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Temporal Branch of the Facial Nerve and Its Relationship to Fascial Layers

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Temporal Branch of the Facial Nerve and Its Relationship to Fascial Layers ORIGINAL ARTICLE Temporal Branch of the Facial Nerve and Its Relationship to Fascial Layers Seda T. Babakurban, MD; Ozcan Cakmak, MD; Simel Kendir, MD; Alaittin Elhan, PhD, MD; Vito C. Quatela, MD Objectives: To eliminate the inconsistency in the no- 3 (14.3%), and 4 (14.3%) twigs in the specimens. The menclature, to anatomically and definitively describe the temporoparietal fascia had no attachment to the zygo- topographic relationship of the temporal branch of the matic arch and continued caudally as the superficial mus- facial nerve to the fascial layers and the fat pads, and to culoaponeurotic system. Adhesions were between the tem- create an effective algorithm to define the safest ap- poroparietal fascia and the superficial layer of the deep proaches and planes for surgical procedures in this area. temporal fascia around the zygomatic arch. In most speci- mens, the superficial layer of the deep temporal fascia con- Methods: The study was performed using 18 hemifa- tinued as the parotideomasseterica fascia, and a deep layer cial cadaveric specimens. In 12 hemifacial specimens, the abutted the posterosuperior edge of the zygomatic arch. facial halves were coronally sectioned and dissected. In 6 hemifacial specimens, planar dissection was per- Conclusion: An easy and safe surgical approach in this formed layer by layer. area is to elevate the superficial layer deep to the inter- mediate fat pad directly on the deep layer of the deep tem- Results: The temporal branch of the facial nerve that tra- poral fascia descending to the periosteum along the zy- versed inside the deep layers of the temporoparietal fas- gomatic arch. cia and the superficial musculoaponeurotic system coursed along the zygomatic arch as 1 (14.3%), 2 (57.1%), Arch Facial Plast Surg. 2010;12(1):16-23 HE TEMPORAL BRANCH OF fine the safest approaches and planes for the facial nerve has be- surgical procedures in this area. come of great importance with advanced techniques of deep-plane face-lifting, METHODS Tsubperiosteal midface-lifting, endo- scopic forehead-lifting, and interfascial dis- The study was performed using 18 hemifacial sections in craniofacial and trauma sur- specimens from fixed and fresh cadavers ob- gery. Injury to the temporal branch of the tained from the Department of Anatomy, Fac- facial nerve results in cosmetic defects as ulty of Medicine, Ankara University, Ankara, a result of paralysis of the corrugator su- Turkey. Before dissection, the course of the tem- percilii, frontalis, and orbicularis oculi poral branch of the facial nerve was marked on the skin of each cadaver’s face. First, the Pit- muscles. Understanding the anatomy of anguay line (connecting the lobule with one- Author Affiliations: this area and the trajectory of the tempo- half the distance between the superior border Department of ral branch of the facial nerve is critical to of the external auditory canal and the lateral Otorhinolaryngology, Faculty of preserve it from injury. Despite many stud- canthus) was drawn, and the point at which Medicine, Bas¸kent University, ies1-29 in the literature, controversy re- that line bisected the zygomatic arch was Ankara (Dr Babakurban); mains about the topographic relation- marked. Two other points that were 1.5 cm an- Department of ship of the fascias, the fat pads, and the terior and 1.5 cm posterior to the first point Otorhinolaryngology, Faculty of temporal branch of the facial nerve and its were marked, depending on the length of the Medicine, Acibadem University, nomenclature. The objectives of this study zygomatic arch. Then, second and third lines Istanbul (Dr Cakmak), and were to eliminate the inconsistency in the that bisected the second and third points sepa- Department of Anatomy, rately were drawn from the temporal region to Faculty of Medicine, Ankara nomenclature, to anatomically and defini- the cheek. These 2 coronal strips of tissue were University, Ankara (Drs Kendir tively describe the topographic relation- incised down to the temporal muscle above and and Elhan), Turkey. Dr Quatela ship of the temporal branch of the facial to the masseter muscle below, including a coro- is in private practice in nerve to the fascial layers and the fat pads, nal segment of the zygomatic arch (Figure 1). Rochester, New York. and to create an effective algorithm to de- The 2 sections were en bloc resected, and the (REPRINTED) ARCH FACIAL PLAST SURG/ VOL 12 (NO. 1), JAN/FEB 2010 WWW.ARCHFACIAL.COM 16 Downloaded from www.archfacial.com at Emory University, on March 15, 2010 ©2010 American Medical Association. All rights reserved. Table. Naming of the Fascias and the Fat Pads 1 2 in the Literature Anatomic Name Synonyms Preferred Name Fascia superficialis,1 Superficial temporal Temporoparietal superficial fascia,3,7,10,12,16,17,25,26 fascia temporal fascia, or temporoparietal temporoparietal fascia,2-4,9,12,19 epicranial fascia15 aponeurosis,14 galea,20 aponeurotic fascia,11 subgaleal fascia,13,28 or superficial musculoaponeurotic system7 Fascia temporalis1 or Temporal fascia,14,15,19,21 Deep temporal temporal fascia15 deep temporal fascia fascia,3,9-11,16,17,22,26 superficial temporal fascia,20,25 or temporalis muscle fascia11 Fascia temporalis Innominate fascia,3,12 Superficial layer (lamina superficial layer of deep superficialis),1 of deep temporal temporal temporal fascia, or fascia,3,9,11,14,16,17,19,21 fascia superficial intermediate temporal laminae15 fascia,7,25 or superficial temporal fascia8 Fascia temporalis Deep layer of Deep layer of (lamina profunda),1 deep temporal deep temporal fascia, or fascia3,9,11,14,16,17,19,21 temporal Figure 1. Lines of the 2 coronal strips of tissue. deep laminae15 or deep temporal fascia fascia7,8,12,25 8 anterior and posterior halves of the coronal strips were dis- Temporoparietal fat Suprafascial fat pad, Superficial fat pad15 subaponeurotic pad sected under an operating microscope using magnification of 3,9,26 ϫ ϫ plane, loose areolar 6to 40. In 6 hemifacial specimens, planar dissection from plane,3 loose areolar the skin to the bone was performed layer by layer under the tissue,10,14 innominate operating microscope. fascia,27 superficial fat The nomenclature in the literature is inconsistent for cer- pad,7,11,17,20 or subgaleal tain fascias and the fat pads of this region. Therefore, pre- fat pad20 ferred names (given in the Table and in Figure 2) are used Superficial fat pad15 Interfascial fat pad,8,20 Intermediate fat herein to avoid confusion. superficial fat pad,3,9,14,16 pad intrafascial fat pad,20 intermediate fat RESULTS pad,7,10,11,17 middle fat pad,11 or temporal fat pad29 FASCIAL LAYERS AND FAT PADS Corpus adiposum Subfascial fat pad,8 deep Deep fat pad buccae1 fat pad,3,7,9-11,14,16,17 or The temporoparietal fascia and the deep temporal fascia buccal fat pad29 were identified on the anterior, middle, and posterior parts Temporal branch of Frontal branch,3,7,8,11,12,16-19 Temporal the facial nerve15 or temporal branch of each coronal strip. Above the zygomatic arch, the tem- nervus facialis branch,8,10,11,14,18,20,23-25 poroparietal fascia was composed of multiple (3-4) lay- (rami temporales)1 or frontotemporal ers (Figure 3 and Figure 4) that were integrated with branch9,14,21 thin fibrous septa immediately deep to the subcutane- ous layer. The temporoparietal fascia could be easily dissected in posterior, middle, and anterior parts of specimens. Al- from the superficial layer of the deep temporal fascia above though this layer was thin (Ն2toϽ3 mm) in 36.3% of the zygomatic arch (Figures 5, 6, 7, and 8). Descend- posterior, 36.4% of middle, and 27.3% of anterior parts ing to the zygomatic arch, a discrete fatty layer called the of specimens, it was too thin (Ն1toϽ2 mm) in 27.3% superficial fat pad was encountered between the super- of posterior, 27.3% of middle, and 27.3% of anterior parts ficial layer of the deep temporal fascia and the temporo- of specimens, and was thick (Ն3toϽ4 mm) in 9.1% of parietal fascia (Figures 3 and 5). This fat pad disap- posterior, 36.3% of middle, and 36.3% of anterior parts peared below the middle level of the zygomatic arch. The of specimens. superficial fat pad was encountered in middle parts of The temporoparietal fascia had no attachment to the all specimens. However, this fatty layer was not visible zygomatic arch (Figures 3, 4, and 5). The temporopari- in 27.3% of posterior parts and 9.1% of anterior parts of etal fascia descending to the zygomatic arch lost its fas- specimens. The mean vertical lengths of the superficial cial layers and became a foamy tissue (Figures 3 and 6). temporal fat pad were 14, 20, and 25 mm, respectively, The level of change varied and was observed at approxi- (REPRINTED) ARCH FACIAL PLAST SURG/ VOL 12 (NO. 1), JAN/FEB 2010 WWW.ARCHFACIAL.COM 17 Downloaded from www.archfacial.com at Emory University, on March 15, 2010 ©2010 American Medical Association. All rights reserved. A DTF S D-DTF TPF S-DTF TM IFP SFP DFP ZA MM SMAS PMF B PG Figure 2. Preferred names of the anatomic structures given in the Table. The asterisk marks where the deep layer of the deep temporal fascia (D-DTF) abuts the posterosuperior surface of the zygomatic arch (ZA) on 10 sides. The superficial layers and the deep layers of the deep temporal fascia (DTF) fuse at the anterosuperior surface of the ZA on 4 sides of the cadaveric heads. DFP indicates deep fat pad; IFP, intermediate fat pad; MM, masseter muscle; PG, parotid gland; PMF, parotideomasseterica fascia; S, skin; S-DTF, superficial layer of the DTF; SFP, superficial fat pad; SMAS, superficial musculoaponeurotic system; TM, temporal muscle; TPF, temporoparietal fascia.
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