Oblique cord (chorda obliqua) of the forearm and muscle-associated fibrous tissues at and around the elbow joint: a study of human foetal specimens

• Autorzy: Jin Z.W. , Jin Y. , Yamamoto M. , Abe H. , Murakami G. , Yan T.F.
• Języki publikacji: EN

Abstrakty

EN

In adults, the oblique cord or chorda obliqua separates the origins of the flexor pollicis longus (FPL) and flexor digitorum profundus (FDP) muscles from the supinator muscle and elbow joint. This study examined the topographic anatomy of the oblique cord and related muscles in foetuses. Semiserial sections of five mid-term foetuses of gestational age (GA) 14–16 weeks and 12 late-stage foetuses of GA 28–30 weeks were histologically examined and three forearms at GA 30 weeks were macroscopically evaluated. Late-stage foetuses showed a fascial structure between the supinator and FDP muscles. The latter extended proximally to the elbow joint and the muscle origin thickened the distal, ulnar part of the capsule. The FPL origin also extended proximally but did not reach the joint capsule. These morphologies were consistent with macroscopic examinations. The brachialis muscle was widely inserted into the proximal, anterior part of the capsule. In addition, the medial collateral ligament was not covered by the pronator-flexor muscles but by the triceps brachii muscle. The oblique cord apparently did not form prenatally. After birth, the proximal parts of the FDP and FPL muscles were likely replaced by collagenous tissues, providing a specific type of intermuscular septum i.e., the oblique cord. This type of muscle-ligament transition was observed in the annular ligament of the radius. The foetal elbow joint was characterised by strong support by the FDP, brachialis and triceps brachii muscles. Therefore, the foetal elbow is not a miniature version of the adult elbow. (Folia Morphol 2016; 75, 4: 493–502)

• Wydawca: -
• Czasopismo: Folia Morphologica
• Rocznik: 2016
• Tom: 75
• Numer: 4
• Opis fizyczny: p.493-502,fig.,ref.

Twórcy

autor

Jin Z.W.

• Department of Anatomy, Histology and Embryology, Yanbian University Medical College, Yanbian, China

autor

Jin Y.

• Department of Anatomy, Histology and Embryology, Yanbian University Medical College, Yanbian, China

autor

Yamamoto M.

• Department of Anatomy, Tokyo Dental College, Tokyo, Japan

autor

Abe H.

• Department of Anatomy, Akita University Graduate School of Medicine, Akita, Japan

autor

Murakami G.

• Division of Internal Medicine, Iwamizawa Kojin-kai Hospital, Iwamizawa, Japan

autor

Yan T.F.

• Division of Gynaecology and Obstetrics, Baishan Central Hospital, Baishan, China

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Identyfikatory

DOI

10.5603/FM.a2016.0019