The Larynx: Anatomy, Function, and Common Disorders
Updated: 16 minutes ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026
TL;DR: The larynx, commonly known as the voice box, is a hollow tube located in the middle of the neck that facilitates breathing, sound production, and airway protection. It houses the vocal cords and plays a vital role in respiratory health and verbal communication.
Quick Answer: The larynx is a 4-to-5-centimeter hollow tube situated above the windpipe and esophagus in the neck. As a key component of the respiratory system, it funnels air to the lungs and contains the vocal cords necessary for creating sound. Beyond its role in speech, the larynx acts as a protective barrier, utilizing the epiglottis to prevent food and liquid from entering the airway during swallowing.
Anatomy of the Larynx
The larynx is a complex structure primarily composed of cartilages, muscles, and ligaments. These components work together to provide structural support, enable movement during swallowing, and facilitate the vibrations required for vocalization. Its position in the neck changes over time, moving from a higher position in early childhood to its permanent location in the middle of the neck by age two.
Physiologically, the larynx is divided into three distinct regions: the supraglottis (upper part), the glottis (middle part), and the subglottis (lower part). Of these, the glottis is the most critical for communication as it contains the vocal folds, or vocal cords.
Region | Location | Key Components |
Supraglottis | Upper Larynx | Epiglottis, structural cartilage |
Glottis | Middle Larynx | Vocal folds (vocal cords) |
Subglottis | Lower Larynx | Connection to the trachea |
Primary Functions
The larynx serves three essential roles in the human body: respiratory conduction, vocalization, and airway protection.
Breathing and Airflow
As a part of the respiratory system, the larynx acts as a conduit for air. When you inhale through the nose or mouth, the larynx ensures that air is directed down into the trachea and eventually to the lungs.
Sound Production
The presence of vocal cords within the glottis allows for the creation of sound. By manipulating the tension and airflow across these cords, the larynx enables speech, singing, and shouting.
Protective Mechanisms
During the process of swallowing, the larynx moves upward, and a flap of tissue called the epiglottis covers the opening to the trachea. This mechanical action ensures that food and drink are directed into the esophagus rather than the lungs, preventing choking and aspiration.
Conditions and Disorders
Various factors can impact the health of the larynx, ranging from temporary infections to long-term structural changes. Overuse of the voice and environmental irritants are common triggers for laryngeal issues.
Common Laryngeal Ailments
Laryngitis: This inflammation of the voice box can be acute (short-term) or chronic (lasting over three weeks). It is often caused by infections, smoking, or acid reflux (see our guide to laryngopharyngeal reflux).
Vocal Cord Lesions: Overusing the voice can lead to the development of noncancerous growths such as nodules, polyps, or cysts.
Laryngeal Cancer: Malignant growths can develop in any part of the larynx, with risks significantly increased by tobacco and heavy alcohol consumption. Learn more in our guide to laryngeal cancer.
Condition | Primary Symptoms | Common Causes |
Acute Laryngitis | Hoarseness, sore throat | Viral infection, vocal strain |
Vocal Cord Paralysis | Weak voice, breathing difficulty | Nerve damage, trauma |
Laryngeal Lesions | Persistent voice changes | Chronic vocal overuse |
Diagnosis and Treatment
Medical professionals use several diagnostic tools to evaluate laryngeal health. These may include imaging tests like MRIs and CT scans, or direct visualization techniques such as laryngoscopy. In cases where vocal cord movement needs to be assessed, a videostroboscopy is often employed to view the cords while they are vibrating.
Treatment Strategies
Treatment varies depending on the severity and type of disorder. Minor issues like acute laryngitis may only require rest and hydration, while more severe conditions like laryngeal cancer may necessitate chemotherapy, radiation, or surgery. For individuals who have had their larynx removed (laryngectomy), communication can still be achieved through specialized speech therapy or devices like an electrolarynx.
Care and Prevention
Maintaining a healthy larynx is largely dependent on lifestyle choices and protective habits. Avoiding tobacco products and limiting alcohol consumption are the most effective ways to reduce the risk of laryngeal cancer. Additionally, staying hydrated and avoiding vocal strain, such as shouting for extended periods, helps protect the delicate vocal folds from injury.
If you experience persistent hoarseness, a sore throat, or difficulty swallowing for more than two weeks, it is recommended to consult a healthcare professional for a thorough evaluation.
Frequently Asked Questions
1. What is the larynx?
The larynx is a hollow tube in the neck that connects the throat to the windpipe, facilitating breathing and sound production.
2. Why is the larynx called the voice box?
It is called the voice box because it contains the vocal cords, which vibrate to produce sound for speech.
3. Where is the larynx located?
It is located in the middle of the neck, situated just above the trachea (windpipe) and the esophagus.
4. What are the three parts of the larynx?
The larynx is divided into the supraglottis (top), the glottis (middle), and the subglottis (bottom).
5. What does the epiglottis do?
The epiglottis is a flap that covers the windpipe during swallowing to prevent food and liquid from entering the lungs.
6. What causes laryngitis?
Laryngitis is typically caused by viral infections, vocal strain from overusing the voice, or irritants like smoke and acid reflux.
7. How long does laryngitis usually last?
Acute laryngitis usually resolves within a week or two, but chronic laryngitis can last for more than three weeks.
8. What are vocal cord nodules?
Nodules are noncancerous growths that develop on the vocal cords, often due to chronic vocal strain or overuse.
9. Can you develop cancer in the larynx?
Yes, laryngeal cancer can occur in any part of the voice box, often linked to long-term tobacco and alcohol use.
10. What is a laryngoscopy?
A laryngoscopy is a medical procedure where a doctor uses a specialized scope to examine the inside of the larynx.
11. What are the symptoms of vocal cord paralysis?
Symptoms include a weak or breathy voice, hoarseness, and sometimes difficulty breathing or swallowing.
12. How can I protect my voice?
You can protect your voice by staying hydrated, avoiding smoking, and not straining your vocal cords by shouting.
13. Can someone speak without a larynx?
Yes, through specialized speech therapy or the use of an electrolarynx device, individuals can learn new ways to communicate.
14. When should I see a doctor for voice changes?
If hoarseness or voice changes persist for more than two weeks, you should seek a medical evaluation.
15. What is the size of the human larynx?
The adult human larynx is approximately 4 to 5 centimeters in both length and width.
Related Reading
References
Medical Disclaimer: This content is for informational purposes only and does not constitute medical advice. Always seek the guidance of a qualified healthcare professional regarding any medical condition or treatment.
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