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J Hand Surg Am. 1990 Jul;15(4):595-602.

Anatomy of the juncturae tendinum of the hand.

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Division of Orthopaedic Surgery, University of California, San Diego, School of Medicine.


Three distinct morphologic types of juncturae tendinum of the extensor tendons were identified in the dissection of 40 cadaver hands. Type 1 juncturae consists of filamentous regions within the intertendinous fascia that attached to the extensor tendons on either side of the intermetacarpal space in a transverse or oblique direction. The second type, consists of much thicker and well-defined connecting bands. Type 3 juncturae consist of tendon slips from the extensor tendons and were subclassified into "y" or "r" subtypes depending on shape. Type 1 juncturae were present in 88% of the second intermetacarpal spaces and in 28% of the third intermetacarpal spaces. Type 2 juncturae were present in 40% of the third intermetacarpal spaces and in 23% of the fourth intermetacarpal spaces. Type 3 juncturae were present in 33% of the third intermetacarpal spaces and in 80% of the fourth intermetacarpal spaces. Juncturae were absent in all of the first intermetacarpal spaces and in 12% of the second intermetacarpal spaces; they were present in all other spaces. The extensor indicis proprius did not receive a junctural connection, whereas extensor digiti quinti tendons did receive junctural connections. Intertendinous fascia was present between all extensor digitorum communis tendons regardless of presence of juncturae.

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