The masseter is primarily responsible for the elevation of the mandible and some protraction of the mandible.
Which muscle is responsible for the hallux extension? extensor hallucis longus.

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What muscles protract the mandible?

Actions: Acting bilaterally, the lateral pterygoids protract the mandible, pushing the jaw forwards. Unilateral action produces the ‘side to side’ movement of the jaw. Note: Contraction of the lateral pterygoid will produce lateral movement on the contralateral side.

Which is the chief muscle help in protraction of mandible?

Function. The medial pterygoid muscle functions to assist with elevation and protrusion of the mandible. It also assists the lateral pterygoid muscle with side to side mandibular motion to help with the grinding of food.

Which of the following is a muscle that moves the mandible?

MuscleOriginAction
Masseterzygomatic archElevates mandible
TemporalisTemporal and frontal bonesElevates mandible
Medial pterygoidSphenoid (Lateral pterygoid plate)Elevates mandible; moves mandible side to side
Lateral pterygoidSphenoid (Lateral pterygoid plate)Opens jaws, protrudes mandible; moves mandible side to side
Which muscle moves the mandible forward?

The lateral pterygoid muscle pulls the mandible forwards (anterior translatory movement). During this process the mandible moves slightly downwards because the condyle is pressed down on the articular tubercle. The mandible is pulled backwards on closing by the posterior fibres of the temporalis muscle.

Which muscles elevate the mandible quizlet?

The medial pterygoid helps to elevate the mandible, while the lateral pterygoid protracts its.

What is Buccinator muscle?

The buccinator muscle plays an active role along with orbicularis oris and superior constrictor muscle during swallowing, mastication, blowing, and sucking. It aids in mastication and blowing by compressing the cheek inwards.

Which of the following muscles is a depressor of the mandible?

Among all the four muscles of mastication (medial pterygoid, lateral pterygoid, masseter, and temporalis), the lateral pterygoid is the only muscle that depresses the mandible. The action of all the other three muscles of mastication results in elevation of the mandible.

What is temporal muscle?

The temporalis muscle is a thin, fan-shaped muscle situated within the temporal fossa of the skull. Along with the medial pterygoid, lateral pterygoid and masseter muscles, it belongs to the group masticatory muscles. The temporalis muscle runs superficially, from the temporal bone to the coronoid process of mandible.

What is Ramus of mandible?

The rami are two vertical processes located on either side of the body; they join the body at the angle of the mandible. At the superior aspect of each ramus, the coronoid and condylar processes articulate with the temporal bone to create the temporomandibular joint which permits mobility.

Which muscle opens the jaws and protrudes the mandible?

The masseter muscle provides powerful elevation and protrusion of the mandible by originating from the zygomatic arch and inserting along the angle and lateral surface of the mandible. The temporalis muscle originates from the floor of the temporal fossa and inserts onto the coronoid process of the mandible.

Which muscle has an origin on the anterior mandible?

OriginSuperficial part: maxillary process of zygomatic bone, Inferior border of zygomatic arch (anterior 2/3) Deep part: deep/inferior surface of zygomatic arch (posterior 1/3)
InsertionLateral surface of ramus and angle of mandible
InnervationMasseteric nerve of mandibular nerve (CN V3)
Which muscle is dome shaped and functions in inspiration?

The diaphragm, located below the lungs, is the major muscle of respiration. It is a large, dome-shaped muscle that contracts rhythmically and continually, and most of the time, involuntarily. Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges.

What muscles are connected to the jaw?

The jaw muscles move the jaw in a complex three-dimensional manner during jaw movements. There are three jaw-closing muscles (masseter, temporalis, and medial pterygoid) and two jaw-opening muscles (lateral pterygoid and digastric). The basic functional unit of muscle is the motor unit.

How does the mandible move?

Mandibular movement around the horizontal axis is an opening and closing motion. … When the condyles are in their most superior position in the articular fossae and the mouth is purely rotated open, the axis around which movement occurs is called the terminal hinge axis.

What is protrusion movement?

Protrusion refers to the movement of a structure in an anterior (forward) direction. … I call protrusion the kissing movement because it occurs when you pucker your lips like you’re going to give someone a kiss or stick out your tongue. Moving the mandible (lower jaw) forward is also an example of protrusion.

Which of the following muscles has an insertion on the mandible quizlet?

The masseter also protracts the mandible; it originates on the zygomatic arch and inserts on the mandible (external surface of angle and ramus). The temporalis muscle additionally retracts the mandible. Its origin is the temporal bone (fossa) and its insertion is the mandible (coronoid process and ramus).

Which muscle can depress the mandible quizlet?

The Lateral Pterygoid can also depress the Mandible.

Which nerve Innervates the muscles that elevate the mandible quizlet?

Consequently they are innervated by a branch of the trigeminal nerve (CN V), the mandibular nerve.

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.

What is orbicularis oris muscle?

Orbicularis oris muscle, also known as musculus orbicularis oris is a complex, multi-layered muscle which attaches through a thin, superficial musculoaponeurotic system to the dermis of the upper lip and lower lip and serves as an attachment site for many other facial muscles around the oral region.

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.

Where is the Buccinator muscle?

The buccinator muscle is a thin quadrilateral facial muscle that is the main component of the cheek.

What is the name of the muscle that is shaped like a fan and contacts three cranial bones?

Temporalis muscleOrigintemporal lines on the parietal bone of the skull and the superior temporal surface of the sphenoid boneInsertioncoronoid process of the mandible and retromolar fossaArterydeep temporal arteriesNervedeep temporal nerves, branches of the anterior division of the mandibular nerve (V3)

Where is the temporalis muscle?

The temporalis muscle attaches above to the bone and fascia in the temporal fossa, superior to the zygomatic arch, and below to the coronoid process of the mandible and along the mandibular ramus (Figure 6-17). The temporalis muscles primarily close the jaw while the middle fibers bilaterally retrude the mandible.

What is the action of the orbicularis oris?

OriginMedial aspects of maxilla and mandible, perioral skin and muscles, modiolusActionCloses mouth, compresses and protrudes lips

What is the trapezius muscle?

The trapezius is a muscle that starts at the base of your neck, goes across your shoulders and extends to the middle of your back. The trapezius (traps muscle) helps you move your head, neck, arms, shoulders and torso. It also stabilizes your spine and helps with posture.

What muscles are in the temple?

The temporalis muscle is a fan-shaped muscle located near the temples of the head/face. The temporalis muscle originates from the temporal fossa (the depressed area of the temporal bone) and the temporal fascia (the tendinous connective tissue that lies beneath the skin on top of the temporal bone).

What is maxilla and mandible?

The maxilla (plural: maxillae /mækˈsɪliː/) in vertebrates is the upper fixed (not fixed in Neopterygii) bone of the jaw formed from the fusion of two maxillary bones. In humans, the upper jaw includes the hard palate in the front of the mouth. … The mandible is the movable part of the jaw.

What muscles attach to the coronoid process of the mandible?

The temporalis muscle inserts on the coronoid process of the mandible, with some fibers inserting further down on the ventral margin of the masseteric fossa. The lateral pterygoid muscle inserts on the medial surface of the mandibular condyle.

Where is mandibular fossa?

Each mandibular fossa or glenoid fossa forms the temporal component of the TMJ. It is a concave area on the inferior border of the squamous part of the temporal bone that is also referred to as the articular fossa.

Where is the masseter muscle located?

The masseter is a rectangular-shaped muscle in your face and jaw and is one of the primary muscles of mastication, or chewing. It consists of three distinct layers and works with nearby muscles to move your temporomandibular joint and jaw bone.

What are muscles of facial expression?

The muscles of facial expression (also known as the mimetic muscles) can generally be divided into three main functional categories: orbital, nasal and oral. These striated muscles broadly originate from the surface of the skull and insert onto facial skin.

Which of the following muscles is named for its shape?

Shape: The deltoid (triangular), trapezius (trapezoid), serratus (saw‐toothed), and rhomboideus major (rhomboid) muscles have names that describe their shapes.

What is origin and insertion of muscles?

A skeletal muscle attaches to bone (or sometimes other muscles or tissues) at two or more places. If the place is a bone that remains immobile for an action, the attachment is called an origin. If the place is on the bone that moves during the action, the attachment is called an insertion.

Which muscle is square shaped and located in the lumbar region?

The quadratus lumborum is a thick, square-shaped muscle located at the very back of the abdominal wall. Specifically, this muscle originates from the iliac crest and then travels up the lower back and inserts on the 12th rib on both sides of the rib cage as well as the first four lumbar vertebrae (L1L4).

What are inspiratory muscles?

Muscles that helpful in expanding the thoracic cavity are called the inspiratory muscles because they help in inhalation, while those that compress the thoracic cavity are called expiratory muscles and they induce exhalation.

Which muscle is dome shaped and functions in inspiration quizlet?

The diaphragm is the primary muscle used in the process of inspiration, or inhalation. It is a dome-shaped sheet of muscle that is inserted into the lower ribs. Lying at the base of the thorax (chest), it separates the abdominal cavity from the thoracic cavity.

Which muscles are actively involved in inspiration?

The most important muscle of inspiration is the diaphragm; however, the external intercostals assist with normal quiet breathing. Contraction of the diaphragm increases the space in the thoracic cavity and the lungs fill with air from the external environment.

Which of the following muscles originates at the mandible bone?

Mylohyoid: The mylohyoid is a broad flat muscle which forms the floor of the oral cavity. It originates from the mandible and attaches to the hyoid bone. Geniohyoid: The deepest of the suprahyoid muscles, the geniohyoid muscle originates from the mandible and attaches to the hyoid bone.