Skulls of three men from North Africa's ancient Garamantian civilisation, which flourished in the Sahara Desert from 3,100 to 1,400 years ago, contain holes and indentations that were made intentionally to treat wounds or for other medical reasons, say anthropologist Efthymia Nikita of the University of Cambridge in England and her colleagues.
     Signs of renewed bone growth around the rims of these cranial openings indicate that the men, who lived roughly 2,000 years ago, survived the procedures. Given the evidence of widespread trade networks in North Africa several thousand years ago, "the knowledge of cranial surgical techniques must have been among the cultural traits that spread among populations," Nikita says.
     Previously excavated North African sites contain the earliest evidence of scraping, cutting or drilling pieces of bone out of people's skulls, a practice known as trepanation. Skull surgery occurred as early as 13,000 years ago in what is now Morocco. Ancient Egyptians performed the technique starting around 4,000 years ago, as did pre-Inca groups living in South America 1,000 years ago. Some modern North African populations have used trepanation to treat headaches following injuries or disease.

Edited from ScienceNews (17 August 2011)