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. 2021 May 11;14:467–483. doi: 10.2147/CCID.S301117

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© 2021 Urdiales-Gálvez and Farollch-Prats.

This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License (http://creativecommons.org/licenses/by-nc/3.0/). By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms (https://www.dovepress.com/terms.php).

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Overview of the hyaluronic acid (HA) injectable filler on the muscle activity. Data from de Maio.¹¹ Image courtesy from and reprinted with permission from Allergan plc, Dublin, Ireland.

Abbreviation: N, nasalis; LAN, levator labii superioris alaeque nasi; LLS, levator labii superioris; LAO, levator anguli oris; ZMj, zygomaticus major; ZMi, zygomaticus minor; DSN, depressor septi nasi; DAO, depressor anguli oris; DLI, depressor labi inferiores; B, buccinator; R, risorius; PL, plastisma; OO, orbicularis oris; M, mentalis.