Oblique cord

Oblique cord
Oblique cord
Left elbow-joint, showing anterior and ulnar collateral ligaments. (Oblique cord visible as diagonal white line near center bottom.)
The Supinator. (Oblique cord visible at center.)
Latin chorda obliqua membranae interosseae antebrachii
Gray's subject #85 325

The oblique cord is a ligament between the two ulnar and radius bones in the lower arm near its elbow. It takes the form of a small, flattened band, extending downward and lateralward, from the lateral side of the ulnar tuberosity at the base of the coronoid process to the radius a little below the radial tuberosity.[1] Its fibers run in the opposite direction to those of the Interosseous membrane of the forearm.[1]

It is called by other names including oblique ligament, chorda obliqua, radio-ulnar ligament, chorda oblique antebrachii anterior, proximal interosseous band, dorsal oblique accessory cord, proximal band of the interosseous membrane, superior oblique ligament, oblique ligament proper, round ligament, and ligament of Weitbrecht.[2]

It has no known function and can be cut without apparent consequence.[2]



A study upon the arms of 38 people found that its mean length is 3.4 cm (range 2.4 to 4.2 cm) and in most people it tapers from the ulna to the radius end, being at the ulna 9 mm, in its middle, 7mm and its radius end 4 mm.[2]


It has been suggested to strengthen the interosseus membrane proximally,[1] provide restraint for the rotatory movements of the forearm,[3] or that the ligament may stop bone bending and preventing buckling failure.[3] However, due the orientation of its fibers, the oblique cord is unlikely to transfer force due to limb loading from the radius to the ulna.[4]

One recent comparative study upon primates concluded:

The oblique cord does not limit supination, nor does it seem to have a role in preventing radial buckling failure or reducing bending strain. What, then, is the oblique cord for? The oblique cord may simply be an additional tie between the radius and ulna aiding other soft tissue structures such as the annular ligament and interosseous membrane. Additionally, the oblique cord may prevent anterior shearing of the proximal radius under extreme compressive loads.[4]

A study on humans concluded that it "appears insignificant in stability of the proximal forearm."[2] It has been suggested that its presence in modern humans may be a vestigial body part for a biped that was important due to the load-bearing function of the upper limb in evolutionarily earlier quadruped human ancestors.[4]


The shape and form of the ligament have been found in humans cadavers to vary from a rounded cord to a flat membrane.[3] Further, it is not found in all humans being variably found to be absent in half of arms,[2] and a third[3] or 15% of people.[5] It is found in most primates though not in the family of New World monkeys that includes spider and woolly monkeys called atelines.[4]


  1. ^ a b c Platzer, Werner (2004). Color Atlas of Human Anatomy, Vol. 1: Locomotor System. p 122 (5th ed.). Thieme. ISBN 3-13-533305-1. 
  2. ^ a b c d e Tubbs RS, O'Neil JT Jr, Key CD, Zarzour JG, Fulghum SB, Kim EJ, Lyerly MJ, Shoja MM, George Salter E, Jerry Oakes W. (2007). The oblique cord of the forearm in man. Clin Anat. 20(4):411–5. PMID 16683244
  3. ^ a b c d Martin BF.(1958). The oblique cord of the forearm. J Anat. 92(4):609–15. PMID 13587394
  4. ^ a b c d Patel BA. (2005). Form and function of the oblique cord (chorda obliqua) in anthropoid primates.Primates. 46(1):47–57. PMID 15241636
  5. ^ Skahen JR 3rd, Palmer AK, Werner FW, Fortino MD. (1997). The interosseous membrane of the forearm: anatomy and function. J Hand Surg Am. 22(6):981–5.PMID 9471064

External links

Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • oblique cord of elbow joint — chorda obliqua membranae interosseae antebrachii …   Medical dictionary

  • Oblique — may refer to: Oblique angle, in geometry, an angle that is not a multiple of 90 degrees Oblique angle, synonym for Dutch angle, a cinematographic technique Oblique (album), by jazz vibraphonist Bobby Hutcherson Oblique banded rattail, a fish also …   Wikipedia

  • Cord — Short and informal reference to the spinal cord, the major column of nerve tissue that is connected to the brain, lies within the vertebral canal, and from which the spinal nerves emerge. The spinal cord and the brain constitute the central… …   Medical dictionary

  • Spermatic cord — Infobox Anatomy Name = PAGENAME Latin = funiculus spermaticus GraySubject = 258 GrayPage = 1239 Caption = Anatomy of the human male reproductive system Caption2 = The spermatic cord in the inguinal canal. (Label for spermatic cord in lower… …   Wikipedia

  • Ligament — A ligament is a tough band of connective tissue that connects various structures such as two bones. Ligament is a fitting term; it comes from the Latin ligare meaning to bind or tie. * * * 1. A band or sheet of fibrous tissue connecting two or… …   Medical dictionary

  • chorda — A tendinous or a cord like structure. SEE ALSO: cord. [L., cord] c. arteriae umbilicalis [TA] SYN: cord of umbilical artery. c. chirurgicalis surgical catgut. [L.] c. dorsalis SYN: notochord (2). false chordae tendineae …   Medical dictionary

  • Ligament — Diagram of the right knee. Typical joint In …   Wikipedia

  • Joint — For other uses, see Joint (disambiguation). Typical Joint A joint is the location at which two or more bones make contact.[1] They are constructed to allow movement and provide mechanical support, and are classified structurally and functionally …   Wikipedia

  • Interphalangeal articulations of hand — Interphalangeal joints Human hand bones …   Wikipedia

  • Bursa — A bursa is a closed fluid filled sac that functions to provide a gliding surface to reduce friction between tissues of the body. When the bursa becomes inflamed, the condition is known as "bursitis." Most commonly this is not an… …   Medical dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”