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ulna

[uhl-nuh] /ˈʌl nə/
noun, plural ulnae
[uhl-nee] /ˈʌl ni/ (Show IPA),
ulnas.
1.
Anatomy. the bone of the forearm on the side opposite to the thumb.
Compare radius (def 7).
2.
a corresponding bone in the forelimb of other vertebrates.
Origin
1835-1845
1835-45; < Latin: elbow; akin to Greek ōlénē, Old English eln ell2
Related forms
ulnar, adjective
postulnar, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for ulnar
  • It's a popular moniker of cubital tunnel syndrome-neuritis, or inflammation of the ulnar nerve.
  • ulnar translocation of the carpus is a form of wrist instability where the small bones of the wrist shift out of position.
British Dictionary definitions for ulnar

ulna

/ˈʌlnə/
noun (pl) -nae (-niː), -nas
1.
the inner and longer of the two bones of the human forearm
2.
the corresponding bone in other vertebrates
Derived Forms
ulnar, adjective
Word Origin
C16: from Latin: elbow, ell1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ulnar

ulna

n.

inner bone of the forearm, 1540s, Latin, literally "elbow;" related to Old English eln (see elbow (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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ulnar in Medicine

ulna ul·na (ŭl'nə)
n. pl. ul·nas or ul·nae (-nē)
The larger bone of the two bones of the forearm, extending from elbow to wrist on the side opposite the thumb. Also called cubitus, elbow bone.


ul'nar adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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ulnar in Science
ulna
  (ŭl'nə)   
Plural ulnas or ulnae (ŭl'nē)
The longer of the two bones of the forearm or lower portion of the foreleg. See more at skeleton.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for ulnar

ulna

inner of two bones of the forearm when viewed with the palm facing forward. (The other, shorter bone of the forearm is the radius.) The upper end of the ulna presents a large C-shaped notch-the semilunar, or trochlear, notch-which articulates with the trochlea of the humerus (upper arm bone) to form the elbow joint. The projection that forms the upper border of this notch is called the olecranon process; it articulates behind the humerus in the olecranon fossa and may be felt as the point of the elbow. The projection that forms the lower border of the trochlear notch, the coronoid process, enters the coronoid fossa of the humerus when the elbow is flexed. On the outer side is the radial notch, which articulates with the head of the radius. The head of the bone is elsewhere roughened for muscle attachment. The shaft is triangular in cross section; an interosseous ridge extends its length and provides attachment for the interosseous membrane connecting the ulna and the radius. The lower end of the bone presents a small cylindrical head that articulates with the radius at the side and the wrist bones below. Also at the lower end is a styloid process, medially, that articulates with a disk between it and the cuneiform (os triquetrum) wrist bone.

Learn more about ulna with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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