Why is it called the Risorius muscle?
Table of Contents
Why is it called the Risorius muscle?
The risorius muscle is a muscle of facial expression. It arises from the fascia over the parotid gland, and inserts into the angle of the mouth. It is supplied by the facial nerve (CN VII)….
| Risorius | |
|---|---|
| Origin | parotid fascia |
| Insertion | modiolus |
| Artery | facial artery |
| Nerve | buccal branch of the facial nerve |
What does the platysma muscle do?
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.
What does Risorius mean?
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.
What is the action of the Mentalis muscle?
The mentalis originates from the mandible (lower jaw) and runs vertically from below the lower lip to the lower part of the chin. This muscle provides stability to the lower lip to allow it to pout. It causes protrusion of the lower lip and elevates the skin of the chin.
What is the insertion of the Risorius muscle?
Risorius muscle
| Origin | Parotid fascia, Buccal skin, zygomatic bone (variable) |
|---|---|
| Insertion | Modiolus |
| Function | Extends angle of mouth laterally |
| Innervation | Buccal branch of facial nerve (CN VII) |
| Blood supply | Superior labial artery (facial artery) |
What is the position of the Risorius muscle?
The Risorius muscle is one of the large muscles in the face. It is located mainly around the mouth and controls the ability to create a facial expression. It begins around the parotid gland but makes its way all the way around to the platysma muscle. The platysma muscle is found within the neck and chest.
What is the action of platysma?
The main function of the platysma is to contribute to producing a myriad of facial expressions. With its attachment on the modiolus and the lower lip, it can produce an expression of sadness, surprise and horror by lowering the corners of the mouth and lower lip.
What is the Sternohyoid muscle?
As for the sternohyoid muscle, it is a flat muscle located on both sides of the neck. This muscle originated from the medial edge of the clavicle bone, sternoclavicular ligament, and posterior side of the manubrium. The sternohyoid muscle then ascends the neck and attaches to the body of the hyoid bone.
What are the muscles of mastication?
Muscles
- Temporalis Muscle.
- Medial Pterygoid.
- Lateral Pterygoid.
- Masseter.
- Accessory Muscles of Mastication.
What is the orbicularis oculi muscle?
The orbicularis oculi muscle is a muscle located in the eyelids. It is a sphincter muscle arranged in concentric bands around the upper and lower eyelids. The main function of the orbicularis oculi muscle is to close the eyelids.
What is the insertion of the Mentalis?
Anatomical terms of muscle The mentalis muscle is a paired central muscle of the lower lip, situated at the tip of the chin. It originates from the mentum of the mandible, and inserts into the soft tissue of the chin.
What is frontalis muscle?
The frontalis muscle is responsible for elevating the eyebrows, while the corrugator supercilii, orbicularis oculi, and procerus play a role in its depression. The function of the forehead is often spared in middle cerebral artery strokes.