Reading John 3 this morning, an issue of modern science came up, concerning this other world, which parallel and very rarely touching, may only be a fraction of an atom away. He says, I know what I am talking about, but you do not believe me, concerning the need to be born once again, spiritually, to be able to participate and play a role in this other world. This conversation was 2000 years ago.
In this world science or ways of knowing have not advance much further. Albrecht in "Meilensteine auf dem Weg zur Hohen Schule" speaks of the points of contacts, the horse needs to progress in the movements of the Haute Ecole. He mentions the rider's seat bones, the inside of his seat, the seat muscles and the Steißbein (these a the rest of what in four-legged mammals constitutes the tail). He does not speak of the rider's legs and feet, which quite evidently may play a role as well.
Looking it up in my Thieme, I once again notice that the inside of the seat is innervated by the nerves of the dermatome S3; this dermatome continues down the inside of the legs to the anckles. The seat bones, however, are right in the center of S2; this dermatome running down the rear of the leg to the heel and proceeding along the bottom of the foot to the big toe.
Albrecht mentions the Steißbein and the seat muscles, which both seem to be one step removed. Both hold no immediate contact to the horse's skin. No function can be attributed to them directly. As it stands, in the horse nerve sections S2/3 are located right in the sacral joint (by the way, who gave this joint this name, and why?). Maybe equitation works with corresponding frequences via the skin. In mammals skin and core are united via the innervations of the skin. Why should not this same system serve the unity of man and the horse?
Missing in this presentation, but mentioned elsewhere in Albrecht's text is the role of the rider's torso. Come to think of it. A study of the first lumbar vertebra and the corresponding dermatome might be worthwhile. There is more than one detail to be mentioned here. Facts relevant to human motion and to equitation. Fact is, the dermatome L1 proceeds from the first lumbar vertebra mid-back out and downwards, wraps around the hips and gets in touch with S2 in the loins. With that very skin region S2 that covers the seat bones and proceeds down to the heel and the big toe. I bet this means something to riders who do Piaffe and Passage. They keep the horse's hindquarters (which extend from the first lumbar vertebra to the tip of the hind hoofs and are innervated accordingly) well together just with the seat in which L1 and S2/3 meet.
How does the human function in the other world and how in this world. The reader may realise why I would like to inspect and visualise these aspects of the human and equitation in 3D.