding of the wall of an organ. [1] In general, rugae are a biological feature found in many organisms, serving purposes such as increasing surface area, flexibility, or structural support. Most commonly rugae refers to the gastric rugae of the internal surface of the stomach.
The genus is unique because it contains the only two known frog species that incubated the prejuvenile stages of their offspring in the stomach of the mother. [3] The combined ranges of the gastric-brooding frogs comprised less than 2,000 square kilometres (770 sq mi).
Also known as the Northern Glass Frog, this frog's physical features include primarily green skin, which also reflects visible light typically at 400 nm to 700 nm, [5] pale yellowish spots, yellow fingertips and translucent skin covering its stomach. A sheet of guanine stretches over several internal organs, but leaves others parts such as the ...
The skin fragments that were found in their stomach are an indication that these frogs commit cannibalism or eat their own skin which is common among amphibians. Based on these results, P. pipa is an ambush predator that will opportunistically eat anything that falls into the water or that it may encounter when occasionally foraging on land. [14]
The female gastric-brooding frog (Rheobatrachus sp.) from Australia, now probably extinct, swallows her fertilised eggs, which then develop inside her stomach. She ceases to feed and stops secreting stomach acid. The tadpoles rely on the yolks of the eggs for nourishment.
The proventriculus is a standard part of avian anatomy, and is a rod shaped organ, located between the esophagus and the gizzard of most birds. [2] It is generally a glandular part of the stomach that may store and/or commence digestion of food before it progresses to the gizzard. [3]
A gastrolith, also called a stomach stone or gizzard stone, is a rock held inside a gastrointestinal tract. Gastroliths in some species are retained in the muscular gizzard and used to grind food in animals lacking suitable grinding teeth. In other species the rocks are ingested and pass through the digestive system and are frequently replaced.