This article is about the intestinal structure. For other uses, see Spiral valve (disambiguation).
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The spiral valve of a nurse shark (Ginglymostoma cirratum).
A spiral valve or scroll valve is the corkscrew-shaped lower portion of the intestine of some sharks, Acipenseriformes (sturgeon and paddlefish), rays, skates, bichirs, Lepisosteiformes (gars), and lungfishes. A modification of the ileum, the spiral valve is internally twisted or coiled to increase the surface area of the intestine which increases nutrient absorption.[1]
A spiralvalve or scroll valve is the corkscrew-shaped lower portion of the intestine of some sharks, Acipenseriformes (sturgeon and paddlefish), rays...
Spiral folds of cystic duct (also known as the spiral mucosal folds, spiralvalves of Cina,[citation needed] Amussat valve, or Cina valves) are a series...
its circulatory system is configured similarly to the common fish. The spiralvalve of the conus arteriosus is open, the bypass arterioles of the third and...
some morphological characteristics of their early ancestors, such as a spiralvalve intestine, which is also common to the digestive system of sharks, and...
lining of the spiral intestine is similar to that of the small intestine in teleosts and non-mammalian tetrapods. In lampreys, the spiralvalve is extremely...
erect, it peeks out of the genital slit. Blue whales also have a distal spiralvalve as a spermatic tube. Cetaceans do not have scrotums like terrestrial...
organs around the gonads, Leydig's organ within the esophagus, and a spiralvalve in their intestine, while their thymus and spleen have similar functions...
bony fish because they have retained some primitive features, such as a spiralvalve intestine, but they are not primitive in the sense of not being fully...
lining of the spiral intestine is similar to that of the small intestine in teleosts and non-mammalian tetrapods. In lampreys, the spiralvalve is extremely...
heart valves closing in a healthy 16 year old girl. The stethoscope is at the tricuspid area. Problems playing this file? See media help. A heart valve is...
then to the spiralvalve. The spiralvalve is a coiled organ, it increases surface area so that nutrients can be absorbed. The spiralvalve then empties...
typhlosole that increases the inner surface like the spiralvalve does in some jawed vertebrates. The spiralvalve in the latter develops by twisting the whole...
is achieved by the spiralvalve with multiple turns within a single short section instead of a long tube-like intestine. The valve provides a long surface...
directed via a spiralvalve to the appropriate vessel — aorta for oxygenated blood and pulmonary vein for deoxygenated blood. The spiralvalve is essential...
Shape variable. Absent in some. Intestine Short with spiralvalve in lumen Long with no spiralvalve Rectal gland Present Absent Liver Usually has two lobes...
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