An anatomical study of the risorius in Asians and its insertion at the modiolus

Hong San Kim, Calvin Pae, Jung Hee Bae, Kyung Seok Hu, Brian M. Chang, Tanvaa Tansatit, Hee Jin Kim

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Results: When categorized into three common anatomical types—zygomaticus risorius (ZR), platysma risorius (PR), and triangularis risorius (TR). PR was most common with 45 % (36 cases) frequency. Risorius muscle also inserted into the modiolus in three distinct layers in relation to the depressor anguli oris: superficial, flush, and deep. Superficial attachment was most commonly found with 56.3 % (45 cases) frequency.

Conclusions: These results will provide critical information for future planning and performing of reconstructive, reanimation, and cosmetic surgical procedures for cases such as developmental defect, facial trauma, facial muscle paralysis, and restoring the natural personal appearances.

Purpose: Detailed explanations of the insertion, interaction patterns, and arrangement of the risorius muscle fibers at the modiolus have still not been clearly shown. The aim of this study is to clarify the arrangement of the risorius muscle by means of topographic examination, and to evaluate the anatomical variations in its attachments and pattern of shape to other perioral muscles, and eventually to understand the various features of the facial animation of Asians.

Materials and methods: Eighty embalmed Korean and Thai adult hemifaces from cadavers of both genders were dissected in this study. Detailed dissection at the modiolus revealed the insertion of the risorius muscle in relation to its attachments and fiber interaction forms.

Original languageEnglish
Pages (from-to)147-151
Number of pages5
JournalSurgical and Radiologic Anatomy
Issue number2
Publication statusPublished - 2015 Mar

Bibliographical note

Publisher Copyright:
© 2014, Springer-Verlag France.

All Science Journal Classification (ASJC) codes

  • Anatomy
  • Surgery
  • Pathology and Forensic Medicine
  • Radiology Nuclear Medicine and imaging


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