Lundborg G, Myrhage R
Scand J Plast Reconstr Surg. 1977;11(3):195-203. doi: 10.3109/02844317709025518.
The gliding surfaces of the flexor tendons and the tendon sheath are delicate structures of the complex digital flexor system. Beside the fibrous parts, the tendon sheath also exhibits membranous synovial components, which represent a dialysing membrane producing a plasma ultrafiltrate--the synovial fluid. In this study, interest was focused on the vascularization of the synovial sheath. By a microangiographic method it was demonstrated that this membrane is richly vascularized and that the vascular plexus is in continuity on the outside of the fibrous pulleys. The friction surfaces of the system--the inside of the pulleys and the surface of the flexor tendons--are devoid of vessels, and here a differentiation into chondrocyte-like cells is observed. It is suggested that these tissue areas, in analogy to joint cartilage, are nourished by diffusion from the synovial fluid, and that the flexor system can be regarded as a specialized joint, sliding longitudinally and exhibiting an extremely large range of motion.
屈肌腱和腱鞘的滑动面是复杂指屈肌系统的精细结构。除了纤维部分，腱鞘还具有膜性滑膜成分，其代表产生血浆超滤液——滑液的透析膜。在本研究中，重点关注滑膜鞘的血管化。通过微血管造影方法证明，该膜血管丰富，血管丛在纤维滑车外部连续。该系统的摩擦面——滑车内部和屈肌腱表面——没有血管，在此观察到向软骨样细胞的分化。有人提出，与关节软骨类似，这些组织区域通过滑液扩散获得营养，并且屈肌系统可被视为一个专门的关节，纵向滑动并表现出极大的运动范围。
