It is interesting that a person goes bald with MPB in a pattern that is exactly over the galea area of scalp.
Another interesting fact is that no hair grows on the forehead.
There are two muscle groups situated on opposite sides of the galea, the frontalis muscles in the forehead, which pull the galea forwards when the eyebrows are raised, are also flexed with with various other facial expressions.
The occipital muscles are in back of the head behind the ears and they pull the scalp backwards. The occipitals don't get much exercise and they continue to get weaker and atrophied with age.
My theory/hypothesis is that as the occipital muscles continue to get weaker, the frontalis muscles of the forehead remain strong and too tight and this creates an imbalance condition causing the scalp to become thin and shiny... as DHT becomes backed up due to inadequate lymphatic drainage.
Hair does not grow on the forehead possibly due to enzymes in that region that inhibit hair growth. These enzymes can migrate into the galea region, due to weakened lymphatic vessels - causing temporal recession and hair thinning. Sometimes these enzymes can even affect the eyebrows, causing eyebrow balding too. Usually DHT causes massive HAIR GROWTH but the opposite seems to occur in the scalp. Scalp hair eventually becomes allergic to DHT causing miniaturization along with the miniaturization associated with thinner scalp skin.
When the occipital muscles in the back of the head become too weak it is similar to when the abdominal muscles become weaker and people begin to have pot-guts and bad backs due to the tight back muscles and weak abdominals.
By strengthening the occipital muscles in the back of the head, it becomes possible to restore the galea and other scalp tissues to a more youthful condition, allowing for hair REGROWTH.