Tongue Muscles: How They Work And Protrude

The tongue is a muscular organ that plays a role in digestion, taste perception, speech, and breathing. It is made up of eight different muscles, including four paired intrinsic muscles and four extrinsic muscles. The genioglossus muscle, one of the extrinsic muscles, is responsible for protruding the tongue. This muscle arises from the mandible and inserts into the hyoid bone and the bottom of the tongue. When the genioglossus muscle contracts, it protrudes the tongue forward and depresses the center of the tongue at its back.

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Genioglossus muscle

The genioglossus is an extrinsic muscle of the tongue, which means it is responsible for the tongue's movement rather than its shape. It is a thick, fan-shaped muscle that makes up a large part of the tongue. The genioglossus muscle is paired, with a left and right portion that meet at the midline of the tongue.

The genioglossus muscle protrudes the tongue, depressing the centre of the tongue at its back. The left and right muscles work together to protrude the tongue directly forward and out of the mouth. When one side contracts, the tongue deviates to the opposite side. The muscle's horizontal and oblique compartments are believed to be responsible for this action.

The genioglossus is innervated by the hypoglossal nerve, as are all muscles of the tongue except for the palatoglossus. Blood is supplied to the sublingual branch of the lingual artery, a branch of the external carotid artery. The muscle's size can affect the function of the temporomandibular joint.

The genioglossus muscle also plays a role in enlarging and stabilising the upper portion of the respiratory tract. This section of the respiratory tract is susceptible to involuntary collapse, so the genioglossus is important for sleep apnea patients. Contraction of the genioglossus can help to prevent the tongue from sinking backwards under anaesthesia and blocking the airway.

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Horizontal and oblique compartments

The genioglossus muscle is responsible for protruding the tongue. It is one of the paired extrinsic muscles of the tongue. The genioglossus is innervated by the hypoglossal nerve, as are all muscles of the tongue except for the palatoglossus. The muscle is divided into left and right portions at the midline of the tongue by a septum made of connective tissue. The muscle arises from the mental spine of the mandible and inserts onto the hyoid bone and the bottom of the tongue. The left and right genioglossus muscles protrude the tongue anteriorly out of the mouth and deviate it towards the opposite side.

The genioglossus muscle's horizontal and oblique (posterior fascicles) compartments are believed to be responsible for protruding the tongue. The horizontal compartment is believed to function largely in the respiratory actions of the tongue, moving the hyoid and base of the tongue anteriorly during inspiration to dilate the airway. The horizontal compartment is also involved in tongue protrusion.

The oblique compartment of the genioglossus muscle is quite different from the horizontal compartment. The oblique genioglossus has two parallel rows of large distinct muscle fascicles. These fascicles fan out from their origin on the mandible to insert throughout most of the tongue's length. The oblique genioglossus is thin anteriorly and becomes progressively wider toward the posterior aspect of the tongue. The oblique genioglossus is also involved in tongue protrusion.

The styloglossus muscle is a thin, paired muscle located on either side of the oropharynx. It arises from the styloid process and contributes to the stylomandibular ligament. The styloglossus is the most lateral of the tongue muscles. Its contraction results in the retrusion of the tongue; it also elevates the tongue's lateral margin.

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Tongue's intrinsic muscles

The tongue is a muscular organ composed of eight muscles, four intrinsic and four extrinsic. The intrinsic muscles originate and are attached to other structures within the tongue. They are responsible for altering the shape of the tongue, while the extrinsic muscles are responsible for moving the tongue in different directions.

The four intrinsic muscles are:

• Superior longitudinal muscle
• Inferior longitudinal muscle
• Vertical muscle
• Transverse muscle

These muscles alter the shape of the tongue by lengthening and shortening it, curling and uncurling its apex and edges, and flattening and rounding its surface. This provides shape and helps facilitate speech, swallowing, and eating. For example, the superior longitudinal muscle shortens and curls the tongue upward.

The intrinsic muscles of the tongue are involved primarily in changing the shape of the tongue, which is essential for speaking. The tongue moves food around the mouth with the help of the buccinator muscle, mixes it with saliva, and helps to separate undesired particles. It also enables the formation of the food bolus in the oral preparatory phase of swallowing.

The extrinsic muscles of the tongue are attached to the hyoid bone, mandible, styloid process, soft palate, and pharynx. The genioglossus muscle, one of the extrinsic muscles, is responsible for protruding the tongue.

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Tongue's extrinsic muscles

The tongue is a muscular organ made up of eight muscles, four of which are extrinsic. The extrinsic muscles are attached to the bone and are responsible for moving the tongue in different directions. The four extrinsic muscles are the genioglossus, the hyoglossus, the styloglossus, and the palatoglossus.

The genioglossus muscle is one of the paired extrinsic muscles of the tongue. It is a fan-shaped muscle that comprises the bulk of the body of the tongue. It arises from the mental spine of the mandible and inserts into the hyoid bone and the bottom of the tongue. The left and right genioglossus muscles protrude the tongue anteriorly out of the mouth and deviate it towards the opposite side. They are innervated by the hypoglossal nerve, as are all muscles of the tongue except for the palatoglossus. The contraction of the genioglossus muscle protrudes the tongue, and its horizontal and oblique (posterior fascicles) compartments are believed to be responsible for this action.

The hyoglossus muscle is located in the floor of the oral cavity, immediately lateral to the geniohyoid. It arises from the hyoid and inserts into the side of the tongue. Contraction of the hyoglossus muscle results in the retrusion and depression of the tongue's lateral margin.

The styloglossus is a thin, paired muscle, located on either side of the oropharynx. It originates at the styloid process and temporal bone and inserts into the side of the tongue. It retracts and elevates the tongue.

The palatoglossus arises from the palatine aponeurosis and inserts across the tongue. It elevates the posterior portion of the tongue. It is the only extrinsic muscle of the tongue that is not innervated by the hypoglossal nerve but by the vagus nerve (CN X). It is also involved in initiating swallowing and preventing the spill of saliva from the vestibule into the oropharynx by maintaining the palatoglossal arch.

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Tongue's paired muscles

The tongue is a muscular organ made up of eight muscles that work together to change the shape and size of the tongue. These muscles also guide speech, eating, and swallowing. The tongue has both intrinsic and extrinsic muscles. The intrinsic muscles are responsible for changing the shape of the tongue, while the extrinsic muscles move it in different directions.

The genioglossus muscle is one of the paired extrinsic muscles of the tongue. It is a fan-shaped muscle that makes up a significant part of the tongue's body. The genioglossus muscle arises from the mental spine of the mandible and attaches to the hyoid bone and the bottom of the tongue. When contracted, the genioglossus muscle protrudes the tongue. The left and right genioglossus muscles work together to protrude the tongue forward and depress the centre of the tongue at its back. They also cause the tongue to deviate towards the opposite side.

The styloglossus is another paired extrinsic muscle of the tongue. It is a thin muscle located on either side of the oropharynx. The styloglossus muscle is responsible for depressing and retracting the tongue.

In addition to the genioglossus and styloglossus muscles, there are four paired intrinsic muscles of the tongue: the superior longitudinal, inferior longitudinal, transverse, and vertical muscles. These muscles are named based on the direction in which they travel.

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