| internal branch of accessory nerve | <anatomy, nerve> Branch of the accessory nerve trunk which carries fibres from the cranial root and which unites with the vagus nerve in the jugular foramen. See: accessory nerve. Synonym: ramus internus nervi accessorii, internal ramus of accessory nerve. (05 Mar 2000) |
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| internal ramus of accessory nerve | <anatomy, nerve> Branch of the accessory nerve trunk which carries fibres from the cranial root and which unites with the vagus nerve in the jugular foramen. See: accessory nerve. Synonym: ramus internus nervi accessorii, internal ramus of accessory nerve. (05 Mar 2000) |
| external branch of accessory nerve | <anatomy, nerve> Portion of the accessory nerve trunk which exits independently from the jugular foramen, carrying fibres from the spinal root of the accessory nerve to the sternocleidomastoid and trapezius muscle. (05 Mar 2000) |
| adherent placenta | A placenta that fails to separate cleanly from the uterus after delivery. (05 Mar 2000) |
| annular placenta | A placenta in the form of a band encircling the interior of the uterus. Synonym: zonary placenta. (05 Mar 2000) |
| battledore placenta | A placenta in which the umbilical cord is attached at the border; so-called because of the fancied resemblance to the racquet (racket) used in battledore, a precursor to badminton. (05 Mar 2000) |
| bidiscoidal placenta | A placenta with two separate disc-shaped portions attached to opposite walls of the uterus, normal for certain monkeys and shrews, and occasionally found in humans. (05 Mar 2000) |
| margination of placenta | See: placenta marginata. (05 Mar 2000) |
| maternal placenta | <anatomy> The part of the placenta derived from the uterine tissue. See: placenta. Synonym: maternal placenta, placenta uterina. (05 Mar 2000) |
| villous placenta | A placenta in which the chorion forms villi. (05 Mar 2000) |
| central placenta previa | Placenta previa in which the placenta entirely covers the internal os of the cervix. Synonym: central placenta previa, total placenta previa. (05 Mar 2000) |
| retained placenta | Incomplete separation of the placenta and its failure to be expelled at the usual time after delivery of the child. Synonym: incarcerated placenta. (05 Mar 2000) |
| chorioallantoic placenta | A placenta (such as that of primates) in which the chorion is formed by the fusion of the allantoic mesoderm and vessels to the inner face of the serosa. (05 Mar 2000) |
| chorioamnionic placenta | A form of placentation in which the amnion is fused to the inside of the chorion, thus permitting interchange of water and electrolytes between mother and foetus. (05 Mar 2000) |
| choriovitelline placenta | A placenta (seen in some lower animals) in which the chorion is formed by the fusion of yolk-sac mesoderm and vessels to the inner face of the serosa. (05 Mar 2000) |