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Ultrasonography of the internal architecture of the superficial part of the masseter muscle in vivo

 Hyung‐Jin Lee  ;  You‐Jin Choi  ;  Kang‐Woo Lee  ;  Kyung‐Seok Hu  ;  Seong Taek Kim  ;  Hee‐Jin Kim 
 Clinical Anatomy, Vol.32(3) : 446-452, 2019 
Journal Title
 Clinical Anatomy 
Issue Date
Adult ; Cadaver ; Female ; Humans ; Male ; Masseter Muscle/anatomy & histology* ; Masseter Muscle/diagnostic imaging ; Tendons/anatomy & histology* ; Tendons/diagnostic imaging ; Ultrasonography/methods ; Young Adult
botulinum neurotoxin ; masseter ; masseteric hypertrophy ; paradoxical masseteric bulging ; ultrasonography
It is unclear whether the deep inferior tendon (DIT) is equally present in vivo, and little anatomical information is available regarding the existence and morphology of the DIT in healthy young subjects. The aim of this study was to characterize the DIT of the masseter muscle in healthy young subjects using ultrasonography and to compare the morphology of this tendon with previously reported data for healthy young subjects in order to provide the most-effective injection methods for botulinum neurotoxin treatments of masseteric hypertrophy. This study investigated two fresh cadavers and 30 healthy subjects. Ultrasonography scanning in both longitudinal and transverse directions was applied to the masseter muscle. The DIT within the superficial part of the masseter was observed in both the fresh cadavers and the living subjects. The posterior region of the masseter muscle was compartmentalized (entirely covered) by the DIT in 26.7% of the specimens. The superficial part of the masseter muscle was divided by the DIT transversely and longitudinally into the superficial and deep muscle bellies in 35% and 38.3% of the specimens, respectively. The present findings suggest applying a DIT-based injection technique under guidance by ultrasonography prior to treating masseteric hypertrophy.
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2. College of Dentistry (치과대학) > Others (기타) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Oral Biology (구강생물학교실) > 1. Journal Papers
Yonsei Authors
Kim, Seong Taek(김성택)
Kim, Hee Jin(김희진) ORCID logo https://orcid.org/0000-0002-1139-6261
Lee, Kang Woo(이강우)
Choi, You Jin(최유진) ORCID logo https://orcid.org/0000-0003-3701-2200
Hu, Kyung Seok(허경석) ORCID logo https://orcid.org/0000-0002-9048-3805
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