[The ultrastructure of ganglia and newly formed tendon sheaths]

Comparative electron microscopic examination of ganglions (from the tendon sheaths and joint capsules of the hand) as well as that of newly formed tendon sheaths (after resection of digital flexors and their tendon sheaths) indicate that both are the result of an adaptive effect of the mesenchyma which enables the formation of a new synovial organ in the presence of an adequate stimulus.