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The cricopharyngeus muscle is a crucial component of the upper esophageal sphincter (UES), which acts as a protective valve between the throat and the esophagus. When functioning properly, this muscle remains tightly closed, preventing food or liquid from entering the lungs. During swallowing, the cricopharyngeus muscle relaxes, allowing ingested substances to pass through the sphincter and into the esophagus. Dysfunction of this muscle can lead to swallowing difficulties, known as dysphagia, and various treatments are available, including dilation, myotomy, and botulinum toxin injection.
| Characteristics | Values |
|---|---|
| Location | Junction of the pharynx (throat) and esophagus |
| Function | Protects the airway and lungs from damaging stomach contents that might be refluxed up through the esophagus into the throat |
| Function | Allows ingested food to be swept from the pharynx into the esophagus |
| Dysfunction | Causes difficulty swallowing |
| Dysfunction | Can cause food to get stuck in the neck within about a second of swallowing |
| Dysfunction | Can cause weight loss |
| Dysfunction | Can cause aspiration of food |
| Treatment | Cricopharyngeus muscle myotomy |
| Treatment | Balloon dilation |
| Treatment | Oral medications |
| Treatment | Botox injection |
| Treatment | Botox injection |
| Length | 3-5 cm |
| Innervation | Recurrent laryngeal nerve |
| Innervation | External branch of the superior laryngeal nerve |
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What You'll Learn
- The cricopharyngeus muscle is a major component of the upper esophageal sphincter
- It is located at the junction of the pharynx (throat) and oesophagus
- Cricopharyngeal dysfunction can cause difficulty swallowing
- Treatment options include dilation, Botox injections, and cricopharyngeus myotomy
- The muscle is innervated by branches of the vagus nerves and the recurrent laryngeal nerve
The cricopharyngeus muscle is a major component of the upper esophageal sphincter
The cricopharyngeus muscle is a striated muscle located at the junction of the pharynx (throat) and oesophagus. It is the major muscular component of the upper oesophageal sphincter (UES), which is also known as the cricopharyngeal muscle. At rest, the UES remains closed, protecting the airway and lungs from stomach contents that might be refluxed up through the oesophagus into the throat. When something is swallowed, the UES relaxes and opens, allowing ingested food or drink to pass from the pharynx into the oesophagus.
The UES is also referred to as the top valve of the oesophagus, or food pipe. It separates the oesophagus and throat. The UES is innervated by branches of the vagus nerves and the recurrent laryngeal nerve. Unlike other muscles, the UES remains flexed and tightly closed unless nerves signal it to relax. This relaxation of the UES is necessary for food, liquid, and saliva to enter the oesophagus.
UES dysfunction can cause difficulty swallowing, or dysphagia. This can be caused by a range of factors, including muscle enlargement, scarring of the muscle, reflux, or changes in the UES or nerve signalling pathways. Diagnosis of UES dysfunction can be accomplished through a variety of methods, including a flexible endoscopic examination, X-ray swallowing tests, and manometry (pressure testing). Treatment options for UES dysfunction include dilation (stretching), oral medications, botulinum toxin injection, and myotomy (cutting).
One specific type of UES dysfunction is the cricopharyngeal bar, which can form from a thickening of the cricopharyngeus muscle caused by the replacement of muscle with fibrous connective tissue. This is often a reaction to chronic reflux of stomach contents into the oesophagus. Fibrosis can cause the UES to become stiffer, meaning it does not open fully during swallowing, obstructing the flow of food into the oesophagus and increasing pressure in the pharynx.
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It is located at the junction of the pharynx (throat) and oesophagus
The cricopharyngeus muscle is located at the junction of the pharynx (throat) and oesophagus. It is a major muscular component of the upper oesophageal sphincter (UES). The UES is the top valve of the oesophagus (food pipe). At rest, the UES closes the passageway between the pharynx and oesophagus, protecting the airway and lungs from stomach contents that might be refluxed up into the throat. When something is swallowed, the cricopharyngeus relaxes and opens, allowing the ingested substance to pass from the pharynx into the oesophagus.
The cricopharyngeus is a striated muscle, innervated by branches of the vagus nerves and the recurrent laryngeal nerve. It is responsible for the high-pressure zone within the EI (esophageal introitus or upper oesophageal sphincter). The cricopharyngeus is the main component of these closure muscles. It is unique in that it remains flexed and tightly closed unless nerves signal it to relax. This protects the throat and windpipe from food or liquid coming back up and inadvertently entering the lungs. For food, liquid, and saliva to enter the oesophagus, the cricopharyngeus must relax as these contents pass through.
Cricopharyngeal dysfunction (CPD) can occur when the cricopharyngeus muscle fails to coordinate its relaxation or expansion, causing dysphagia (difficulty swallowing). CPD can be caused by various conditions, including muscle enlargement (hypertrophy), fibrosis (scarring of the muscle), reflux (heartburn), and changes in nerve signalling pathways. CPD can be diagnosed through a combination of clinical and instrumental swallowing evaluations, including flexible endoscopic evaluation, videofluoroscopic swallow study, and high-resolution manometry.
Treatment for CPD aims to improve swallowing ability and quality of life. Nonsurgical interventions include pharyngoesophageal segment dilation (stretching), botulinum toxin injection, and cricopharyngeus myotomy (cutting the muscle to prevent over-tightening). Dilation procedures can be performed with mild or no sedation, or under general anaesthesia. BOTOX injections cause temporary paralysis or weakening of the cricopharyngeus muscle, typically lasting three to six months. For a permanent solution, some patients may opt for cricopharyngeus myotomy after successful stretching.
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Cricopharyngeal dysfunction can cause difficulty swallowing
The cricopharyngeus muscle is the major muscular component of the upper oesophageal sphincter (UES). It is located at the junction of the pharynx (throat) and oesophagus. When something is swallowed, the cricopharyngeus relaxes and opens, allowing food and drink to pass from the pharynx into the oesophagus.
Cricopharyngeal dysfunction (CPD) occurs when the cricopharyngeus muscle fails to relax or expand during swallowing. This can cause difficulty swallowing, known as dysphagia. People with cricopharyngeal dysfunction may feel as though they have something stuck in their throat, and they may experience choking or pain when swallowing. In severe cases, patients might experience weight loss or aspiration of food.
CPD can be caused by muscular, neurological, or degenerative conditions, as well as muscle enlargement (hypertrophy), scarring of the muscle (fibrosis), stroke, or reflux (heartburn). CPD can also develop spontaneously, with no clear cause.
There are several treatment options for CPD, including oral medications, botulinum toxin (Botox) injections, and surgery. Nonsurgical treatments include the Shaker exercise, which involves lying down, raising the head to look at the feet, and holding for 60 seconds. Patients can also adjust their diet to make swallowing easier, for example by thickening drinks and softening foods.
Surgical treatments for CPD include dilatation, or stretching of the oesophagus, and myotomy, or cutting of the cricopharyngeus muscle. Dilatation can be performed using a balloon catheter, which is passed through the mouth and into the oesophagus. The balloon is then inflated to enlarge the opening. Myotomy can be performed using a laser that is manipulated through the mouth, or through an incision made in the neck.
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Treatment options include dilation, Botox injections, and cricopharyngeus myotomy
The cricopharyngeus muscle, also known as the upper esophageal sphincter (UES), is responsible for a person's ability to swallow. When this muscle malfunctions, it can lead to dysphagia, or difficulty swallowing. Treatment options include dilation, Botox injections, and cricopharyngeus myotomy.
Dilation is a minimally invasive procedure that stretches the cricopharyngeus muscle to widen the opening and allow food and liquid to pass through more easily. This technique employs a catheter with a balloon at the end, which is inserted through the mouth and down into the oesophagus. The balloon is then inflated to enlarge the opening. This treatment significantly improves symptoms for about six months, after which it may be repeated if necessary.
Botox injections, or cricopharyngeal botulinum toxin injections, are another option for treating cricopharyngeus muscle dysfunction. This procedure involves injecting botulinum toxin into the top muscle of the oesophagus, causing it to weaken and relax more easily during swallowing. The injections are typically carried out under general anaesthesia, and their effects are temporary, lasting around three to six months. There is a small risk associated with this treatment, as the botulinum toxin could potentially spread to other muscles in the throat.
Cricopharyngeus myotomy is a surgical procedure that involves cutting the cricopharyngeus muscle to prevent it from over-tightening and blocking food from entering the oesophagus. This treatment can be performed through a neck incision or via a minimally invasive endoscopic procedure, where a laser is inserted through the mouth. Cricopharyngeus myotomy is considered the definitive treatment for cricopharyngeal dysfunction.
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The muscle is innervated by branches of the vagus nerves and the recurrent laryngeal nerve
The cricopharyngeus muscle is a crucial component of the upper esophageal sphincter (UES), located at the junction of the pharynx (throat) and oesophagus. It acts as a protective mechanism by remaining tightly closed at rest, preventing food or liquid from entering the lungs. During swallowing, the muscle relaxes, allowing ingested substances to pass through into the oesophagus.
The proper functioning of the cricopharyngeus muscle is essential for maintaining normal swallowing abilities. Any impairment or malfunction of this muscle can lead to a condition known as cricopharyngeal muscle dysfunction (CPD) or cricopharyngeus muscle dysfunction, resulting in dysphagia, which is the sensation of food getting stuck in the neck shortly after swallowing. CPD can manifest in various ways, ranging from asymptomatic to severe dysphagia.
The cricopharyngeus muscle is innervated by branches of the vagus nerves and the recurrent laryngeal nerve. This innervation plays a critical role in the process of swallowing. When the cricopharyngeus muscle receives signals from these nerves, it relaxes, allowing the ingested bolus to pass through the open sphincter and into the oesophagus. This coordination between nerve signalling and muscle relaxation ensures the smooth passage of food and liquids during swallowing.
Dysfunction of the cricopharyngeus muscle can arise due to various factors, including muscle enlargement, scarring from radiation therapy or trauma, stroke, reflux (heartburn), or changes in nerve signalling pathways. Accurate diagnosis is crucial for effective treatment, which may include nonsurgical interventions such as pharyngoesophageal segment dilation, botulinum toxin injection, or cricopharyngeus myotomy.
In summary, the cricopharyngeus muscle, innervated by branches of the vagus nerves and the recurrent laryngeal nerve, plays a vital role in protecting the airway and facilitating the swallowing process. Dysfunction of this muscle can lead to swallowing difficulties, requiring accurate diagnosis and timely intervention to improve quality of life.
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Frequently asked questions
The cricopharyngeus muscle is the main component of the closure muscles at the junction of the pharynx (throat) and oesophagus. It is also known as the upper oesophageal sphincter (UES) or pharyngoesophageal segment (PES).
The cricopharyngeus muscle is responsible for protecting the throat and windpipe from food or liquid coming back up and inadvertently entering the lungs. It remains flexed and tightly closed unless nerves signal it to relax, allowing food, liquid, and saliva to enter the oesophagus.
When the cricopharyngeus muscle malfunctions, it can cause cricopharyngeal dysfunction or cricopharyngeus muscle dysfunction (CPD), resulting in difficulty swallowing (dysphagia). Treatment options include dilation (stretching), oral medications, BOTOX injection, and myotomy (cutting).
