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The risorius muscle: anatomic considerations with reference to botulinum neurotoxin injection for masseteric hypertrophy

Authors
 Jung Hee Bae  ;  Da Yae Choi  ;  Jae Gi Lee  ;  Kyle K. Seo  ;  Tanvaa Tansatit  ;  Hee Jin Kim 
Citation
 DERMATOLOGIC SURGERY, Vol.40(12) : 1334-1339, 2014 
Journal Title
DERMATOLOGIC SURGERY
ISSN
 1076-0512 
Issue Date
2014
MeSH
Adult ; Aged ; Aged, 80 and over ; Botulinum Toxins, Type A/therapeutic use* ; Cadaver ; Dissection ; Facial Expression ; Facial Muscles/anatomy & histology* ; Female ; Humans ; Hypertrophy/drug therapy ; Injections ; Male ; Masseter Muscle/pathology* ; Middle Aged ; Neuromuscular Agents/therapeutic use*
Abstract
BACKGROUND: The botulinum neurotoxin Type A (BTX) injection into the masseter muscle often causes a change in the facial expression. There is as yet no precise anatomic evidence to support this etiologic factor of constrained facial expressions.
OBJECTIVE: The aim of this study was to clarify the location and boundaries of the risorius muscle and its topographical relationship with the surrounding structures.
MATERIALS AND METHODS: This study involved the dissection of 48 hemifaces. The locations of origin and insertion points of the risorius muscle were measured, and the masseter muscle was divided into 6 equally sized rectangular areas.
RESULTS: Cases where the masseter muscle was covered by the risorius muscle were classified into the following 4 types: in Type A, Area III was partially covered by the risorius (17.8%); in Type B, Area VI was partially covered (20.0%); in Type C, Areas III and VI were partially covered (53.3%); and in Type D, Areas II, III, and VI were covered (6.7%).
CONCLUSION: These findings suggest that the medial part of the masseter muscle represents a hazard zone into which the injection of BTX may affect the risorius muscle, potentially resulting in iatrogenic unnatural facial expressions.
Full Text
http://ovidsp.ovid.com/ovidweb.cgi?T=JS&CSC=Y&NEWS=N&PAGE=fulltext&AN=00042728-201412000-00008&LSLINK=80&D=ovft
DOI
10.1097/DSS.0000000000000223
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Oral Biology (구강생물학교실) > 1. Journal Papers
Yonsei Authors
Kim, Hee Jin(김희진) ORCID logo https://orcid.org/0000-0002-1139-6261
Bae, Jung Hee(배정희)
Lee, Jae Gi(이재기)
Choi, Da Yae(최다예)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/138292
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