The longstanding idea that the entire human face ages uniformly is in need of a facelift, say researchers at UT Southwestern Medical Center who have found that multiple, distinct compartments of fat in the face age at different rates.
The findings, published in a recent issue of Plastic and Reconstructive Surgery, challenge previously held theories regarding aging and may offer new ways to help turn back the clock, UT Southwestern plastic surgeons say.
“For hundreds of years, everyone has believed that the fat on the face is one confluent mass, which eventually gets weighed down by gravity, creating sagging skin,” said Dr. Joel Pessa, assistant professor of plastic surgery and the study's lead author. “In our studies, however, we were surprised to find that this is not the case; the face is made up of individual fat compartments that gain and lose fat at different times and different rates as we age.”
The study involved injecting different types of dye into facial cavities of 30 cadavers. Despite at least 24 hours of settling time, the dye, rather than permeating the entire face, stayed in separate areas – showing that individual facial compartments have boundaries between them that act like fences. These fences, which seem to be composed of fibrous tissue, allow the face to maintain its blood supply should it become injured.
Dr. Pessa said the face resembles a three-dimensional puzzle, with fat divided into distinct units around the forehead, eyes, cheeks and mouth. Facial aging is, in part, characterized by how these separate compartments change as we grow older.
A youthful face is characterized by a smooth transition between these compartments. As people age, contour changes occur between these regions due to volume losses and gains as well as repositioning of the compartments. Eventually, this can result in sagging or hollowed skin and wrinkles.