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The flexor tendons cross the wrist, in a large compartment beneath the anterior annular ligament, the outermost being that for the flexor longus pollicis which passes outward along the thumb, 1899. From 'The Treatise of the Human Anatomy and Its Applications to the Practice of Medicine and Surgery, Volume I' (1899). The fibrous sheaths of the flexor tendons are subcutaneous. Upon either side of these sheaths are the collateral digital vessels and nerves. The sheaths are attached to the sharp lateral margins of the anterior surface of the phalanges, and thus form an osteo-fibrous canal, which is composed of the bone behind and fibrous tissue in front. The thecae, or synovial saca, of the index, middle, and ring fingers extend from the heads of the metacarpal bones to the middle of the distal phalanges, and do not communicate with the carpal bursae, while those of the thumb and little finger do. (Photo by VintageMedStock/Getty Images)