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Superfecundation
Superfecundation is the fertilization of two or more ova from the same cycle by sperm from separate acts of sexual intercourse, which can lead to twin babies from two separate biological fathers. The term superfecundation is derived from fecund, meaning the ability to produce offspring. Homopaternal superfecundation is fertilization of two separate ova from the same father, leading to fraternal twins, while heteropaternal superfecundation is a form of atypical twinning where, genetically, the twins are half siblings – sharing the same mother, but with different fathers. Conception Sperm cells can live inside a female's body for up to five days, and once ovulation occurs, the egg remains viable for 12–48 hours before it begins to disintegrate. Superfecundation most commonly happens within hours or days of the first instance of fertilization with ova released during the same cycle. Ovulation is normally suspended during pregnancy to prevent further ova becoming fertilized an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dizygotic Twin
Twins are two offspring produced by the same pregnancy.MedicineNet > Definition of TwinLast Editorial Review: 19 June 2000 Twins can be either ''monozygotic'' ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or ''dizygotic'' ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell. Since identical twins develop from one zygote, they will share the same sex, while fraternal twins may or may not. In rare cases twins can have the same mother and different fathers (heteropaternal superfecundation). In contrast, a fetus that develops alone in the womb (the much more common case, in humans) is called a ''singleton'', and the general term for one offspring of a multiple birth is a ''multiple''. Unrelated look-alikes whose resemblance parallels that of twins are referred to as doppelgängers. Statistics The human twin birth rate in the United States rose 76% from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Twin
Twins are two offspring produced by the same pregnancy.MedicineNet > Definition of TwinLast Editorial Review: 19 June 2000 Twins can be either ''monozygotic'' ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or ''dizygotic'' ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell. Since identical twins develop from one zygote, they will share the same sex, while fraternal twins may or may not. In rare cases twins can have the same mother and different fathers (heteropaternal superfecundation). In contrast, a fetus that develops alone in the womb (the much more common case, in humans) is called a ''singleton'', and the general term for one offspring of a multiple birth is a ''multiple''. Unrelated look-alikes whose resemblance parallels that of twins are referred to as doppelgängers. Statistics The human twin birth rate in the United States rose 76% from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Superfetation
Superfetation (also spelled superfoetation – see fetus) is the simultaneous occurrence of more than one stage of developing offspring in the same animal. In mammals, it manifests as the formation of an embryo from a different menstrual cycle while another embryo or fetus is already present in the uterus. When two separate instances of fertilisation occur during the same menstrual cycle, it is known as superfecundation. Humans While proposed cases of superfetation have been reported in humans, the existence of this phenomenon in humans has been deemed unlikely. Better explanations include differential growth between twins due to various reasons such as twin-to-twin transfusion syndrome. Artificially induced superfetation has been demonstrated, although only up to a short period after insemination. A 2008 French study found evidence to suggest that superfetation is a reality for humans, but that it is so rare that there have been fewer than 10 recorded cases in the world. In 20 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Castor And Pollux
Castor; grc, Κάστωρ, Kástōr, beaver. and Pollux. (or Polydeukes). are twin half-brothers in Greek and Roman mythology, known together as the Dioscuri.; grc, Διόσκουροι, Dióskouroi, sons of Zeus, links=no, from ''Dîos'' ('Zeus') and '' koûroi'' ('boys'). Their mother was Leda, but they had different fathers; Castor was the mortal son of Tyndareus, the king of Sparta, while Pollux was the divine son of Zeus, who raped Leda in the guise of a swan. The pair are thus an example of heteropaternal superfecundation. Though accounts of their birth are varied, they are sometimes said to have been born from an egg, along with their twin sisters Helen of Troy and Clytemnestra. In Latin the twins are also known as the Gemini (literally "twins") or Castores, as well as the Tyndaridae or Tyndarids.. Pollux asked Zeus to let him share his own immortality with his twin to keep them together, and they were transformed into the constellation Gemini. The pair were regarded ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iphicles
In Greek mythology, Iphicles ( or ; grc, Ἰφικλῆς ''Iphikles''), also called Iphiclus, was the maternal half-brother of Heracles and one of the Calydonian boar hunters. Family Iphicles was the son of Alcmene and her human husband Amphitryon, whereas Heracles was her son by Zeus. He also had a sister, Laonome, who married Euphemus or Polyphemus. Iphicles was the father of Heracles' charioteer Iolaus by his first wife, Automedusa, daughter of Alcathous. Afterwards, he fathered two children by Pyrrha, the younger daughter of Creon. Mythology Iphicles was one night younger than his half-brother Heracles, who strangled the snakes which had been sent by Hera or by Amphitryon, and at which Iphicles was frightened. Iphicles, like his famous brother, grew into a strong man but could not match him in terms of strength. When Heracles was made insane once again by Hera, the hero threw into the fire his brother's two offspring by Pyrrha, who perished as a result. Nevertheles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heracles
Heracles ( ; grc-gre, Ἡρακλῆς, , glory/fame of Hera), born Alcaeus (, ''Alkaios'') or Alcides (, ''Alkeidēs''), was a divine hero in Greek mythology, the son of Zeus and Alcmene, and the foster son of Amphitryon.By his adoptive descent through Amphitryon, Heracles receives the epithet Alcides, as "of the line of Alcaeus", father of Amphitryon. Amphitryon's own, mortal son was Iphicles. He was a great-grandson and half-brother (as they are both sired by the god Zeus) of Perseus, and similarly a half-brother of Dionysus. He was the greatest of the Greek heroes, the ancestor of royal clans who claimed to be Heracleidae (), and a champion of the Olympian order against chthonic monsters. In Rome and the modern West, he is known as Hercules, with whom the later Roman emperors, in particular Commodus and Maximian, often identified themselves. The Romans adopted the Greek version of his life and works essentially unchanged, but added anecdotal detail of their own, so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amphitryon
Amphitryon (; Ancient Greek: Ἀμφιτρύων, ''gen''.: Ἀμφιτρύωνος; usually interpreted as "harassing either side", Latin: Amphitruo), in Greek mythology, was a son of Alcaeus, king of Tiryns in Argolis. His mother was named either Astydameia, the daughter of Pelops and Hippodamia, or Laonome, daughter of Guneus, or else Hipponome, daughter of Menoeceus. Amphitryon was the brother of Anaxo (wife of Electryon), and Perimede (mythology), Perimede, wife of Licymnius. He was a husband of Alcmene, Electryon's daughter, and stepfather of the Greek hero Heracles.Roman, L., & Roman, M. (2010). Mythology Amphitryon, a Thebes, Greece, Theban general, was originally from Tiryns in the eastern part of the Peloponnese, and was a friend of Panopeus (mythology) , Panopeus. Having accidentally killed his father-in-law Electryon, king of Mycenae, Amphitryon was driven out by Electryon's brother, Sthenelus (son of Andromeda and Perseus), Sthenelus. He fled with Alcmene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philammon
In Greek mythology, Philammon (Ancient Greek: Φιλάμμων) was an excellent musician, a talent he received from his father Apollo. Family Philammon's mother was either Chione (or Philonis), daughter of Daedalion, or Leuconoe, daughter of Eosphoros. By Argiope, a nymph of Mount Parnassos, he had Thamyris. Mythology Philammon was unnaturally beautiful and thus, one of the nymphs (Argiope) seduced the youth and became pregnant. But Philammon refused to take her into his house as his wife and for being ashamed of the pregnancy, the girl left Peloponnese and came to the Akte (shore) where she gave birth to a boy, Thamyris. Philammon was said to have established the tradition of the hymns celebrating the births of Artemis and Apollo, written by himself, being performed by choruses of girls at Delphi. He was the second winner of the most ancient singing contest at Delphi, after Chrysothemis and before his son Thamyris. Some ascribe to him the foundation of the Lernaean mysteri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diamniotic
The amniotic sac, also called the bag of waters or the membranes, is the sac in which the embryo and later fetus develops in amniotes. It is a thin but tough transparent pair of membranes that hold a developing embryo (and later fetus) until shortly before birth. The inner of these membranes, the amnion, encloses the amniotic cavity, containing the amniotic fluid and the embryo. The outer membrane, the chorion, contains the amnion and is part of the placenta. On the outer side, the amniotic sac is connected to the yolk sac, the allantois, and via the umbilical cord, the placenta. The yolk sac, amnion, chorion, and allantois are the four extraembryonic membranes that lie outside of the embryo and are involved in providing nutrients and protection to the developing embryo. They form from the inner cell mass; the first to form is the yolk sac followed by the amnion which grows over the developing embryo. The amnion remains an important extraembryonic membrane throughout prenatal deve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monochorionic
Monochorionic twins are monozygotic (identical) twins that share the same placenta. If the placenta is shared by more than two twins (see multiple birth), these are monochorionic multiples. Monochorionic twins occur in 0.3% of all pregnancies. Seventy-five percent of monozygotic twin pregnancies are monochorionic; the remaining 25% are ''dichorionic diamniotic''. If the placenta divides, this takes place before the third day after fertilization. Amniocity and zygosity Monochorionic twins generally have two amniotic sacs (called Monochorionic-Diamniotic "MoDi"), but sometimes, in the case of monoamniotic twins (Monochorionic-Monoamniotic "MoMo"), they also share the same amniotic sac. Monoamniotic twins occur when the split takes place after the ninth day after fertilization. Monoamniotic twins are ''always'' monozygotic (identical twins).Pregnancy-Info -- > Monoamniotic TwinsRetrieved on July 9, 2009 Monochorionic-Diamniotic twins are ''almost always'' monozygotic, with a few ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autolycus
In Greek mythology, Autolycus (; Ancient Greek: Αὐτόλυκος ''Autolykos'' 'the wolf itself') was a successful robber who had even the power of metamorphosing both the stolen goods and himself. He had his residence on Mount Parnassus and was renowned among men for his cunning and oaths. Family There are a number of different accounts of the birth of Autolycus. According to most, he was the son of HermesPseudo-Apollodorus''Bibliotheca'' 1.9.16/ref> and ChioneHyginus, ''Fabulae'' 201 or Philonis. In Ovid's version, Autolycus was conceived after Hermes had intercourse with the virgin Chione. Pausanias instead states that Autolycus' real father was Daedalion. Pausanias, ''Graeciae Descriptio''br>8.4.6/ref> In some accounts, his mother was also called Telauge. Depending on the source, Autolycus was the husband of Mestra (who could change her shape at will and was a daughter of Erysichthon), or of Neaera, or of Amphithea. He became the father of Anticlea (who married Laerte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hermes
Hermes (; grc-gre, Ἑρμῆς) is an Olympian deity in ancient Greek religion and mythology. Hermes is considered the herald of the gods. He is also considered the protector of human heralds, travellers, thieves, merchants, and orators. He is able to move quickly and freely between the worlds of the mortal and the divine, aided by his winged sandals. Hermes plays the role of the psychopomp or "soul guide"—a conductor of souls into the afterlife. In myth, Hermes functions as the emissary and messenger of the gods, and is often presented as the son of Zeus and Maia, the Pleiad. Hermes is regarded as "the divine trickster," about which the '' Homeric Hymn to Hermes'' offers the most well-known account. His attributes and symbols include the herma, the rooster, the tortoise, satchel or pouch, talaria (winged sandals), and winged helmet or simple petasos, as well as the palm tree, goat, the number four, several kinds of fish, and incense. However, his main symbol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
