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The tongue is a muscular organ that plays a crucial role in various functions, including speech, taste sensation, mastication, and deglutition (swallowing). It has several muscles that enable its movement and facilitate these functions. The tongue's muscles can be classified as intrinsic or extrinsic, depending on their attachment and the direction of their fibres. The intrinsic muscles, including the superior longitudinal, inferior longitudinal, transverse, and vertical muscles, are responsible for changing the shape and size of the tongue. On the other hand, the extrinsic muscles, such as the genioglossus, hyoglossus, styloglossus, and palatoglossus, enable movements like protrusion, retraction, depression, and elevation of the tongue. This paragraph introduces the topic of tongue muscles and sets the context for exploring the specific muscle responsible for tongue retraction.
| Characteristics | Values |
|---|---|
| Muscle Name | Hyoglossus, Styloglossus |
| Muscle Type | Intrinsic, Extrinsic |
| Muscle Shape | Quadrangular, Thin stripe |
| Muscle Function | Depression, Retraction, Elevation |
| Muscle Attachments | Hyoid Bone, Temporal Bone, Palatine Aponeurosis |
| Innervation | Hypoglossal Nerve (CN XII), Vagus Nerve (CN X) |
| Blood Supply | Lingual Artery, Sublingual Artery |
| Drainage | Lingual Vein, Sublingual Gland |
| Lymphatic Drainage | Marginal, Central, Dorsal Lymphatics |
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What You'll Learn
- The hyoglossus muscle is located in the floor of the mouth and is responsible for tongue retraction and depression
- The styloglossus muscle is thin and paired, located on either side of the oropharynx. It retracts and elevates the tongue
- The genioglossus muscle is innervated by the hypoglossal nerve and is responsible for tongue protrusion
- The palatoglossus muscle is bow-shaped and associated with the tongue and soft palate. It is supplied by the vagus nerve
- The hypoglossal nerve provides motor innervation to the tongue muscles, except for the palatoglossus muscle
The hyoglossus muscle is located in the floor of the mouth and is responsible for tongue retraction and depression
The hyoglossus muscle is located in the floor of the mouth and plays a crucial role in tongue retraction and depression. It is one of the four pairs of extrinsic muscles of the tongue, which also include the genioglossus, styloglossus, and palatoglossus muscles. These extrinsic muscles are responsible for producing movements that the intrinsic muscles cannot, such as protrusion, retraction, depression, and elevation of the tongue.
The hyoglossus muscle originates from the hyoid bone and inserts into the lateral aspects of the tongue. It is a quadrangular muscle, and its width matches the width of the greater horn of the hyoid bone, contributing significantly to the floor of the oral cavity. The hyoglossus muscle works in conjunction with other muscles to facilitate tongue movement and function.
The lingual artery, which is the primary blood supply to the lingual muscles, passes between the hyoglossus and genioglossus muscles. Additionally, the hypoglossal nerve (CN XII) and the lingual nerve traverse the external surface of the hyoglossus muscle on their way to the tongue. The hypoglossal nerve provides motor innervation to all the intrinsic and extrinsic muscles of the tongue, except for the palatoglossus muscle, which is innervated by the vagus nerve (CN X).
The hyoglossus muscle's function in tongue retraction and depression is essential for various oral activities, including mastication (chewing), speech, and deglutition (swallowing). The tongue plays a vital role in manipulating food within the mouth, forming a food bolus, and triggering the swallowing reflex. Additionally, the tongue is crucial for articulation and taste sensation, contributing to our overall sensory experience.
Understanding the anatomy of the tongue, including the structure and function of muscles like the hyoglossus, provides valuable insights into maintaining oral health and addressing any tongue-related issues that may arise.
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The styloglossus muscle is thin and paired, located on either side of the oropharynx. It retracts and elevates the tongue
The styloglossus muscle is a thin, bilaterally paired muscle of the tongue. It is the smallest of the three styloid muscles. The styloglossus muscle is located on either side of the oropharynx. It originates at the apex of the styloid process of the temporal bone and inserts into the lateral aspect of the tongue.
The styloglossus muscle serves the essential function of retracting and elevating the tongue in a posterior and superior direction. This movement helps in drawing up the sides of the tongue to create a trough, facilitating the process of swallowing after chewing food. The styloglossus muscle also aids in retracting the tongue by contracting simultaneously with its counterpart.
The muscle passes between the internal carotid artery and the external carotid artery, dividing upon the side of the tongue near its dorsal surface. Here, it blends with the fibres of the longitudinalis inferior muscle, which is located anteriorly to the hyoglossus muscle. The external and internal fibres of the styloglossus muscle also fuse with parts of the superior pharyngeal constrictor muscle and the palatoglossus muscle, respectively.
The styloglossus muscle is innervated by the hypoglossal nerve (CN XII), which is a cranial nerve. This innervation is shared by the other extrinsic muscles of the tongue, namely the hyoglossus muscle, the genioglossus muscle, and the palatoglossus muscle. These muscles work together to produce the various movements of the tongue, allowing for a range of functions such as speech production and food manipulation.
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The genioglossus muscle is innervated by the hypoglossal nerve and is responsible for tongue protrusion
The genioglossus muscle is a large, thick, paired extrinsic muscle of the tongue that contributes significantly to the shape of the tongue. It arises from the mandibular symphysis and inserts itself onto the body of the hyoid bone and the entire length of the tongue. The genioglossus muscle is innervated by the hypoglossal nerve, also known as cranial nerve XII, which is responsible for the innervation of both the intrinsic and extrinsic muscles of the tongue. The hypoglossal nerve provides motor innervation to all of the intrinsic and extrinsic muscles of the tongue, except for the palatoglossus muscle, which is innervated by the vagus nerve.
The genioglossus muscle is responsible for tongue protrusion, or 'sticking the tongue out', and the depression of the tongue. The left and right genioglossus muscles work together to protrude the tongue anteriorly out of the mouth and deviate it towards the opposite side. When the genioglossus muscles contract, they stabilise and enlarge the portion of the upper airway that is most vulnerable to collapse. This is clinically significant as the genioglossus muscle can be used to test the function of the hypoglossal nerve. A physician can ask a patient to stick out their tongue, and if the hypoglossal nerve is damaged, the tongue will deviate to the side of the lesion.
The genioglossus muscle also has a role in maintaining a clear airway during sleep. Relaxation of the genioglossus and geniohyoid muscles during REM sleep can cause obstructive sleep apnea. However, the mandible can be pulled forward to maximise airway space and prevent the tongue from sinking backwards and blocking the airway. This can be achieved through genioglossus muscle advancement, a surgical approach for patients with obstructive sleep apnea syndrome.
The arterial blood supply to the genioglossus muscle comes from the sublingual branch of the lingual artery, which is a branch of the external carotid artery. The sublingual artery branches at the anterior border of the hyoglossus muscle and passes between the genioglossus and mylohyoid muscles to the sublingual gland. The sublingual artery also supplies blood to the geniohyoid and the gingival mucosa of the mandible. The deep lingual artery, a termination of the lingual artery, passes between the genioglossus muscle and the inferior longitudinal muscle, supplying the apex of the tongue.
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The palatoglossus muscle is bow-shaped and associated with the tongue and soft palate. It is supplied by the vagus nerve
The tongue is a muscular structure that plays a crucial role in various functions, including speech, eating, and swallowing. It has intrinsic and extrinsic muscles that work together to facilitate these functions. One of these extrinsic muscles is the palatoglossus muscle, which has a unique shape and important functions associated with the tongue and soft palate.
The palatoglossus muscle, also known as musculus palatoglossus, is a relatively small muscle that contributes to the complex anatomy of the tongue and soft palate. It is one of the four extrinsic muscles of the tongue, which means it originates outside the tongue but inserts within it. Specifically, it arises from the palatine aponeurosis of the soft palate and inserts into the lateral part of the root of the tongue. Some of its fibres extend over the dorsum of the tongue, while others intertwine with the transverse muscle of the tongue.
The palatoglossus muscle is distinct in its bow-shaped form, and this shape plays a functional role. In the lateral pharyngeal walls, the right and left palatoglossus muscles create ridges known as the palatoglossal arches (anterior faucial pillars). These arches serve as crucial barriers, separating the oral cavity from the oropharynx. This separation prevents the retrograde flow of food and the spillage of saliva from the vestibular region into the oropharyngeal region.
The palatoglossus muscle is associated with the soft palate and tongue and performs specific functions related to these structures. It helps elevate the posterior portion of the tongue and draws the soft palate downwards, narrowing the oropharyngeal isthmus. This action is particularly important during swallowing, as it propels the food bolus towards the oesophagus and prevents its retrograde movement back into the oral cavity. Additionally, the palatoglossus muscle works in conjunction with the palatopharyngeus muscle to elevate the velar region, contributing to velar positioning.
Unlike most other tongue muscles, which are innervated by the hypoglossal nerve (CN XII), the palatoglossus muscle is supplied by the vagus nerve (CN X). This nerve provides motor innervation to the palatoglossus muscle, enabling it to perform its functions in tongue movement and swallowing.
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The hypoglossal nerve provides motor innervation to the tongue muscles, except for the palatoglossus muscle
The tongue is a muscular organ that plays a crucial role in various functions, including speech, swallowing, and moving substances around in the mouth. The hypoglossal nerve, also known as cranial nerve XII, is responsible for providing motor innervation to most of the tongue muscles, enabling their movement and coordination.
The hypoglossal nerve arises from the hypoglossal nucleus of the brainstem, specifically from the medulla oblongata. It travels down the neck, passing between important blood vessels such as the carotid artery and the jugular vein, before ending at the base and underside of the tongue. This nerve provides motor control to both the intrinsic and extrinsic muscles of the tongue, allowing for a wide range of tongue movements.
The intrinsic muscles of the tongue include the superior longitudinal, inferior longitudinal, transverse, and vertical muscles. These muscles are responsible for changing the shape and size of the tongue, such as during tongue rolling, and play a vital role in speech, eating, and swallowing. The hypoglossal nerve innervates these muscles, allowing for precise control over tongue movements.
The extrinsic muscles of the tongue include the genioglossus, styloglossus, and hyoglossus. These muscles are responsible for protruding the tongue, moving it forward and backward, and elevating or depressing it. The hypoglossal nerve innervates all but one of these extrinsic muscles, with the exception of the palatoglossus muscle.
The palatoglossus muscle is unique in that it is innervated by the vagus nerve (CN X) instead of the hypoglossal nerve. This muscle is associated with the soft palate and plays a role in separating the oral and nasal cavities during speech and swallowing. While the hypoglossal nerve controls most tongue movements, the exception is the palatoglossus muscle, which is under the control of the vagus nerve.
Understanding the innervation of the tongue and its associated muscles is crucial for diagnosing and treating various conditions that can affect tongue function. Damage to the hypoglossal nerve, for example, can lead to paralysis or atrophy of the tongue muscles, impacting speech and swallowing abilities. Therefore, a comprehensive knowledge of the hypoglossal nerve and its role in tongue motor control is essential in the field of medicine and anatomy.
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Frequently asked questions
There are several muscles that are involved in retracting the tongue, including the hyoglossus, styloglossus, and genioglossus.
The hyoglossus is a quadrangular muscle that originates from the body and greater horn of the hyoid bone. It passes through the oropharyngeal triangle and inserts into the inferior/ventral parts of the lateral tongue.
The hyoglossus muscle is involved in depressing and retracting the tongue. It also makes up a significant portion of the floor of the oral cavity.
The styloglossus muscle is a thin, paired muscle located on either side of the oropharynx. It originates from the styloid process of the temporal bone and inserts into the lateral aspect of the tongue.
