Duodenum: The first part of the small intestine. The duodenum is a common site for peptic ulcer formation.
Duplication: Part of a chromosome in duplicate, a particular kind of mutation (change) involving the production of one or more copies of any piece of DNA, including a gene or even an entire chromosome. Duplications typically arise from an event termed unequal crossing-over (a kind of recombination) that occurs between misaligned homologous chromosomes during meiosis […]
- Dupuytren contracture
A localized formation of scar tissue in the palm of the hand within a tissue (fascia) beneath the skin of the palm that normally covers the tendons that pull the fingers into a grip. As Dupuytren’s contracture progresses, more of the fascia becomes thickened and shortened. Dimpling and puckering of the skin over the area […]
Dura: The outermost, toughest, and most fibrous of the three membranes (meninges) covering the brain and the spinal cord. Dura is short for dura mater (from the Latin for hard mother). Also called the pachymeninx (singular) or pachymeniges (plural). Epidural means outside the dura. An accumulation of blood outside the dura is an epidural hematoma. […]
- Dupuytren, Guillaume
Dupuytren, Guillaume: (1777-1835) The leading French surgeon of the early part of the 19th century. Dupuytren reported the condition in 1832 that now bears his name: Dupuytren contracture. He was not the first to describe the condition but he was the first to recognize that this form of finger contracture was due to scarring of […]
- Dura mater
Dura mater: The outermost and most fibrous of the three membranes (dura mater, arachnoid membrane, and pia mater) covering the brain and the spinal cord.