What is the origin of the platysma muscle?
The platysma, innervated by the facial nerve, is a thin, sheet-like voluntary muscle. Origin: the muscle has a broad origin with fibers arising from the fascia of the upper thorax including the clavicle, acromial region, pectoralis major and deltoid muscles.
What is the origin of the mentalis?
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 origin of the smile muscle?
The zygomaticus major muscle originates from the upper margin of the temporal process, part of the lateral surface of the zygomatic bone. It inserts into tissue at the corner of the mouth.
What is the Risorius muscle?
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 is the insertion of the platysma?
Platysma
| Origins | Skin/fascia of infra- and supraclavicular regions |
|---|---|
| Insertion | Lower border of mandible, skin of buccal/cheek region, lower lip, modiolus, orbicularis oris muscle |
| Innervation | Cervical branch of facial nerve (CN VII) |
| Blood supply | submental artery (facial artery), suprascapular artery (thyrocervical trunk) |
What is the insertion of the Mentalis?
Mentalis is a paired conical facial muscle located in the chin….Mentalis muscle.
| Origin | Incisive fossa of mandible |
|---|---|
| Insertion | Skin of chin (Mentolabial sulcus) |
| Action | Elevates, everts and protrudes lower lip, wrinkles skin of chin |
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….
| Risorius | |
|---|---|
| Origin | parotid fascia |
| Insertion | modiolus |
| Artery | facial artery |
| Nerve | buccal branch of the facial nerve |
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.
Why is it called the risorius muscle?
Is the risorius involved in smiling?
The risorius muscle’s function is to aid in facial expression by pulling the corner of the mouth laterally via its contraction in an outward and upward motion. In conjunction with other facial muscles, this helps to create a smile or a frown, and myriad other expressions in-between.
What is the origin of the risorius muscle?
The risorius muscle arises from the superficial fascia as a bundle of muscle fibers which pass anteriorly to insert into the angle of the mouth. The bundle is widest at its origin, narrowing towards its insertion. fascia overlying the masseter muscle 4
Where does the risorius begin and end?
The risorius begins around the parotid gland, a salivary gland in the back of the jaw, and wraps around the platysma muscle, a muscle located in the chest and neck. The risorius continues to the skin of the corner of the mouth, where it ends. The facial nerve is directly connected to the risorius muscle.
How does the risorius muscle move the face?
The Risorius muscle continues until the skin from the mouth ends. While moving outward and upward, the muscle works along with the other muscles to create facial movement that moves the face in a cohesive unit. The motion of the muscles will pull the lip and face back to create a number of different facial expressions.
What is the difference between the risorius and Modiolus?
The risorius then interlaces with other muscles that converge towards the angle of the mouth, forming a dense, mobile, fibromuscular mass called the modiolus. Risorius is found in the superficial layer of the facial muscles, coursing over the projection of the line between the alveolar processes of the maxilla and mandible.
