The Frontal Region
The frontal region is relatively self-explanatory, as the name says it all. Your frontal region is "front" and center on your head. It includes your hairline and extends to your temples. You may have also heard this region called the "forelock."
The frontal region is often where men experience a receding hairline. Intriguingly, a slight recession is entirely normal in adults once they reach maturity. However, if your hairline keeps creeping back, you likely have male-pattern baldness, which is one of the most common forms of hair loss. Indeed, most men begin to notice hair loss first in the frontal region before any other area on their head.
The Mid-Scalp Region
Next, we travel to the mid-scalp region, which is also relatively self-explanatory based on its name. This region is the middle portion of your head. If you were to take a string and wrap it over the top of your head from temple to temple, you would be able to locate the start of the mid-scalp region.
Essentially, this area includes a band of hair that is about as wide as each ear. It is sandwiched between the frontal region and the crown.
Generally, the mid-scalp region is not one of the first areas we lose hair. Rather, it is an area where men, in particular, can experience thinning in the later stages of hair loss. However, women may experience thinning around the temples, above their ears, and along their part line, which partially falls in the mid-scalp region.
The Vertex Transition Point
Where the first two regions are relativity straight forward to identify on your head, the vertex transition point is a little more challenging to figure out. This region is sometimes referred to as the posterior hairline because the two points of the mid-scalp and frontal region come together.
Think of the frontal region as a vertical plane on your scalp and the mid-scalp as a horizontal plane. Where those two points meet is where the vertex transition zone occurs. More simply? It is a small area where your head shape starts to slant slightly higher to meet your crown.
Men commonly show signs of hair loss on the vertex transition point. As it is a point that connects the front and back of your head, you (and others) will likely see hair loss from this area.
Unlike the vertex transition point, the crown is a little easier to identify, and most of us generally know where to find this region. The crown is the highest region that extends to the occipital bone on the back of your head. Sometimes, we also refer to the crown as the vertex.
People commonly lose hair in this region. Because it is difficult to see in a mirror, we often miss hair loss in this region until it has progressed quite a bit. If you want to stay on top of hair loss, watch for early signs of thinning by having the same person look at your crown each month or take a picture.