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● H e l p ● L e a r n t o e d i t ● C o m m u n i t y p o r t a l ● R e c e n t c h a n g e s ● U p l o a d f i l e
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A p p e a r a n c e
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P e r s o n a l t o o l s
● C r e a t e a c c o u n t ● L o g i n
P a g e s f o r l o g g e d o u t e d i t o r s l e a r n m o r e ● C o n t r i b u t i o n s ● T a l k
( T o p )
1 S t r u c t u r e
T o g g l e S t r u c t u r e s u b s e c t i o n
1 . 1 A t t a c h m e n t s
1 . 2 I n n e r v a t i o n
1 . 3 V a s c u l a t u r e
1 . 4 V a r i a t i o n
1 . 5 R e l a t i o n s
2 F u n c t i o n
3 C l i n i c a l s i g n i f i c a n c e
4 O t h e r a n i m a l s
5 A d d i t i o n a l i m a g e s
6 R e f e r e n c e s
7 E x t e r n a l l i n k s
T o g g l e t h e t a b l e o f c o n t e n t s
R i s o r i u s
2 2 l a n g u a g e s
● ا ل ع ر ب ي ة ● C a t a l à ● D e u t s c h ● E s p a ñ o l ● ف ا ر س ی ● F r a n ç a i s ● H r v a t s k i ● I t a l i a n o ● ע ב ר י ת ● M a g y a r ● N e d e r l a n d s ● 日 本 語 ● P o l s k i ● P o r t u g u ê s ● R o m â n ă ● Р у с с к и й ● S l o v e n š č i n a ● С р п с к и / s r p s k i ● S r p s k o h r v a t s k i / с р п с к о х р в а т с к и ● ไ ท ย ● 粵 語 ● 中 文
E d i t l i n k s
● A r t i c l e ● T a l k
E n g l i s h
● R e a d ● E d i t ● V i e w h i s t o r y
T o o l s
T o o l s
A c t i o n s
● R e a d ● E d i t ● V i e w h i s t o r y
G e n e r a l
● W h a t l i n k s h e r e ● R e l a t e d c h a n g e s ● U p l o a d f i l e ● S p e c i a l p a g e s ● P e r m a n e n t l i n k ● P a g e i n f o r m a t i o n ● C i t e t h i s p a g e ● G e t s h o r t e n e d U R L ● D o w n l o a d Q R c o d e ● W i k i d a t a i t e m
P r i n t / e x p o r t
● D o w n l o a d a s P D F ● P r i n t a b l e v e r s i o n
I n o t h e r p r o j e c t s
● W i k i m e d i a C o m m o n s
A p p e a r a n c e
F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
The risorius muscle is a highly variable muscle of facial expression . It has numerous and very variable origins, and inserts into the angle of the mouth. It receives motor innervation from branches of facial nerve (CN VII) . It may be absent or asymmetrical in some people. It pulls the angle of the mouth sidewise, such as during smiling.
Structure
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The risorius muscle is highly variable.[1]
Attachments
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Its peripheral attachments may include (some or all of): the parotid fascia , masseteric fascia , the fascia enveloping the pars modiolaris of the platysma muscle , fascia overlying the mastoid part of temporal bone , and/or the zygomatic arch .[1]
Its apical and subapical (i.e. convergent) attachment is at the modiolus .[1]
Innervation
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The risorius receives motor innervation from the buccal branch of the facial nerve (CN VII) .[1]
Vasculature
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The risorius receives arterial supply mostly from the superior labial artery .[1]
Variation
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The risorius muscle is highly variable. It ranges in form from one or more slender bundles to a wide (yet thin) fan.[1] asymmetrical .[2]
Relations
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It is superficial to the masseter muscle , partially overlying it.[3]
Function
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The risorius muscle draws the angle of the mouth lateral-ward.[1] smile ,[4] [1]
Clinical significance
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Because it partially overlies the masseter muscle, it may be unintentionally affected during botox injections, resulting in unnatural facial expressions.[3]
Other animals
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It has been suggested that the risorius muscle is only found in Homininae (African great apes and humans ).[5]
Additional images
[ edit ]
References
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This article incorporates text in the public domain from page 385 of the 20th edition of Gray's Anatomy (1918)
^ a b Bae, Jung-Hee; Choi, Da-Yae; Lee, Jae-Gi; Seo, Kyle K.; Tansatit, Tanvaa; Kim, Hee-Jin (December 2014). "The Risorius Muscle: Anatomic Considerations With Reference to Botulinum Neurotoxin Injection for Masseteric Hypertrophy" . Dermatologic Surgery . 40 12 ): 1334–1339. doi :10.1097/DSS.0000000000000223 . ISSN 1076-0512 . PMID 25393348 . S2CID 29325936 .
^ Wilson, P. D. (2014). "Anatomy of Muscle" . Reference Module in Biomedical Sciences . Elsevier . doi :10.1016/B978-0-12-801238-3.00250-6 . ISBN 978-0-12-801238-3
^ Page 288 in Diogo, R.; Wood, B. (2011). "Soft-tissue anatomy of the primates: Phylogenetic analyses based on the muscles of the head, neck, pectoral region and upper limb, with notes on the evolution of these muscles" . Journal of Anatomy . 219 (3 ): 273–359. doi :10.1111/j.1469-7580.2011.01403.x . PMC 3171772 PMID 21689100 .
External links
[ edit ]
Wikimedia Commons has media related to
Risorius .
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Risorius&oldid=1222221875 " C a t e g o r i e s : ● W i k i p e d i a a r t i c l e s i n c o r p o r a t i n g t e x t f r o m t h e 2 0 t h e d i t i o n o f G r a y ' s A n a t o m y ( 1 9 1 8 ) ● M u s c l e s o f t h e h e a d a n d n e c k H i d d e n c a t e g o r i e s : ● C S 1 m a i n t : l o c a t i o n m i s s i n g p u b l i s h e r ● A r t i c l e s w i t h s h o r t d e s c r i p t i o n ● S h o r t d e s c r i p t i o n m a t c h e s W i k i d a t a ● C o m m o n s c a t e g o r y l i n k i s o n W i k i d a t a ● A r t i c l e s w i t h T A 9 8 i d e n t i f i e r s
● T h i s p a g e w a s l a s t e d i t e d o n 4 M a y 2 0 2 4 , a t 1 7 : 3 2 ( U T C ) . ● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
This article incorporates text in the public domain from page 385 of the 20th edition of Gray's Anatomy (1918)
