Some people believe that 3rd Layer Galea or Apponurosis (which is a tough sheet like layer under the skin) constricts over the blood vessels passing through it to the skin and does not allow enough blood to pass through it to the skin. This leads to hair loss.
Well this theory is never been proven. Galeatomy or cutting of Galea to relieve the blood vessel constriction is devised with the hope that it will carry more blood to the skin and will therefore control the hair loss.
This theory was never been proven and those who have performed this surgery in the past have never substantiated this belief. It is also important to note that most of the scalp blood supply comes from front and back of the head and not from the underneath the Galea. These vessels are above the Galea and they do not have to cross the Galea.
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