• H P von Schroeder, M J Botte, and H Gellman.
• Division of Orthopaedic Surgery, University of California, San Diego, School of Medicine.
• J Hand Surg Am. 1990 Jul 1; 15 (4): 595-602.

AbstractThree 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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