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Sinus may refer to:
The umbilical vein is a vein present during fetal development that carries oxygenated blood from the placenta into the growing fetus. The umbilical vein provides convenient access to the central circulation of a neonate for restoration of blood volume and for administration of glucose and drugs.
Arcus may refer to:
In the fetus, the ductus venosus shunts a portion of umbilical vein blood flow directly to the inferior vena cava. Thus, it allows oxygenated blood from the placenta to bypass the liver. Compared to the 50% shunting of umbilical blood through the ductus venosus found in animal experiments, the degree of shunting in the human fetus under physiological conditions is considerably less, 30% at 20 weeks, which decreases to 18% at 32 weeks, suggesting a higher priority of the fetal liver than previously realized. In conjunction with the other fetal shunts, the foramen ovale and ductus arteriosus, it plays a critical role in preferentially shunting oxygenated blood to the fetal brain. It is a part of fetal circulation.
A sinus venosus atrial septal defect is a type of atrial septal defect primarily associated with the sinus venosus.
The sinus venosus is a large quadrangular cavity which precedes the atrium on the venous side of the chordate heart. In mammals, it exists distinctly only in the embryonic heart, where it is found between the two venae cavae. However, the sinus venosus persists in the adult. In the adult, it is incorporated into the wall of the right atrium to form a smooth part called the sinus venarum, which is separated from the rest of the atrium by a ridge of fibres called the crista terminalis. The sinus venosus also forms the sinoatrial node and the coronary sinus; in (most) mammals only.
The crista terminalis or terminal crest represents the junction between the sinus venosus and the heart in the developing embryo. In the development of the human heart, the right horn and transverse portion of the sinus venosus ultimately become incorporated with and forms a part of the adult right atrium, where it is known as the sinus venarum. The line of union between the right atrium and the right atrial appendage is present on the interior of the atrium in the form of a vertical crest, known as the crista terminalis or crista terminalis of His. The crista terminalis is generally a smooth-surfaced, thick portion of heart muscle in a crescent shape at the opening into the right atrial appendage. On the external aspect of the right atrium, corresponding to the crista terminalis is a groove, the terminal sulcus. The crista terminalis provides the origin for the pectinate muscles.
Crista dividens is a structure in the developing heart of the human embryo that divides the right atrium in a way such that it creates a pan systolic murmur in the same way as the foramen ovale. Recognition of the absence of this murmur can indicate a potentially terminal cardiac defect in the newborn.
Dardanus venosus, the starry-eyed crab or stareye crab, is a species of hermit crab in the family Diogenidae. It occurs in shallow water on the eastern coasts of America from Florida southward to Brazil. It is sometimes kept in reef aquaria.
Heart development refers to the prenatal development of the heart. This begins with the formation of two endocardial tubes which merge to form the tubular heart, also called the primitive heart tube. The heart is the first functional organ in vertebrate embryos.
Adenanthos venosus is a flowering plant from the family Proteaceae that can be found in Western Australia, where its conservation status is Declared Rare Flora. It is 0.4–2 metres long and has either red or pink coloured flowers. The flowers remain in such colour only for one month in winter and then become greyish-white from May to December.
Similosodus is a genus of longhorn beetles of the subfamily Lamiinae, containing the following species:
The veined catfish, also known as the marine catfish, is a species of sea catfish in the family Ariidae. It was described by Achille Valenciennes in 1840. It inhabits tropical marine and brackish waters in the Indo-western Pacific region, including the Mozambique Channel, Myanmar, Indonesia and southern China. It dwells at a depth range of 20 to 50 m. It reaches a maximum total length of 30 cm (12 in), but more commonly reaches a TL of 19 cm (7.5 in).
Similosodus birmanicus is a species of beetle in the family Cerambycidae. It was described by Stephan von Breuning in 1938, originally under the genus Sodus.
Similosodus variolosus is a species of beetle in the family Cerambycidae. It was described by Stephan von Breuning in 1938, originally under the genus Sodus.
Similosodus papuanus is a species of beetle in the family Cerambycidae. It was described by Stephan von Breuning in 1940.
Similosodus palavanicus is a species of beetle in the family Cerambycidae. It was described by Stephan von Breuning in 1939.
Similosodus signatus is a species of beetle in the family Cerambycidae. It was described by Stephan von Breuning in 1939.
Similosodus unifasciatus is a species of beetle in the family Cerambycidae. It was described by Maurice Pic in 1934, originally under the genus Sodus.
Similosodus ursulus is a species of beetle in the family Cerambycidae. It was described by Francis Polkinghorne Pascoe in 1866, originally under the genus Sodus. It is known from Malaysia.
References
- ↑ BioLib.cz - Similosodus venosus. Retrieved on 8 September 2014.