Corpus: Risorius muscle: Unterschied zwischen den Versionen

Aktuelle Version vom 15. Oktober 2024, 11:03 Uhr

from Latin: ridere - to laugh

Definition

The risorius muscle is a superficial muscle located in the region of the mouth and cheek that pulls the corners of the mouth to the side. It is part of the facial expression (mimic) musculature.

Course

The risorius muscle originates from the skin of the cheek and the fascia overlying the masseter muscle. Its fibers run medially toward the modiolus at the corner of the mouth, where they insert.

Innervation

The risorius muscle is innervated by the zygomatic and buccal branches of the facial nerve (cranial nerve VII).

Function

The primary function of the risorius muscle is to pull the corners of the mouth laterally and slightly backward, widening the mouth. While often referred to as a "smile muscle," this term is not entirely accurate, as the risorius does not elevate the corners of the mouth. However, it does play a role in expressions associated with laughter, working together with the zygomaticus major muscle. The risorius muscle is closely fused with the underlying skin, causing the skin to follow its movements.

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-{{Raw}}
+''from Latin: ridere - to laugh''
-''from Latin: ridere - to laugh''<BR>
-''Synonym: laughter muscle''
 ==Definition==
-The '''risorius muscle''' is a superficial muscle in the area of the mouth and cheek that pulls the corners of the mouth to the side. It is part of the mimic musculature.<dcembed ratio="16x9"><dcEmbedUrl src="https://www.doccheck.com/de/detail/photos/42974-musculus-risorius"></dcEmbedUrl></dcembed>
+The '''risorius muscle''' is a superficial [[Corpus:muscle|muscle]] located in the region of the [[Corpus: Mouth|mouth]] and [[Corpus:Cheek|cheek]] that pulls the corners of the mouth to the side. It is part of the [[Corpus:Muscle|facial expression (mimic) musculature]].<dcembed ratio="16x9"><dcEmbedUrl src="https://www.doccheck.com/de/detail/photos/42974-musculus-risorius"></dcEmbedUrl></dcembed>
 ==Course==
-The risorius muscle has its ''origin'' in the skin of the cheek and on the fascia of the masseter muscle. The fibres run medially to the modiolus at the corner of the mouth, where they find their ''insertion''.
+The risorius muscle originates from the skin of the cheek and the [[Corpus:fascia|fascia]] overlying the [[Corpus:Masseter muscle|masseter muscle]]. Its fibers run medially toward the [[Corpus:Modiolus|modiolus]] at the corner of the mouth, where they insert.
 <dcembed><dcembedurlskatchfab src="https://sketchfab.com/3d-models/7345fef21ca5490b9411a5044e77158f" ui_controls="1"></dcembedurlskatchfab></dcembed>
 ==Innervation==
-The risorius muscle is innervated by the rami zygomatici and the rami buccales of the VII cranial nerve (facial nerve).
+The risorius muscle is innervated by the zygomatic and buccal branches of the [[Corpus:Facial nerve|facial nerve]] (cranial nerve VII).
 ==Function==
-The risorius muscle pulls the corners of the mouth laterally and dorsally, making the mouth wider. Strictly speaking, the term "smile muscle" is therefore not entirely correct, as the muscle does not lift the corners of the mouth. However, it is involved in laughter together with the zygomaticus major muscle. The risorius muscle is fused with the corium, which means that the skin follows the muscle movements.
+The primary function of the risorius muscle is to pull the corners of the mouth laterally and slightly backward, widening the mouth. While often referred to as a "smile muscle," this term is not entirely accurate, as the risorius does not elevate the corners of the mouth. However, it does play a role in expressions associated with laughter, working together with the [[Corpus:Greater zygomatic muscle|zygomaticus major muscle]]. The risorius muscle is closely fused with the underlying skin, causing the skin to follow its movements.
 <dcembed ratio="16x9"><dcembedurl src="https://www.doccheck.com/de/detail/videos/4050-musculus-risorius"></dcembedurl></dcembed>