Correspondence: Dr Bernstein, 77 Scripps Dr, Sacramento, CA 95825 (firstname.lastname@example.org).
I wish to compliment Park and his colleagues on the fine article, "Anatomy of the Corrugator Supercilii Muscle," published in the Archives of Facial Plastic Surgery.1 It is indeed a welcome contribution, as it explains the reason why some individuals show multiple corrugations, as evidenced by flattish vertical creases lateral to the distinct glabellar creases that appear rather early in life.
Bernstein L. Comments on Anatomy of the Corrugator Supercilii Muscle. Arch Facial Plast Surg. 2004;6(4):272-273. doi:10.1001/archfaci.6.4.272