Hello dear Barbara, I know it’s a bit late but all scientific texts that I have found which speak of the reduction in the diameter of the last segment of the hair are in Spanish, and Google Translate can go crazy trying to interpret these texts. But this morning I found something that might be of interest to you. It is an illustration in the book of Hinkel, I marked the word for easy location.
I haven’t been here for long enough to see this!!!
Now I don’t remember the context of our conversation on this!!!