An Anatomical Guide to the Terminal Facial Artery: Lumen Diameter and Associated Anatomy Relevant to Dermatologic Procedures.

Background: Dermal filler injection in the vicinity of the terminal facial artery (FA) can lead to vascular compromise with devastating consequences, including tissue necrosis, blindness, and stroke.

Objective: The purpose of this study was to examine lumen diameter and other anatomical features of the terminal FA relevant to dermal filler injection.

Materials And Methods: Eighteen embalmed adult cadavers were dissected along the distribution of the terminal FA. Gross and microscopic measurements were taken at predetermined points in its course.

Results: Mean lumen diameter was largest at the midpoint between the oral commissure and the lateral supra-alar crease (0.81 ± 0.36 mm; point P1) and smallest at the midpoint between the lateral supra-alar crease and the medial canthus (0.43 ± 0.23 mm; point P3). Mean cutaneous depth was deepest at the lateral supra-alar crease (5.06 ± 1.84 mm; point P2) and most superficial at the midpoint between the lateral supra-alar crease and the medial canthus (3.13 ± 2.07 mm; point P3).

Conclusion: The large-caliber lumen diameter of the terminal FA creates the potential for intra-arterial injection with commonly used filler needles and blunt-tipped cannulas at all points in its course in the nasolabial fold and midface.