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Craniopagus twins are conjoined twins who are fused at the cranium. [1] The union may occur on any portion of the cranium, but does not primarily involve either the face or the foramen magnum; the two brains are usually separate, but they may share some brain tissue. Conjoined twins are genetically identical and always share the same sex. [2]
Skeletal structure of dicephalic twins. B. C. Hirst & G. A. Piersol, Human monstrosities. Wellcome L0027955. (1893) Dicephalic parapagus (/ d aɪ ˈ s ɛ f ə l ɪ k /) is a rare form of partial twinning with two heads side by side on one torso. [1] Infants conjoined this way are sometimes called "two-headed babies" in popular media. [2]
Tetrapod legs evolved in the Devonian or Carboniferous geological period from the pectoral fins and pelvic fins of their crossopterygian fish ancestors. Fish fins develop along a "fin line", which runs from the back of the head along the midline of the back, round the end of the tail, and forwards along the underside of the tail, and at the cloaca splits into left and right fin lines which run ...
These twins have four arms; one, two, three or four legs; and typically one set of external genitalia and one anus. [13] Survival rate is 63%. [14] Omphalo-Ischiopagus: Fused in a similar fashion to ischiopagus twins, but facing each other, with a joined abdomen, akin to omphalopagus. These twins have four arms, and two, three, or four legs. [13]
The human twin birth rate in the United States rose 76% from 1980 through 2009, from 9.4 to 16.7 twin sets (18.8 to 33.3 twins) per 1,000 births. [5] The Yoruba people have the highest rate of twinning in the world, at 45–50 twin sets (90–100 twins) per 1,000 live births, [6] [7] [8] possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may ...
The conjoined twins usually have four arms; two, three or four legs; and typically one external genitalia and anus. [1] It is mostly confused with pygopagus where the twins are joined dorsally at the buttocks facing away from each other, whereas ischiopagus twins are joined ventrally and caudally at the sacrum and coccyx. Parapagus is also ...
After identical twin sisters from Delaware married identical twin brothers from Tennessee, the children they are raising together share in a rare biological phenomenon. When identical twin sisters ...
The twin reversed arterial perfusion, or T.R.A.P. sequence, results in an 'acardiac twin', a parasitic twin that fails to develop a head, arms and a heart.The parasitic twin, little more than a torso with or without legs, receives its blood supply from the host twin by means of an umbilical cord-like structure, much like a fetus in fetu, except the acardiac twin is outside the autosite's body.