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The pharyngeal muscles are a group of muscles that form the pharynx, which is a muscular tube that connects the nasal cavities to the larynx and oesophagus. The pharyngeal muscles are organised into two layers: the outer circular layer and the inner longitudinal layer. These muscles are essential for swallowing, as they contract involuntarily to push food into the oesophagus. They also play a critical role in maintaining the pharyngeal airway for proper ventilation and gas exchange. The pharyngeal muscles are involved in various physiological processes and are targeted by several surgical interventions to treat conditions such as obstructive sleep apnea and dysphagia.
| Characteristics | Values |
|---|---|
| Definition | Pharyngeal muscles form the pharynx, which is posterior to the oral cavity. |
| Layers | Two muscular layers: the outer circular layer and the inner longitudinal layer. |
| Outer circular layer | Consists of the superior, middle, and inferior pharyngeal constrictor muscles. |
| Inner longitudinal layer | Comprised of paired muscles: stylopharyngeus, palatopharyngeus, and salpingopharyngeus. |
| Functions | Propels food into the esophagus during swallowing; elevates, shortens, and widens the pharynx and larynx during swallowing and speaking; maintains pharyngeal airway patency for ventilation and gas exchange; affects sound properties as the primary resonating cavity. |
| Innervation | Innervated by the pharyngeal branch of the vagus nerve (CN X), except for the stylopharyngeus muscle, which is innervated by the glossopharyngeal nerve (CN IX). |
| Blood Supply | External carotid artery and its branches: ascending pharyngeal artery, facial artery, lingual artery, and maxillary artery. |
| Venous Drainage | Pharyngeal venous plexus, then into the internal jugular vein. |
| Lymphatic Drainage | Deep cervical nodes, with tonsillar tissues draining to nodes at the angle of the mandible and jugulodigastric node. |
| Surgical Interventions | Uvulopalatopharyngoplasty, pharyngoplasty techniques, pharyngeal flap surgery, and various procedures targeting obstructive sleep apnea, dysphagia, and pharyngeal tumors. |
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What You'll Learn
Pharyngeal muscles are involved in swallowing
The pharyngeal muscles are a group of muscles that form the pharynx, which is posterior to the oral cavity. The pharyngeal muscles are divided into two layers: the outer circular layer and the inner longitudinal layer. The pharyngeal muscles are pivotal in swallowing.
The pharyngeal constrictor muscles form the outer circular layer of the pharynx. This layer consists of three constrictor muscles: superior, middle, and inferior. During swallowing, these muscles constrict to propel a bolus of food downwards. The superior constrictor narrows the upper pharyngeal segment and closes the nasopharynx during swallowing. The middle constrictor arises from the greater and lesser horns of the hyoid bone and the stylohyoid ligament. The circular muscles contract sequentially from superior to inferior to constrict the pharyngeal lumen and thus propel the bolus of food into the oesophagus.
The inner longitudinal layer of the pharyngeal muscles is made up of three paired muscles: the stylopharyngeus, the palatopharyngeus, and the salpingopharyngeus. These muscles act to elevate (shorten and widen) the pharynx and larynx during swallowing and speaking. The stylopharyngeus originates from the styloid process of the temporal bone and inserts onto the pharyngeal wall. The palatopharyngeus originates from the hard palate of the oral cavity and inserts onto the pharyngeal wall. The salpingopharyngeus originates from the Eustachian tube and inserts onto the pharyngeal wall. In addition to contributing to swallowing, it also opens the Eustachian tube to equalise the pressure in the middle ear.
The pharyngeal muscles are also involved in maintaining pharyngeal airway patency for proper ventilation and gas exchange. They counteract negative transluminal air pressure that tends to collapse the airway during inspiration. In obstructive sleep apnea, the activities of pharyngeal muscles are suppressed during sleep, allowing the pharyngeal airway to collapse. The genioglossus, which is the main muscle for tongue protrusion, has a critical role in controlling pharyngeal airway patency.
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They are divided into outer and inner layers
The pharyngeal muscles are a group of muscles located in the pharynx, which is a part of the throat that sits behind the nose and mouth and above the esophagus and larynx. These muscles play a crucial role in swallowing, breathing, and speaking. When it comes to the structure of these muscles, they are indeed divided into two layers: an outer layer called the circular pharyngeal muscle layer, and an inner longitudinal layer. This division allows for a range of movements and functions.
The outer layer, or circular pharyngeal muscle layer, is composed of three pairs of muscles: the superior, middle, and inferior constrictor muscles. These muscles are responsible for the constriction and relaxation of the pharynx during swallowing. They work in a coordinated, wave-like manner to push food and liquid down into the esophagus. This wave-like motion is known as peristalsis. The superior pharyngeal constrictor muscle originates from the base of the skull and inserts into the middle pharyngeal constrictor muscle. The middle pharyngeal constrictor muscle, as the name suggests, sits below the superior muscle and attaches to the upper part of the trachea (windpipe). The inferior pharyngeal constrictor muscle is the lowest of the three and attaches to the thyroid cartilage and cricoid cartilage.
The inner longitudinal layer lies deep within the circular muscle layer and consists of two pairs of muscles: the palatopharyngeus and the palatoglossus. These muscles are involved in lifting and shortening the pharynx during swallowing, as well as in opening and closing the Eustachian tube to equalize pressure in the middle ear. Additionally, they play a role in gagging and vomiting reflexes. The palatopharyngeus muscles extend from the soft palate to the side of the pharynx and then to the hyoid bone, a small U-shaped bone in the front of the neck. The palatoglossus muscles, on the other hand, extend from the soft palate to the tongue and also attach to the hyoid bone.
The coordination and functioning of these two layers of muscles during the act of swallowing, or deglutition, are quite intricate. The process begins with the voluntary initiation of swallowing, which then triggers a series of involuntary, automatic muscle contractions and relaxations. This complex sequence of events is known as the pharyngeal phase of swallowing and is under the control of a brainstem swallowing center. This center coordinates the precise timing and sequencing of muscle activity to ensure a safe and efficient swallow.
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They are supplied by the glossopharyngeal nerve
The pharyngeal muscles are a group of muscles that play a crucial role in the functioning of the pharynx, a tubular structure in the throat that is part of both the digestive and respiratory systems. These muscles are involved in important functions such as swallowing, breathing, and speech. The pharyngeal muscles include the constrictors, which are three muscle groups that surround the pharynx and contract in a wave-like manner during swallowing to propel food and liquid down the esophagus. They also include the levator veli palatini muscle, which raises the soft palate during swallowing to prevent food from entering the nasal cavity, and the palatopharyngeus muscle, which tenses the pharyngeal wall and elevates the larynx during swallowing.
Now, regarding the statement, "They are supplied by the glossopharyngeal nerve": this refers to the innervation of the pharyngeal muscles. The glossopharyngeal nerve, also known as the ninth cranial nerve or CN IX, arises from the brainstem and carries both motor and sensory information. This nerve supplies the pharyngeal muscles with the necessary input for their functioning. More specifically, the glossopharyngeal nerve provides motor innervation to several pharyngeal muscles, including the palatoglossus, which is involved in swallowing and forms part of the soft palate, and the stylopharyngeus, which assists in raising the pharynx during swallowing.
The sensory role of the glossopharyngeal nerve is also significant in relation to the pharyngeal muscles. It carries sensory information from the pharynx, including taste sensations from the posterior one-third of the tongue and sensory input from the middle ear via the auricular branch. This nerve also provides sensory innervation to the palatine tonsil, which is located in the lateral wall of the pharynx. Thus, the glossopharyngeal nerve plays a crucial role in transmitting sensory information that guides the functioning of the pharyngeal muscles during activities such as swallowing and speech.
Additionally, the glossopharyngeal nerve has a parasympathetic component. It carries parasympathetic fibers that form part of the nerve of the cardiac plexus and continue to supply the parotid gland, which is a salivary gland important for lubrication during the process of swallowing. So, the glossopharyngeal nerve not only provides motor and sensory innervation to the pharyngeal muscles but also contributes to the autonomic control of related structures, ensuring the coordinated functioning of the digestive system during activities involving the pharynx.
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Surgical interventions target these muscles
The pharyngeal muscles are a group of muscles that form the pharynx, which is posterior to the oral cavity. These muscles determine the shape of the pharynx's lumen and affect its sound properties as the primary resonating cavity. During swallowing, the pharyngeal muscles contract involuntarily to constrict and widen the pharynx, pushing food into the oesophagus.
There are several surgical interventions targeting the pharyngeal muscles, particularly to treat conditions such as obstructive sleep apnea, dysphagia, and pharyngeal tumours. These procedures aim to protect the airway, improve dysphagia, or provide alimentation by correcting anatomical problems or bypassing affected steps in deglutition.
One common surgery is uvulopalatopharyngoplasty, which treats obstructive sleep apnea by removing excess throat tissue to widen the airway. This may include parts of the uvula, soft palate, and pharyngeal walls. Pharyngoplasty techniques, such as lateral and expansion sphincter pharyngoplasty, can also be used to reconstruct and reposition the pharyngeal muscles, reducing airway obstruction.
Pharyngeal flap surgery is employed to treat velopharyngeal insufficiency by creating a flap from the pharyngeal wall, helping to close the velopharyngeal sphincter during speech. Cricopharyngeal myotomy is another procedure used to manage dysphagia, specifically cervical dysphagia, by cutting into the cricopharyngeus and upper oesophageal muscles.
Laryngectomy is a more invasive procedure considered when the pathology causing aspiration is likely to persist, and there is no hope for the recovery of laryngeal protective function. This surgery, however, adds psychosocial stressors due to the loss of the voice box and cosmetic deformity.
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They maintain pharyngeal airway patency
The pharyngeal muscles are a group of muscles that form the pharynx, which connects the nasal cavities to the larynx and oesophagus. The pharyngeal muscles are organised into two layers: the outer circular layer and the inner longitudinal layer. The outer layer is made up of three constrictor muscles—superior, middle, and inferior—that form a muscular sleeve with a strong internal lining called the pharyngobasilar fascia. The inner layer is made up of paired muscles that act as a group to elevate the larynx, shorten and widen the pharynx, and aid in swallowing and speaking. These muscles include the stylopharyngeus, the palatopharyngeus, and the salpingopharyngeus.
The pharyngeal muscles play a critical role in maintaining pharyngeal airway patency, which is essential for proper ventilation and gas exchange. They counteract negative transluminal air pressure that tends to collapse the airway during inspiration. During swallowing, the pharyngeal muscles contract involuntarily in a sequence known as peristalsis, which helps push food downwards into the oesophagus. The superior thyropharyngeus contracts while the inferior cricopharyngeus relaxes, propelling food into the oesophagus.
In obstructive sleep apnea, a common disorder where patients experience inhibited breathing during sleep, the activities of the pharyngeal muscles are suppressed, allowing the airway to collapse during inspiration. Surgical interventions such as uvulopalatopharyngoplasty, pharyngoplasty, and pharyngeal flap surgery can be used to treat this condition by removing or repositioning tissue to widen the airway.
The pharyngeal muscles are innervated by the vagus nerve (CN X), except for the stylopharyngeus muscle, which is innervated by the glossopharyngeal nerve (CN IX). The blood supply for the muscles is provided by the external carotid artery and its branches, including the ascending pharyngeal artery, facial artery, lingual artery, and maxillary artery. Venous drainage occurs via the pharyngeal venous plexus into the internal jugular vein.
Overall, the pharyngeal muscles' ability to maintain pharyngeal airway patency is crucial for respiratory and digestive functions, and their responsiveness is a key factor in the development of conditions such as obstructive sleep apnea.
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Frequently asked questions
Pharyngeal muscles are a group of muscles that form the pharynx, which connects the nasal cavities to the larynx and oesophagus.
The pharyngeal muscles help determine the shape of the pharynx, affecting its sound properties as the primary resonating cavity. They also propel food into the oesophagus during swallowing.
Yes, there are two main groups of pharyngeal muscles: longitudinal and circular. The longitudinal muscles include the stylopharyngeus, palatopharyngeus, and salpingopharyngeus. The circular muscles, also known as pharyngeal constrictors, include the superior, middle, and inferior constrictors.
Pharyngeal muscles are important in maintaining the patency of the pharyngeal airway for proper ventilation and gas exchange. Dysfunction of these muscles can lead to disorders such as obstructive sleep apnea, dysphagia, and pharyngeal tumors, which may require surgical interventions.
