Abstract
1. Certain macroscopical and microscopical features of the tendo calcaneus of the rabbit are described and illustrated, and the vascularisation as revealed by Spalteholz clearing is presented.
2. The vessels of the epitenon are chiefly derived from proximal and distal sources.
3. The vessels of the paratenon are derived from the main arteries of the leg.
4. The two vascular systems are largely independent of each other except along one edge of the tendon by way of a mesotenon.
5. The paratenon, epitenon and mesotenon and the related vessels are comparable to those found in tendons with synovial sheaths. By inference and from evidence obtained by dissection on the living human subject it is suggested that the arrangements are similar in the human tendo calcaneus.
6. Considerable friction develops on movement between the surfaces of the paratenon and epitenon. This might be significant in pathological states of the human tendon.
