08/14/2026
Absolute Brilliance or Absolute Blechschmidt.
I am neither a histology expert, a cytology expert, nor an embryology expert. However, I am a curious manual therapist. During the last quarter of a century, I have been studying how best to implement information received from the body. After much time and even more reflection, I find the questions I ask myself get bigger and bigger. I have always believed embryology plays a significant role in the corpus of manual therapy. As such, I considered:
Do the cellular fluids of the body demonstrate Intelligence?
In consideration of this question, we have to go back to the onset of development: the embryo. In "The Ontogenetic Basis of Human Anatomy," Erich Blechschmidt maps the kinetic, metabolic, and biomechanical principles of human development. Blechschmidt introduces the idea of biodynamics. In his work, Blechschmidt uses human embryos for his research as opposed to the more commonly derived physiological explanations using animal models.
We must also be clear about use of the term "intelligence." Intelligence is defined as the mental power to learn, understand, reason, solve problems, and adapt to new situations. We can make the case that fluid movement solves the problem of boundaries. We can also make the case that fluid dynamics adapts to new situations. Is this intelligence? Not by definition. It is more akin to the intelligence of a river in carving through a valley.
Erich Blechschmidt:
Erich Blechschmidt (1904-1992) was a German embryologist who built a collection of human embryo models. Housed at the University of Gottingen in Germany, the collection contains hundreds of human embryos and fetuses. The collection also possesses unique life-size models of human embryos. The contents of Blechschmidt's research and physical representations of his work are globally unique.
Blechschmidt's concept of biodynamic forces is primarily based around fluid movement, metabolic shifts, and developing pressures. In his work on biokinetics in differentiation, he demonstrated that genetic activity reacts to physical and hydrodynamic environments. He discovered that protoplasmic movement within the early embryo facilitated spatial organization and anatomical form.
Blechschmidt categorized the developmental stages into metabolic fields where differing growth rates alter local tissue tension. Consequently, cellular differentiation and tissue folding respond directly to physical forces like hydrostatic pressure. Blechschmidt believed that growth functions precede all higher functions, arguing that genes are themselves inert and thus react to the stimuli coming from the cytoplasm.
There are eight metabolic fields described by Blechschmidt to explain how cells, tissues, and organs change shape and position during development. For example,
- Suction fields create glands
- Densation and detraction fields create bones
- Distusion fields create cartilage
- Retention fields create tendons, ligaments and joint capsules
- Dilation fields create muscle fibres
Blechschmidt found that blood vessels act as restraining structures. This means that they act as mechanical barriers constraining and shaping differential tissue during development. In a broader context, blood vessels provide resistance that direct organ flow, slow excessive cellular proliferation in adjacent tissues, and guide spatial folding. This vascular border dictates where tissues either bend or expand.
Blechschmidt found that all organic differentiation is a development of position, form, structure, and function. For example,
wherever cells lie close together, extended perpendicular towards a free surface, they exert a mutual pressure in a lateral direction
organs differentiate whenever there exists both a spatial opportunity and a metabolic occasion
the suction field created by the growing/descending heart, liver, and vertebral column allows for the development of the lung
Metabolic fields and manual therapy:
Beginning at conception, our developmental journey to birth and beyond is a constant physiological flux. This biokinetic evolution shows that the embryo develops in continuous motion and that physical forces shape cellular differentiation. Cells respond to physical force. Although poorly understood, we know this through our manual therapy work. However, we can explore this relationship if we can ascertain where we need to provide a "metabolic force."
Outside-inside differentiation proves that outside mechanical forces from surrounding tissues dictate internal structural development. The aim of the practitioner is not development. The body knows this. It has long since moved on from development and is now working towards optimizing metabolism and health. There is a plan. We must work with this plan using our tool of choice: our hands. We provide the necessary outside mechanical forces of support.
"Find it, fix it, leave it alone" - A. T. Still
The key is in understanding how to communicate with this biodynamic force; interaction can occur from anywhere. The body is always in optimization to some capacity. There are priorities. The majority of the body is doing just fine. We simplify treatment to the most important and appropriate applications of the metabolic fields with which the body can create the desired result. Understanding this is a long journey. We facilitate the conditions for change.
In Closing:
We began life through changes in internal fluid movements and physical forces. These are intrinsic and vital forces for embryological development. These origins are instrumental in our applications of manual therapy. We can facilitate change with mechanical force. We have to ask how we can facilitate the best change for that person on that day. The body is already working on it. We are lending a hand... or two.