What does risorius muscle mean?

The risorius muscle is a narrow bundle of muscle fibers that becomes narrower from its origin at the fascia of the lateral cheek over the parotid gland and superficial masseter and platysma muscles, to its insertion onto the skin of the angle of the mouth.

What does risorius mean in Latin?

From post-classical Latin risorius from post-classical Latin risorius ridiculous, laughing from classical Latin rīsor laugher (from rīs-, past participial stem of rīdēre to laugh + -or) + -ius, suffix forming adjectives.

What is a Buccinator muscle?

Buccinator muscle plays a role in stabilizing the denture by gripping the polished surface of the denture. Also, the longitudinal fibers hold the bolus of food between the teeth during mastication.

What is depressor Anguli?

The depressor anguli oris (triangularis) is a facial muscle associated with frowning. It originates from the mandible and inserts into the angle of the mouth. The muscle is innervated by the marginal mandibular branch of the facial nerve and receives its blood supply from the facial artery.

What is the main function of the Platysma muscle?

The platysma is responsible for drawing the skin around the lower part of your mouth down or out, which creases the skin in your lower face, according to the Loyola University Medical Education Network.

Why is it called Risorius?

The risorius is a muscle of facial expression which arises in the fascia over the parotid gland and, passing horizontally forward, superficial to the platysma, inserts onto the skin at the angle of the mouth….

What is the medical definition of risorius muscle?

Medical Definition of risorius. : a narrow band of muscle fibers arising from the fascia over the masseter muscle, inserted into the tissues at the corner of the mouth, and acting to retract the angle of the mouth.

How does the risorius work to produce a smile?

Action. The risorius retracts the angle of the mouth to produce a smile, albeit an insincere-looking one that does not involve the skin around the eyes. Compare with a real smile, which raises the lips with the action of zygomaticus major and zygomaticus minor muscles and causes “crow’s feet” around the eyes using the orbicularis oculi muscles.

Where is the risorius located in the face?

Unsourced material may be challenged and removed. The risorius is a muscle of facial expression which arises in the fascia over the parotid gland and, passing horizontally forward, superficial to the platysma, inserts onto the skin at the angle of the mouth.

How does the risorius retract the angle of the mouth?

The risorius retracts the angle of the mouth to produce a smile, albeit an insincere-looking one that does not involve the skin around the eyes.

https://www.youtube.com/watch?v=rm5Bt-CE6Ls