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Meckel’s cartilage

Noun, pl. Meckel’s cartilages Also known as Meckelian’s cartilages. 1. The cartilaginous bar of the embryonic mandibular arch of which the distal end ossifies to form the malleus and most of the rest disappears in development, with the part adjacent to the malleus being replaced by fibrous membrane comprising the sphenomandibular ligament and the connective tissue covering most of the remaining part ossifying to form much of the mandible. ( 2. Hyaline cartilage formed in the mandibular process of the first branchial arch of vertebrate embryos. ( 3. The bilaterally paired, rod-like, cartilaginous ventral component of the lower jaw, or ventral mandibular arch. It is typically resorbed in adults. ( Syn: ventral mandibular cartilage Word origin: Named after Johann Friedrich Meckel (1781-1833), German...

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Meckel’s diverticulum

Noun 1. A true congenital diverticulum which is a slight bulge in the small intestine present at birth and a vestigial remnant of the omphalomesenteric duct (also called the vitelline duct or yolk stalk). It is the most common malformation of the gastrointestinal tract is present in approximately 2% of the population, with males more frequently experiencing symptoms. ( 2. The proximal part of the omphalomesenteric duct when persistent as a blind fibrous tube connected with the lower ileum. ( 3. A congenital diverticulum in the ileum resulting from incomplete closure of the yolk sac. ( 4. A pouch on the wall of the lower part of the intestine that is present at birth (congenital). The diverticulum may contain tissue that is the same as tissue of the stomach or pancreas. ( Word origin: From Latin deverticulum “a bypath,” from devertere “to turn...

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