transposition

transposition /trans·po·si·tion/ (trans?po-zish´un)

1. displacement of a viscus to the opposite side.

2. the operation of carrying a tissue flap from one situation to another without severing its connection entirely until it is united at its new location.

3. the exchange of position of two atoms within a molecule.

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transposition of great vessels  a congenital cardiovascular malformation in which the position of the chief blood vessels of the heart is reversed. Life then depends on a crossflow of blood between the right and left sides of the heart, as through a ventricular septal defect.

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trans·po·si·tion (trnsp-zshn)

n.

1. Removal from one place to another.

2. The state of being transposed or of being on the wrong side of the body.

3. Transfer of a segment of DNA to a new position on the same or another chromosome, plasmid, or cell.

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transposition

displacement to the opposite side; in genetics, the nonreciprocal insertion of material deleted from one chromosome into another, nonhomologous chromosome.

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transposition of arterial trunks

see transposition of great vessels (below).

transposition of great vessels

a congenital heart defect, in which the position of the chief blood vessels of the heart is reversed. Called also transposition of arterial trunks.

ulnar styloid transposition

a surgical procedure for correction of growth deformity resulting from premature closure of the distal ulnar physis. The distal tip of the ulna is fused to the distal radial epiphysis.

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transposition Pediatrics A malposition of an organ or tissues that occurs during embryogenesis Psychiatry See Gender identity transposition Surgery Plastic surgery in which a flap of tissue is moved from one site to another and allowed sufficient time to establish a new blood supply before severing the vascular connection with the donor site. See Sensory nerve transposition.