Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Trapezoid bone
open-in-new
<p>The trapezoid bone (lesser multangular bone) is a <a href="/facts/Carpal_bones/DjpaAuNd">carpal bone</a> in <a href="/facts/Tetrapod/vWpAxzAW">tetrapods</a>, including <a href="/facts/Humans/rlcTENsr">humans</a>. It is the smallest bone in the distal row of carpal bones that give structure to the palm of the hand. It may be known by its <a href="/facts/Wedge_(mechanical_device)/Wohjlsa2">wedge</a>-shaped form, the broad end of the wedge constituting the <a href="/facts/Dorsal_surface/IpJ1fq2f">dorsal</a>, the narrow end the palmar surface; and by its having four articular facets touching each other, and separated by sharp edges. It is <a href="/facts/Homology_(biology)/muctKlyT">homologous</a> with the "second distal carpal" of reptiles and amphibians. </p>