This video series by Dr. Jean Claude Guimbertau demonstrates the sliding surfaces of tendons and their sheaths, skin, muscle, blood vessels during movement of the human body. While I am not familiar with Jennings, he originally posted one of these videos. A very interesting look into the human body!
Have a look at Dr. Jean Claude Guimberteau’s web site here. The videos are available for purchase at Terra Rosa here.
Stay Tuned Therapeutics 