Or maybe take a look on the head’s nerves and veins.
May, 1996:
'We postulate that because of the underlying anatomy, there is a relative microvascular insufficiency to regions of the scalp that lose hair in male pattern baldness and that is associated with local tissue hypoxia [deprivation of oxygen] in those regions. The vascular supply of the scalp is derived from branches of the internal carotid artery and branches of the external carotid artery.
The frontal region of the scalp, which loses hair in male pattern baldness, is supplied by the supraorbital and the supratrochlear arteries. These are relatively small branches of the internal carotid artery system. The temporal [sides] and occipital [back of head] regions of the scalp, which do not lose hair in male pattern baldness, are supplied by larger branches of the external carotid artery. Specifically, these are the superficial temporal, posterior auricular, and occipital arteries. Further, the frontal and vertex regions of the scalp overlie the galea aponeurotica, which is relatively avascular. The temporal and occipital regions of the scalp overlie the temporalis and occipitalis muscles, which provide a rich network of musculocutaneous perforator blood vessels. These anatomic differences contribute to the tenuous nature of the dermal blood supply to the frontal and crown regions of the scalp.'
Frederick Hoelzel, Chicago, 1942:
'To the Editor:— Some questions concerning baldness which were raised by Dr. Ballenger's comments in The Journal, June 27, may be answered by observations which I made while serving as technician in gross anatomy at the College of Medicine of the University of Illinois (1916-1917). I then had occasion to remove the brains of about 80 cadavers for separate use in the neurology classes and incidentally noted a seemingly obvious relation between the blood (vessel) supply to the scalp and the quantity of hair. Baldness occurred in persons in whom calcification of the skull bones apparently had not only firmly knitted the cranial sutures but also
closed or narrowed various small foramens [A natural hole in a bone for the passage of a nerve, artery or a vein or other anatomical structure.] through which blood vessels pass, most prominently in persons with a luxuriant crop of hair. These blood vessels are mainly veins which normally communicate with the diploic veins in the spongy tissue of the skull bones but which are evidently
pinched off by calcification of the foraments.
Various stages of this process of impairing the blood circulation of the scalp could be observed.
This, then, not only explains why baldness occurs but also why men are more likely to become bald than women, since bone growth or calcification is generally greater in males than in females.
Obviously "hair tonics" or vitamins are not likely to restore a blood circulation through what has practically become "solid ivory".'
''Our in vitro investigations revealed that exogenous testosterone and DHT treatment both had striking effects on the induction of VSMC [vascular smooth muscle cells] calcification.'
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4837411/
'The team also looked at blood vessel and valve tissue from people with heart disease who had undergone surgery for their condition. They found that cells from these tissues contained bone-like deposits and also carried the testosterone receptor on their surface.
This suggests that testosterone may trigger calcification in people.'
Testosterone might be involved in explaining why men have a greater risk of heart attacks than women of similar age, according to a study.
www.sciencedaily.com
To the Editor:— Some questions concerning baldness which were raised by Dr. Ballenger's comments in The Journal, June 27, may be answered by observations which I made while serving as technician in gross anatomy at the College of Medicine of the University of Illinois (1916-1917). I then had...
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