Which muscle is responsible for protraction of the mandible?

The masseter is primarily responsible for the elevation of the mandible and some protraction of the mandible. It receives its motor innervation from the mandibular division of the trigeminal nerve.

What muscles protract the mandible?

The large masseter and temporalis are powerful elevators of the mandible (Figure 3), assisted by the pterygoid medialis. The pterygoid lateralis, assisted by the digastric (discussed in Section Muscles of the Neck), opens the mouth by depressing and protracting the mandible.

What muscles are involved in mandible protraction and retraction?

The TMJ is a highly versatile joint, allowing for protraction, retraction, elevation, depression and excursion of the mandible. These movements are executed by the masseter, temporalis and pterygoid muscles, innervated by the anterior mandibular division of the trigeminal nerve and irrigated by the maxillary artery.

What muscle moves the mandible?

Function. The major function of the masseter muscle is to elevate the mandible, approximate the teeth.

What muscle Retrudes the mandible?

Bilateral contraction of the lateral pterygoid muscles protrudes and depresses the mandible. A unilateral contraction on a particular side, in conjunction with the ipsilateral medial pterygoid muscle, moves the mandible to the opposite side.

What is orbicularis oris?

Introduction. 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 does protract the mandible mean?

Besides being hilarious on her little face, it’s also a muscle action called mandible protraction, and all the superficial muscles of mastication are involved. … Protraction (on the left) is the act of protrusion, or extending beyond the normal position. The opposing action is called retraction (on the right).

Where is your mandible muscle?

It is a powerful superficial quadrangular muscle originating from the zygomatic arch and inserts along the angle and lateral surface of the mandibular ramus.

What is protraction movement?

Short definition of Protraction (in the context of a term to describe movement of the body): Protraction is movement of a body part in the anterior direction, i.e. being drawn forwards. The movement of protraction is the opposite of the movement of retraction.

What is Buccinator muscle?

The buccinator muscle is the major facial muscle underlying the cheek. It holds the cheek to the teeth and assists with chewing.

Which muscles does not move the mandible?

The following muscle does not produce chewing movements of the mandible: d) Thyrohyoid. The muscles of mastication are the group of muscles that…

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

The lateral pterygoid muscle depresses the mandible and opens the mouth when assisted by the anterior belly of the digastric muscle and the mylohyoid muscle.

Which muscle is primarily responsible for moving the mandible to a lateral position?

Unilateral action of a lateral pterygoid muscle causes contralateral excursion (a form of mastication), usually performed in concert with the medial pterygoids. When they work independently, they can move the mandible side to side.

Which are Infrahyoid muscles?

Infrahyoid muscles are also known as “strap muscles” which connect hyoid, sternum, clavicle and scapula. They are located below the hyoid bone on the anterolateral surface of the thyroid gland and are involved in movements of the hyoid bone and thyroid cartilage during vocalization, swallowing and mastication.

What is the orbicularis oculi muscle?

Introduction. 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 Platysma muscle?

The platysma is a superficial muscle found in the neck. It covers most of the anterior and lateral aspect of the neck. The platysma is a broad muscle which arises from the fascia that covers the upper segments of the deltoid and pectoralis muscles.

What muscles used in kissing?

Orbicularis oris muscle

Orbicularis oris
Nerve cranial nerve VII, buccal branch
Actions It is sometimes known as the kissing muscle because it is used to pucker the lips.
Latin musculus orbicularis oris

What are the kissing muscles?

A ring of muscle encircling your mouth and anchored in your lips, the orbicularis oris (aka the “kissing muscle”) allows you to pucker and close your lips. The orbicularis oris also helps you to release air from the mouth forcibly.

What Innervates orbicularis oris?

The recent 39 th edition of Gray’s Anatomy described that the orbicularis oris muscle is supplied by the buccal and mandibular branches of the facial nerve. Rodel stated that the buccal plexus supplied the muscles of upper lip, check and nose.

What is an example of protraction?

Examples of protraction include: With the shoulder in 90o of abduction, brings the arms forward as if to hug someone. The scapulae begin to slide laterally and then anteriorly along the thorax, this is protraction.

Which muscles protract retract and elevate the tongue?

Extrinsic muscles (genioglossus, hyoglossus, styloglossus, and palatoglossus) protrude, retract, depress, and elevate the tongue. Intrinsic muscles (superior and inferior longitudinal, transverse, and vertical) originate and insert within the tongue as interdigitating sheets of muscle fibers and alter its shape.

Is the Buccinator a muscle of mastication?

[1] Couper and Myot coined the term buccinator in the year 1694. [2] This muscle is sometimes referred to as an accessory muscle of mastication due to its role in compressing the cheeks inwards against molars, thus, aiding in chewing and swallowing.

Where is the anterior mandible located?

The anterior mandible includes the area between the mental foramina and the chin. It is frequently utilized for implant placement or harvesting of autogenous block grafts.

What is the angle of the mandible?

Results: The mean female mandibular right angle was 122.62°, and the left was 124.59° (average, 123.61°). The mean male mandibular right angle was 122.66°, and the left was 124.2° (average, 123.43°). The mean and median values were very similar.

What is maxilla and mandible?

The two maxillary bones are fused at the intermaxillary suture, forming the anterior nasal spine. This is similar to the mandible (lower jaw), which is also a fusion of two mandibular bones at the mandibular symphysis. The mandible is the movable part of the jaw.

What muscles do protraction?

Protraction is accomplished by the actions of the serratus anterior, pectoralis major, and pectoralis minor muscles. Retraction is accomplished by the actions of the trapezius, rhomboids, and latissimus dorsi muscles. The elevation is accomplished by the trapezius, levator scapulae, and rhomboid muscles.

How do you do protraction?

How To Strengthen Shoulders: Scapular PROTRACTION exercises …

What is protraction of arm?

Scapular protraction describes the forward movement of the scapula about the thoracic wall (scapulothoracic joint). As the scapula moves away from the midline it can also be referred to as scapular abduction. This motion usually occurs in conjunction with some scapular lateral rotation.

What does the frontalis muscle do?

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 Innervates the buccinator muscle?

Innervation. The buccinator is innervated by the buccal branches of facial nerve (CN VII).

What is the zygomaticus muscle?

Of all the muscles in the face, the zygomaticus major is perhaps the most noticeable. Sitting between the corners of our lips and the upper part of our cheeks, it controls the way in which we smile. The muscle sits atop the zygomatic bone, otherwise known as the cheekbone.

What is the tongue muscle?

The muscles that form the bulk of the tongue are intrinsic muscles, which run from one part of the tongue to another, and extrinsic muscles, which are attached to bone. There are three extrinsic muscles on each side. Of these the two largest, which we’ll see now, are hyoglossus, and genioglossus.

How does the mandible move?

Mandibular movement around the sagittal axis occurs when one condyle moves inferiorly while the other remains in the terminal hinge position (Figure 4-4). … It does occur in conjunction with other movements, however, when the orbiting condyle moves downward and forward across the articular eminence.

What is the name of the muscle responsible for abduction of the arm?

The primary muscles involved in the action of arm abduction include the supraspinatus, deltoid, trapezius, and serratus anterior.

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

The primary muscles involved in the action of arm abduction include the supraspinatus, deltoid, trapezius, and serratus anterior.

What are the muscles of the mouth?

The orbicularis oris muscle is the “purse string” muscle surrounding the lips. The levator anguli oris muscles and the risorius muscles are close to the zygomaticus major. The risorius may be very thin or even absent. The fibers of the buccinator muscles (one of the muscles of the jaw) also insert into the modiolus.

Where is the temporal muscle?

Gross anatomy

Temporalis is a broad, radiating muscle, situated at the side of the head which arises from the whole of the temporal fossa (except that portion of it which is formed by the zygomatic bone) and from the deep surface of the temporal fascia.

What is lateral pterygoid muscle?

Lateral pterygoid is a two-headed, fan-shaped muscle located in the infratemporal fossa of the skull. It is one of the four masticatory muscles, along with the medial pterygoid, temporalis and masseter muscles. All these muscles act upon the temporomandibular joint (TMJ) to enable chewing (mastication) and biting.

Which muscles help move the jaw during mastication quizlet?

masseters , temporalis , medial pterygoids , and lateral pterygoids .

What four muscles control lower jaw movement?

Which four muscles control movement of the lower jaw? masseter, the temporalis, the medial pterygoid, and the lateral pterygoid.

What Innervates the thyrohyoid muscle?

Innervation. The thyrohyoid muscles are innervated by a branch of the ventral ramus of C1 from the cervical plexus, which courses with the hypoglossal nerve. The nerve fibers are thus not from the hypoglossal nucleus.

What is the Hyoglossus muscle?

The hyoglossus muscle is one of the four intrinsic muscles of the tongue. It is a quadrilateral muscle that originates along the whole length of the hyoid bone and inserts into the side of the tongue. The hyoglossus acts to both depress and retract the tongue.

Which nerve Innervates infrahyoid muscles?

The ansa cervicalis (or ansa hypoglossi) is the union of the C1, C2, and C3 nerves from the cervical plexus, which provides innervation to the infrahyoid muscles (Figure 31.2).

What is Muller’s muscle?

The superior tarsal muscle, known as Muller’s muscle, is a structural muscle which functions to maintain the elevation of the upper eyelid. It receives innervation from the sympathetic nervous system and is unique in that it consists of thin fibers of the smooth muscle.

What kind of muscle is the orbicularis oris?

Orbicularis oris is a complex circular muscle that surrounds the orifice of the mouth and forms the majority of the lips. It belongs to a large group of muscles of facial expression called the buccolabial group.

What is Horner’s muscle?

Horner’s muscle (the palpebral part of the orbicularis oculi muscle) has a fan-shaped origin in the lacrimal bone. Its muscle fibers are oriented from 160 to 210 degrees relative to the ear-eye plane and converge towards the medial palpebral commissure.