It is important in moving the mouth, facial expression and in dentistry. It derives its motor nerve supply from the facial nerve, and its blood supply from labial branches of the facial artery.

What is the modiolus of the mouth?

The modiolus is defined in various dental dictionaries as a point lateral to the corner or angle of the mouth where certain muscles of facial expression converge (Jablonski, 1982; Manhold and Balbo, 1985; Harty and Ogston, 1987).

What muscles attach to the modiolus?

In general, nine muscles attach to modiolus: Buccinator, risorius, orbicularis oris, depressor anguli oris, depressor labii inferioris, zygomaticus major, platysma pars modiolaris, levator anguli oris and mentalis. Most of these muscles have dermal terminations [4].

How modiolus is formed?

It is also called as the Fibromuscular condensation where the extrinsic and intrinsic muscles meet together. This point is important in movement of facial muscles, facial expressions and in a treatment point of view for a dentist. The extrinsic and intrinsic muscles which meet to form the modiolus are: Orbicularis oris.

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.

MODIOLUS

19 related questions found

What does the Triangularis muscle do?

The depressor anguli oris muscle (triangularis muscle) is a facial muscle. It originates from the mandible and inserts into the angle of the mouth. It is associated with frowning, as it depresses the corner of the mouth.

What does the Mentalis muscle do?

The mentalis muscle (MT) is the only elevator of the lower lip and the chin, and it provides the major vertical support for the lower lip.

Where is Modiolus found?

The modiolus is a conical shaped central axis in the cochlea. The modiolus consists of spongy bone and the cochlea turns approximately 2.75 times around the central axis in humans. The cochlear nerve, as well as spiral ganglion is situated inside it.

Where is the Mentalis?

The mentalis muscle is a paired muscle located at the tip of the chin. It acts as the primary muscle of the lower lip. The mentalis originates from the mandible (lower jaw) and runs vertically from below the lower lip to the lower part of the chin.

What is the effect of supranuclear lesion of left facial nerve?

Supranuclear involvement produces contralateral paralysis of the lower facial muscles and sparing of the upper muscles due to the bilateral Supranuclear innervation of the latter. Subtle weakness is often difficult to confirm.

What muscle is activated when you smile?

Corrugator superclii – pulls eyebrows together. Zygomatic muscles (major and minor) – move the mouth corners up and outward when we smile. Risorius – the “smile” muscle. Pulls mouth corners laterally (outward) and forms dimples in the cheeks.

What muscle closes the jaw?

The masseter muscle is one of the four muscles responsible for the action of mastication (chewing). When the masseter contracts it causes powerful elevation of the mandible causing the mouth to close.

What is Modiolus quizlet?

Modiolus. the central core of bone within the cochlea. It forms the axis of the cochlear spiral, which coils for 2.75 turns.

How do you pronounce Modiolus?

noun, plural mo·di·o·li [moh-dahy-uh-lahy, muh-].

What is the Helicotrema?

The helicotrema (plural: helicotremas or helicotremata) is a part of the cochlear apex where the scala tympani and scala vestibuli meet. It is located at the termination of the spiral lamina.

Is the mentalis superficial?

The mentalis is a deep muscle of the chin and lower mouth that originates on incisive fossa of the mandible and inserts into the skin of the chin.

How does the mentalis move?

The mentalis muscle causes a weak upward-inward movement of the soft tissue complex of the chin. This raises the central portion of the lower lip. ... Externally, the mentalis muscle contraction causes wrinkling and dimpling of the skin on the chin, as used in expressions of doubt or displeasure.

What Innervates the mentalis?

Mentalis is one of the muscles acting upon the mouth. It arises from the incisive fossa on the anterior aspect of the mandible. It inserts into the skin of the chin. It is innervated by the mandibular branch of the facial nerve (CN VII).

What does the modiolus do?

In facial anatomy, the modiolus is a chiasma of facial muscles held together by fibrous tissue, located lateral and slightly superior to each angle of the mouth. It is important in moving the mouth, facial expression and in dentistry.

What does the cupula do?

The ampullary cupula, or cupula, is a structure in the vestibular system, providing the sense of spatial orientation.

What canals are found inside of the modiolus?

The cochlea is formed by an excavated bony canal, the spiral canal of the cochlea, which is wound helically around a central conical bone axis, the modiolus.

Is the Mentalis innervated by the facial nerve?

The facial nerve innervates all of the muscles of facial expression. Of these, the facial nerve innervates 14 of the 17 paired muscle groups of the face on their deep side. The three muscles innervated on their superficial or lateral edges are the buccinator, levator anguli oris, and mentalis muscles.

What does the depressor Labii Inferioris do?

The depressor labii inferioris is a facial muscle that allows you to pull your lower lip down or to the side.

What are the muscles of mastication?

Muscles

• Temporalis Muscle.
• Medial Pterygoid.
• Lateral Pterygoid.
• Masseter.
• Accessory Muscles of Mastication.