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The genioglossus muscle is a large upper airway dilator muscle that is responsible for moving the tongue forward and widening the oropharyngeal airway during inspiration. It is innervated by the hypoglossal nerve (CN XII) and is involved in preventing the collapse of the airway during breathing. The muscle originates from the superior mental spine on the posterior surface of the mandible and attaches to the superior surface of the hyoid body and along the length of the ventral tongue from root to apex.
| Characteristics | Values |
|---|---|
| Innervation | Hypoglossal nerve (CN XII) |
| Arterial Supply | Sublingual and submental arteries |
| Origin | Superior mental spine on the posterior surface of the mandible |
| Insertion | Body of hyoid bone and intrinsic muscles of tongue |
| Action | Protrudes and depresses tongue |
| Function | Moves the tongue forward and widens the oropharyngeal airway during inspiration |
| Embryology | Close relationship between the genioglossus, the base of the skull (occipital bone), and the hyoid bone |
| Blood Supply | External carotid artery |
| Pathology | Hypoxia can alter muscle metabolism and cause functional muscle weakness |
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What You'll Learn
- The genioglossus muscle is innervated by the hypoglossal nerve
- The muscle is supplied blood by the external carotid artery
- Genioglossus activity is dependent on central and peripheral chemoreceptor responsiveness
- Electrical stimulation of the muscle improves airway patency
- The muscle is involved in moving food around the mouth
The genioglossus muscle is innervated by the hypoglossal nerve
The genioglossus muscle is one of the four extrinsic muscles of the tongue. It is a large upper airway dilator muscle that moves the tongue forward and widens the oropharyngeal airway during inspiration. This muscle is innervated by the hypoglossal nerve (CN XII).
The hypoglossal nerve is a motor nerve that originates from the hypoglossal nucleus in the brainstem. It exits the skull through the hypoglossal canal and supplies motor function to the muscles of the tongue, including the genioglossus. The nerve is responsible for the protrusion and depression of the central portion of the tongue. During unilateral contraction, the genioglossus muscle moves the tongue laterally to the opposite side, and during bilateral contraction, it protrudes and depresses the tongue.
The genioglossus muscle plays a crucial role in preventing the collapse of the airway during breathing. Its activity is influenced by respiratory drive and negative pressure reflex stimulation. Additionally, electrical stimulation of the hypoglossal nerve that innervates the genioglossus muscle can improve airway patency. This is particularly relevant in the context of obstructive sleep apnea (OSA), where reduced genioglossus muscle activity after sleep onset is considered a pathogenic factor.
The genioglossus muscle has a fan-shaped structure and originates from the superior mental spine on the posterior surface of the mandible. It extends posterosuperiorly and attaches to the hyoid bone and the ventral tongue, from root to apex. The right and left genioglossus muscles are separated posteriorly by the lingual septum but blend with each other anteriorly.
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The muscle is supplied blood by the external carotid artery
The genioglossus muscle is a large upper airway dilator muscle that is responsible for moving the tongue forward and widening the oropharyngeal airway during inspiration. It is innervated by the hypoglossal nerve (CN XII) and is involved in preventing the collapse of the airway during breathing. The muscle is supplied blood by the external carotid artery.
The genioglossus is one of four extrinsic muscles of the tongue, which also include the hyoglossus, styloglossus, and palatoglossus. These muscles are responsible for the movement of the tongue, while the intrinsic muscles determine the tongue's shape. The genioglossus muscle specifically acts to protrude and depress the central portion of the tongue during bilateral contraction and moves the tongue laterally to the opposite side during unilateral contraction.
The muscle originates from the superior mental spine on the posterior surface of the mandible and extends posterosuperiorly to attach to the superior surface of the hyoid body and along the length of the ventral tongue from root to apex. The right and left genioglossus muscles are separated by the lingual septum posteriorly but blend with each other anteriorly.
The genioglossus muscle plays a crucial role in maintaining airway patency. When the activity of this muscle is reduced, such as through the use of muscle relaxants or dense airway anesthesia, airway collapse can occur, leading to obstructive sleep apnea (OSA). Conversely, electrical stimulation of the genioglossus muscle or the hypoglossal nerve that innervates it can improve airway patency.
The blood supply to the genioglossus muscle is provided indirectly by the external carotid artery. This artery is a major blood vessel that supplies oxygenated blood to the head and neck region. It arises from the common carotid artery and has several branches that provide blood flow to various structures in the area, including the genioglossus muscle.
The external carotid artery plays a vital role in ensuring adequate blood circulation to the genioglossus muscle, which, in turn, contributes to its proper functioning. The muscle's activity is essential for maintaining airway patency and preventing airway collapse during breathing. Therefore, the external carotid artery indirectly contributes to respiratory function by ensuring the genioglossus muscle receives sufficient oxygenated blood to carry out its role in the upper airway.
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Genioglossus activity is dependent on central and peripheral chemoreceptor responsiveness
The genioglossus is an extrinsic muscle of the tongue that moves the tongue forward and widens the oropharyngeal airway during inspiration. It is innervated by the hypoglossal nerve (CN XII) and supplied by the sublingual and submental arteries. The genioglossus is responsible for preventing the collapse of the airway during breathing.
Genioglossus activity is influenced by central and peripheral chemoreceptor responsiveness. Chemoreceptors are stimulated by changes in the chemical composition of their environment and are involved in controlling processes such as breathing. Peripheral chemoreceptors, located in the carotid and aortic bodies, detect changes in the partial pressure of oxygen (pO2) as blood leaves the heart. When low oxygen levels are detected, impulses travel via the glossopharyngeal and vagus nerves to the medulla oblongata and pons in the brainstem, triggering responses that aim to restore pO2. These responses include increased respiratory rate and tidal volume, directing blood flow to the kidneys and brain, and increased cardiac output.
Central chemoreceptors, on the other hand, are located in the medulla oblongata of the brainstem and detect changes in the partial pressure of carbon dioxide (pCO2). The mechanism of pCO2 detection is complex and related to changes in the pH of Cerebrospinal Fluid (CSF). A decrease in pCO2 leads to a decrease in ventilation, while an increase in pCO2 stimulates respiratory centres to increase ventilation. Central chemoreceptive elements also respond to changes in hydrogen ion concentration in the interstitial fluid in the brain, influencing ventilatory and circulatory adjustments during hypercapnia.
The interaction between peripheral and central chemoreceptors is not fully understood, but they likely influence each other and contribute to respiratory control. For example, peripheral chemoreceptor stimulation can lead to coronary vasodilation and peripheral vasoconstriction, while central chemoreceptive structures can modify peripheral chemoreceptor responses by altering discharges in supplying nerves. Genioglossus activity increases in response to chemical stimulation and is influenced by both respiratory drive and negative pressure reflex stimulation. Therefore, the activity of the genioglossus muscle is dependent on the responsiveness of central and peripheral chemoreceptors.
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Electrical stimulation of the muscle improves airway patency
The genioglossus is a large upper airway dilator muscle that is responsible for moving the tongue forward and widening the oropharyngeal airway during inspiration. It is innervated by the hypoglossal nerve (CN XII) and is involved in preventing the collapse of the airway during breathing.
Electrical stimulation of the genioglossus muscle has been found to improve upper airway patency. This has been observed in studies on both humans and animals. In one study, electrical stimulation of the genioglossus muscle in patients with obstructive sleep apnea resulted in improved airflow dynamics and reduced airway collapsibility. The evidence suggests that these improvements are due to the selective recruitment of the genioglossus muscle, rather than non-specific activation of the pharyngeal musculature or arousal from sleep.
Another study found that electrical stimulation of the hypoglossal nerve, which innervates the genioglossus muscle, also improved airway patency. This form of nerve electrical stimulation has been proposed as a treatment for obstructive sleep apnea, especially for patients who do not tolerate continuous positive airway pressure (CPAP) therapy. Hypoglossal nerve stimulation leads to significant improvements in objective and subjective measurements of OSA severity. However, its invasive nature currently limits its application.
Overall, electrical stimulation of the genioglossus muscle or the hypoglossal nerve has been shown to be effective in improving airway patency. This has important implications for the treatment of obstructive sleep apnea and other respiratory conditions where airway patency is compromised. Further research and clinical trials are needed to optimize these electrical stimulation techniques and determine their long-term efficacy and safety.
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The muscle is involved in moving food around the mouth
The genioglossus muscle is a large extrinsic muscle of the tongue that is responsible for moving the tongue forward and widening the oropharyngeal airway during inspiration. It originates from the superior mental spine on the posterior surface of the mandible and attaches to the superior surface of the hyoid body and along the length of the ventral tongue from root to apex. The muscle is innervated by the hypoglossal nerve (CN XII) and plays a crucial role in preventing the collapse of the airway during breathing.
The genioglossus muscle is involved in moving food around the mouth. This movement of food within the mouth is essential for forming a bolus, which refers to the chewed food that is ready to be swallowed and further digested in the stomach. The tongue, including the genioglossus muscle, works in conjunction with the other muscles of the mouth to manipulate food and create the bolus. This process ensures that food is properly prepared for the next stages of digestion.
The genioglossus muscle has a close relationship with the base of the skull (occipital bone) and the hyoid bone. It receives its blood supply indirectly from the external carotid artery. The muscle's activity can vary during obstructive events and is influenced by the state of sleep or wakefulness. For example, muscle relaxants or dense airway anesthesia can reduce genioglossus muscle activity, promoting airway collapse and exacerbating conditions like obstructive sleep apnea (OSA).
The genioglossus muscle is one of four extrinsic muscles of the tongue, including the styloglossus, hyoglossus, and palatoglossus. These extrinsic muscles work together to determine the movement of the tongue, while the intrinsic muscles, such as the vertical, transverse, superior longitudinal, and inferior longitudinal muscles, influence the tongue's shape. The genioglossus muscle specifically helps in protruding and depressing the central portion of the tongue during bilateral contraction.
The health of the genioglossus muscle is crucial for maintaining proper airway function and breathing during sleep. Its activity can be influenced by various factors, including chemical stimulation, respiratory drive, and negative pressure reflex stimulation. Additionally, the muscle's function can be impacted by oral pathologies and systemic diseases, further highlighting its importance in maintaining overall health and well-being.
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Frequently asked questions
The genioglossus muscle is a large upper airway dilator muscle that is responsible for moving the tongue forward and widening the oropharyngeal airway during inspiration. It is one of the four extrinsic muscles of the tongue.
The genioglossus muscle is innervated by the hypoglossal nerve (CN XII).
The genioglossus muscle is involved in multiple actions. During unilateral contraction, it laterally moves the tongue to the opposite side. During bilateral contraction, it protrudes the tongue and depresses the central portion of the tongue.
