Form and function of the oblique cord (chorda obliqua) in anthropoid primates

Primates; Journal of Primatology
Biren A Patel

Abstract

The oblique cord of the forearm in humans is a ligament connecting the anterolateral aspect of the ulna proximally to the posteromedial aspect of the radius distally, inserting just below the radial tuberosity. Its functional significance is uncertain, but it has been proposed that the ligament limits supination of the forearm or aids in resisting buckling failure in the curved radius. These functional explanations are unsatisfactory for bipedal humans who do not use their forelimbs in weight support. Furthermore, there are no evolutionary explanations for its presence in humans. The purpose of this study was to investigate the distribution and form of the oblique cord in non-human primates and to explore its possible functional significance and evolutionary origin in humans. Soft tissue dissections of anthropoid primates revealed the presence of an oblique cord in New and Old World monkeys and Asian apes. It was absent in all atelines. Passive manipulation of the two forearm bones in all specimens revealed that the ligament becomes most taut in pronation contrary to the proposed human condition. Isolated radii show that the oblique cord's radial insertion lacks a clear relationship with bone curvature, thus providing little su...Continue Reading

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Feb 13, 2009·The Journal of Hand Surgery·Kazuo NodaHisao Moritomo
Sep 13, 2008·American Journal of Physical Anthropology·Ignasi GaltésAssumpció Malgosa
May 10, 2006·Clinical Anatomy : Official Journal of the American Association of Clinical Anatomists & the British Association of Clinical Anatomists·R Shane TubbsW Jerry Oakes
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Jun 9, 2020·Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft·Susanne ReinHubertus Philipps

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