Published on: July 2026
By: Lovejeet Singh, Biotome
Introduction
Hello friends! 👋
Have you ever wondered how you're able to speak, sing, laugh, whisper, or even swallow food without it entering your lungs?
The answer lies in a remarkable group of muscles called the laryngeal muscles. Although these muscles are small, they perform some of the most important jobs in the human body. Every word you speak, every deep breath you take, and every swallow you make depends on the perfect coordination of these muscles.
The laryngeal muscles control the movement of the larynx (voice box) and the vocal folds (vocal cords). They open the airway for breathing, close it during swallowing, and adjust the tension of the vocal cords to produce different sounds and voice pitches.
In this complete guide, you'll learn the anatomy, types, functions, nerve supply, blood supply, clinical importance, and interesting facts about the laryngeal muscles in a simple and easy-to-understand way.
💡 My Experience
When I first started learning anatomy, I thought the vocal cords alone were responsible for producing sound. Later, I discovered that the vocal cords cannot move by themselves—they rely entirely on the laryngeal muscles.
Once I understood how these muscles coordinate breathing, speech, and swallowing, the entire process became much easier to understand. If you're studying anatomy, medicine, nursing, physiotherapy, or simply curious about the human body, mastering the laryngeal muscles will help you understand many other topics, including respiration and voice production.
What Are the Laryngeal Muscles?
The laryngeal muscles are specialized skeletal muscles that move the cartilages of the larynx and control the position and tension of the vocal folds.
These muscles make it possible to:
Speak
Whisper
Sing
Breathe normally
Swallow safely
Cough effectively
Without these muscles, humans would be unable to communicate normally or protect the airway during swallowing.
Where Are the Laryngeal Muscles Located?
The laryngeal muscles are located in the front of the neck, inside and around the larynx, which lies between the pharynx and the trachea.
The larynx is supported by several cartilages, including:
Thyroid cartilage
Cricoid cartilage
Arytenoid cartilages
Epiglottis
Corniculate cartilages
Cuneiform cartilages
The muscles attach to these cartilages and move them in different directions.
Types of Laryngeal Muscles
The laryngeal muscles are divided into two main groups.
| Muscle Group | Primary Function |
|---|---|
| Intrinsic Muscles | Move the vocal cords and control the opening of the airway |
| Extrinsic Muscles | Move the entire larynx upward or downward |
The intrinsic muscles are mainly responsible for voice production, while the extrinsic muscles help during swallowing and speech.
Intrinsic Laryngeal Muscles
These muscles are located completely within the larynx.
1. Posterior Cricoarytenoid Muscle
This is one of the most important muscles in the respiratory system.
Functions
Opens the vocal folds
Widens the airway
Allows air to enter the lungs
It is the only muscle that abducts (opens) the vocal cords.
Without this muscle, normal breathing would be impossible.
2. Lateral Cricoarytenoid Muscle
Functions
Closes the vocal folds
Helps produce speech
Protects the airway during swallowing
3. Cricothyroid Muscle
This muscle stretches and tightens the vocal folds.
Functions
Produces high-pitched sounds
Adjusts voice pitch
Increases vocal cord tension
It is especially active while singing high notes.
4. Thyroarytenoid Muscle
Functions
Relaxes the vocal folds
Produces lower-pitched sounds
Helps regulate voice quality
5. Vocalis Muscle
This muscle lies alongside the vocal ligament.
Functions
Makes fine adjustments to vocal cord tension
Produces smooth speech
Helps control subtle changes in voice
6. Transverse Arytenoid Muscle
Functions
Brings the arytenoid cartilages together
Closes the back portion of the vocal folds
Helps prevent food from entering the airway
7. Oblique Arytenoid Muscle
Functions
Assists the transverse arytenoid
Narrows the entrance of the larynx
Protects the airway during swallowing
Extrinsic Laryngeal Muscles
These muscles connect the larynx to nearby bones.
Examples include:
Digastric
Stylohyoid
Mylohyoid
Geniohyoid
Sternohyoid
Omohyoid
Sternothyroid
Thyrohyoid
Main Functions
Elevate the larynx during swallowing
Lower the larynx after swallowing
Stabilize the voice box
Assist speech
How the Laryngeal Muscles Work
During Breathing
Posterior cricoarytenoid muscles contract.
Vocal folds move apart.
Air passes freely into the lungs.
During Speaking
Lateral cricoarytenoid muscles close the vocal folds.
Air from the lungs passes through the narrow opening.
Vocal folds vibrate.
Sound is produced.
The tongue, lips, and mouth shape the sound into speech.
During Swallowing
The larynx moves upward.
The epiglottis folds over the airway.
Food enters the esophagus instead of the trachea.
This mechanism prevents choking.
Nerve Supply
Nearly all intrinsic laryngeal muscles receive motor supply from the:
Recurrent Laryngeal Nerve
A branch of the vagus nerve (Cranial Nerve X).
It supplies:
Posterior cricoarytenoid
Lateral cricoarytenoid
Thyroarytenoid
Vocalis
Arytenoid muscles
Cricothyroid Muscle
The cricothyroid is the exception.
It receives motor supply from the:
External branch of the Superior Laryngeal Nerve
Blood Supply
The laryngeal muscles receive blood mainly from:
Superior laryngeal artery
Inferior laryngeal artery
These arteries are branches of the superior and inferior thyroid arteries.
Lymphatic Drainage
Lymph from the larynx drains into:
Deep cervical lymph nodes
Prelaryngeal lymph nodes
Paratracheal lymph nodes
This is clinically important in infections and cancers of the larynx.
Functions of the Laryngeal Muscles
| Function | Description |
|---|---|
| Voice Production | Controls vocal fold movement |
| Breathing | Opens the airway |
| Swallowing | Protects the airway |
| Coughing | Helps clear the respiratory tract |
| Voice Pitch | Produces high and low sounds |
| Airway Protection | Prevents food aspiration |
| Speech | Enables communication |
Clinical Importance
Several medical conditions affect the laryngeal muscles.
Vocal Cord Paralysis
Occurs when the recurrent laryngeal nerve is damaged.
Symptoms include:
Hoarseness
Weak voice
Difficulty breathing
Difficulty swallowing
Laryngitis
Inflammation of the larynx.
Symptoms:
Hoarse voice
Sore throat
Pain while speaking
Spasmodic Dysphonia
A neurological disorder causing involuntary muscle spasms.
Speech becomes strained and interrupted.
Recurrent Laryngeal Nerve Injury
May occur during:
Thyroid surgery
Neck trauma
Tumors
This can result in voice loss.
Laryngeal Cancer
Cancer may affect the muscles and surrounding tissues, causing:
Persistent hoarseness
Difficulty swallowing
Chronic cough
Breathing problems
Comparison Table
| Intrinsic Muscles | Extrinsic Muscles |
|---|---|
| Inside the larynx | Outside the larynx |
| Move vocal folds | Move entire larynx |
| Voice production | Swallowing support |
| Fine airway control | Position the larynx |
Quick Summary Table
| Feature | Details |
|---|---|
| Organ | Larynx |
| Number of Main Intrinsic Muscles | 7 |
| Main Nerve | Recurrent Laryngeal Nerve |
| Exception | Cricothyroid Muscle |
| Main Function | Voice, breathing & swallowing |
| Primary Cranial Nerve | Vagus Nerve (CN X) |
💡 My Recommendation
If you're preparing for NEET, MBBS, Nursing, BPT, Anatomy practicals, or other medical entrance exams, don't try to memorize all the muscles at once.
Instead:
Learn the cartilages of the larynx first.
Study each muscle one by one.
Understand what movement each muscle performs.
Finally, learn the nerve supply.
This step-by-step approach makes the topic much easier to remember.
💡 Pro Tip
An easy way to remember an important fact is:
"Posterior Cricoarytenoid = Only Opener of the Vocal Cords."
This is one of the most frequently asked facts in anatomy and medical examinations.
⚠️ Note
Damage to the recurrent laryngeal nerve during thyroid surgery can cause permanent hoarseness or vocal cord paralysis. Because of this, surgeons carefully identify and protect this nerve during neck operations.
Common Beginner Mistakes
Many students make these mistakes while learning the laryngeal muscles:
Confusing laryngeal muscles with pharyngeal muscles
Thinking all muscles are supplied by the same nerve (the cricothyroid is an exception)
Forgetting that the posterior cricoarytenoid is the only muscle that opens the vocal cords
Assuming the vocal cords create sound on their own without muscle control
Mixing up intrinsic and extrinsic muscle functions
Interesting Facts
The laryngeal muscles work every time you speak, laugh, cough, or swallow.
The posterior cricoarytenoid is often called the "safety muscle of the larynx" because it keeps the airway open.
Professional singers have exceptionally well-controlled laryngeal muscles.
The vocal folds can vibrate hundreds of times per second during speech.
Even whispering requires coordinated activity of the laryngeal muscles.
These muscles continue working automatically while you breathe during sleep.
The larynx is sometimes called the "guardian of the airway" because it prevents food from entering the lungs.
Conclusion
The laryngeal muscles are a remarkable group of skeletal muscles that make breathing, speaking, swallowing, and protecting the airway possible. Although they are small, they perform highly coordinated movements every second of the day.
Understanding these muscles not only improves your knowledge of human anatomy but also helps explain many common medical conditions affecting the voice and airway. Whether you're a medical student, healthcare professional, or simply curious about the human body, learning the laryngeal muscles provides a strong foundation for understanding the respiratory and vocal systems.
I hope this guide made the topic simple and enjoyable to learn. Keep exploring anatomy—one topic at a time—and you'll soon discover just how amazing the human body truly is.
Frequently Asked Questions (FAQs)
1. What are the laryngeal muscles?
The laryngeal muscles are muscles that control the movement of the larynx and vocal folds, allowing breathing, speech, and swallowing.
2. How many intrinsic laryngeal muscles are there?
There are seven major intrinsic laryngeal muscles, each performing a specific function in voice production and airway control.
3. Which muscle opens the vocal cords?
The posterior cricoarytenoid muscle is the only muscle that abducts (opens) the vocal cords during breathing.
4. Which nerve supplies most laryngeal muscles?
Most intrinsic laryngeal muscles are supplied by the recurrent laryngeal nerve, a branch of the vagus nerve (Cranial Nerve X).
5. Which muscle is supplied by the superior laryngeal nerve?
The cricothyroid muscle is supplied by the external branch of the superior laryngeal nerve.
6. Why are the laryngeal muscles important?
They allow us to breathe, speak, sing, swallow safely, cough effectively, and protect the airway from food and liquids.
7. What happens if the recurrent laryngeal nerve is damaged?
Damage may lead to hoarseness, vocal cord paralysis, difficulty speaking, swallowing problems, and in severe cases, breathing difficulties.
