Mourning is a extended practice in funerals of many cultures all over the world. Not just in Ancient Egypt, but also in some other African cultures, in the ancient Assyria or in Archaic Greece.
Aztec ritual weeping; Florentine Codex, Book 1. Photo: http://www.mexicolore.co.uk
I recently wrote a short text about mourning in Ancient Egypt for www.mexicolore.co.uk, an on-line platform for the diffusion of Aztec culture. My contribution was just a small text included in an article about the mourning among the Aztecs.
Aztec culture proves, not only that crying for the dead in funerals is a practice inherent to human being, but also that hair is an essential element during the «ritual weeping», as it happened in Ancient Egypt.