Logan Steele
The oesophagus, also known as the food pipe or gullet, is a fibromuscular tube that connects the back of the throat to the top of the stomach. It is a part of the digestive system and is responsible for transporting food and liquid to the stomach. The oesophagus is surrounded by muscles at the top and bottom, which are known as the upper and lower oesophageal sphincters, respectively. These muscles are responsible for opening and closing the oesophagus to allow food and liquid to pass through. The upper oesophageal sphincter is controlled voluntarily, while the lower oesophageal sphincter is not under voluntary control. So, is your oesophagus a muscle?
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What You'll Learn
The oesophagus is a fibromuscular tube
The oesophagus is composed of an external layer of longitudinal muscle and an inner layer of circular muscle. These muscles run both longitudinally and circularly, allowing the oesophagus to actively facilitate the passage of food into the stomach through peristalsis, or rhythmic contractions of the muscles. The upper portion of the oesophagus is under voluntary control, while the remaining portion consists of smooth muscle and is not under voluntary control.
The oesophagus has two muscular rings or sphincters, one at the top and one at the bottom, known as the upper and lower oesophageal sphincters, respectively. These sphincters act to close the oesophagus when food is not being swallowed, preventing the entry of air and the reflux of gastric contents. The upper oesophageal sphincter is an anatomical sphincter formed by the cricopharyngeal part of the inferior pharyngeal constrictor, while the lower oesophageal sphincter is a functional sphincter that does not have a distinct thickening.
The oesophagus is innervated by the oesophageal plexus, which is formed by a combination of parasympathetic and sympathetic fibres from the cervical and thoracic sympathetic trunks. It receives its blood supply from the upper, middle, and lower oesophageal veins, which drain into different lymph nodes.
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The upper oesophageal sphincter
The oesophagus is a hollow, muscular tube that carries food and liquid from the throat to the stomach. It is part of the digestive system and is located behind the trachea. The muscles in the oesophagus propel food and liquid down to the stomach.
At the opening of the upper oesophagus is a ring-shaped muscle called the upper oesophageal sphincter (UES). This sphincter senses when food or liquid is coming towards it. When it receives the signal, the sphincter relaxes and opens to allow food to enter the oesophagus. When there is no food or liquid, the sphincter remains closed.
The UES is also known as the pharyngoesophageal segment (PES) and is a 4-cm segment of the digestive tract. It separates the oesophagus from the pharynx and larynx. The UES is bounded anteriorly by the larynx, posterolaterally by the pharyngoesophageal muscles, superiorly by the pharynx, and inferiorly by the oesophagus. The UES controls the inflow and outflow through the region, preventing aerophagia in the anterograde direction and regurgitation in the retrograde.
The UES has two major functions: to prevent air from entering the oesophagus during breathing, and to prevent reflux of oesophageal contents into the pharynx to guard against airway aspiration. It is located behind the cricoid cartilage and extends above and below it. The UES is a high-pressure zone, and the cricopharyngeus muscle is a major contributor to this pressure. The UES is also influenced by the thyropharyngeus and cervical oesophagus muscles.
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The lower oesophageal sphincter
The oesophagus is indeed a muscle. It is a hollow, muscular tube that connects the back of the throat to the top of the stomach. It is part of the digestive system and allows food and drink to enter the stomach. The oesophagus is about 10-14 inches long and one inch in diameter.
The primary function of the LES is to prevent stomach acid and digestive juices from getting into the oesophagus. It does this by remaining closed except when swallowing. When swallowing, the LES opens to allow food to move down into the stomach. The LES relaxes through the release of VIP and NO, beginning within 2 seconds of the onset of swallowing and lasting about 6 to 10 seconds.
The LES is composed of intrinsic and extrinsic components. The intrinsic component of the LES consists of oesophageal muscle fibres and is under neurohormonal control. The extrinsic component consists of the diaphragmatic crura and the phrenoesophageal ligament, which provide anatomical support to the LES and further protection against gastric reflux.
Any malfunction in either of these components can lead to pathologies such as gastroesophageal reflux disease (GERD), with its associated symptoms and mucosal changes. A weak LES is a common cause of GERD, in which the oesophagus is irritated by stomach acid or bile.
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Peristalsis
The oesophagus is a fibromuscular tube that connects the back of the throat to the top of the stomach. It is part of the digestive system and is responsible for transporting food and drink to the stomach. The oesophagus is a muscular tube, with muscles running both longitudinally and circularly.
The muscle contractions of peristalsis can also move in the reverse direction, known as retroperistalsis, antiperistalsis or reverse peristalsis. This occurs when the vomiting reflex is triggered, moving food backward from the small intestine, back through the stomach, oesophagus and out of the mouth.
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Oesophagus problems
The oesophagus is a muscular tube that carries food and liquid from the throat to the stomach. It is part of the digestive system and is located behind the trachea (windpipe). The primary muscles involved in the functioning of the oesophagus are the upper and lower oesophageal sphincters. The upper oesophageal sphincter (UES) surrounds the upper part of the oesophagus and is made of skeletal muscle. It opens when food or liquid is swallowed, allowing them to enter the oesophagus. The lower oesophageal sphincter (LES) is a functional sphincter that acts as a gate, opening to let food pass through to the stomach and closing to prevent stomach acid and digestive juices from entering the oesophagus.
There are several steps that can be taken to prevent or reduce GERD and other oesophageal problems. These include dietary and lifestyle changes, such as avoiding late-night meals, allowing sufficient time between eating and lying down, limiting spicy and fatty foods, reducing caffeine and carbonated drink intake, and maintaining a healthy weight. Medications, both over-the-counter and prescription, can also help manage symptoms and keep the condition under control. In more severe cases of oesophageal disorders, surgery may be required.
It is important to note that oesophageal disorders can have serious complications if left untreated. Regurgitation caused by GERD or achalasia may result in food entering the trachea (windpipe) and lungs, leading to pneumonia and lung infections. Additionally, swallowing problems associated with oesophageal disorders can increase the risk of malnutrition and dehydration. Therefore, it is crucial to seek medical advice and treatment for any persistent symptoms or concerns related to oesophageal health.
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Frequently asked questions
The esophagus is a hollow, muscular tube that carries food and liquid from the throat to the stomach.
The primary function of the esophagus is to transport food and liquid to the stomach. It is part of the digestive system.
The muscles in the esophagus contract in a rhythmic manner, creating waves of peristalsis that push the contents down to the stomach.
Some common issues with the esophagus include acid reflux, GERD, and heartburn.
