Ming Men

I am not entirely sure I understand what you are looking for with your question but my sense is that looking at the Ming Men as a function instead of a location may cause some confusion. My understanding is that the Ming Men is simply an area where, due to channel confluences, a person may be strengthened or weakened. If you eat well, exercise, balance your emotions, etc. your qi should flow smoothly and as it is "stored" in the dantien/mingmen area it is more available to manage disruptions, balance health, and for martial arts and spiritual pursuits. The ming men to me is just this location and not a function that can be strengthened per se. Rather it is the concept behind the area where various channels cross and store energy naturally.

In my mind, every aspect of the body can be strengthened with the building and conservation of post-natal qi. And this, as you point out, is the role of qi gong and a multitude of other practices, habits, and techniques. In general terms the more you do not overuse the qi you create and maintain from proper lifestyle, exercise, etc. the less you "tap" into the pre-natal qi (or jing, or essence). Just like weight loss eventually comes down to the calories in vs. calories out equation - long term health comes to the post-natal qi development and stored vs. post-natal qi used equation. When you overstep the boundary (through illness, poor diet, etc.) you tap into the pre-natal qi and, technically, shorten your lifespan.

With regards to the nature of the ming men, I believe this area comes from the development of the channels during the growth of the fetus. Again, my understanding is that it is more a location based on confluences than a function or an "organ" for lack of a better description.

I hope I didn't entirely miss the point of what you were asking!

Hi just thought i would put some thoughts down for you.

When you are born, at the time when sperm meets egg, this cell is your first cell and is your tantien, energy centre. this is where life begins for us and will always be the energy centre. The spine is the energy path to the rest of your body and mingmen is the start of the path or the door of life. Directly to the right, left are the kidneys and in front the tantien but they are all the same place of oint where breath goes. They reunite. The breath when breathed into the kidneys stregthens them and thus opens mingmen and alows the energy to raise up the spine. The spine needs to be relaxed and upring and sank down ontop of each other.

The sperm is the catalyst for all bodily processes, without good hormone things work slower and you grow old and week.

Mingmen is not a catalyst the sperm from the kidneys are, qi moves through mingmen and can be strengthened by making the kineys stronger.

Lower body yang, upper yin. Two ends of the spine. Pineal is responsible for hormone generation.

hope this helps and happy to answer more questions.