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I. Correlation between Morphologic and Clinical Findings with Special Reference to Vascularization

The superficial digital flexor muscle is succeded by its tendon, passing through the carpal canal, where it is enveloped by the carpal tendon sheath. The distal reflection of the carpal synovial sheath is about 6 ern below the carpal joint. The tendon gradually flattens and is surrounded by a thin paratenon covered only by skin. About 4 em above the meta-carpo phalangeal joint the tendon is enveloped by the digital synovial sheath. At this point the SFT forms a sleeve around the deep flexor tendon. The SFT inserts at the distal end of first phalanx and at the proximal end of second phalanx. The tendon unit, the fibre, consists of bundles of collagen fibrils lying between rows of tendon cells and encircled by their processes. These primary bundles are aggregated into larger bundles, tendon bundles (HAM 1969). Epitenon is a thin layer connective tissue which covers the tendon. It continues into the tendon as the endotenon, which separates tendon bundles and carries vessels, lymphatics and nerves. The tendon is surrounded by a layer of loose connective tissue, the paratenon. Where the tendon is exposed to increased friction or changes direction it is enveloped by a tendon sheath. The sheath consists of visceral and parietal layers forming a mesotenon and containing a synovia-like fluid (NISBET 1960, ELLIOTT 1965). The SFT is well accessable to palpation. The clinical signs of SFT lesions are well known. Degree of lameness may vary considerably. Usually there is a more or less evident fusiform swelling localized to the mid portion of the tendon. The swelling is usually painful on palpation and there is a more or less distinct rise in temperature over the site of lesion. Onset of clinical signs is usually sudden. Slight signs usually disappear within a few days, while severe signs persist for a long period of time.