Categories FAQ

What is the function of the Cricothyroid muscle?

Function. The cricothyroid muscle produces tension and elongation of the vocal cords. They draw up the arch of the cricoid cartilage and tilt back the upper border of the cricoid cartilage lamina.

What happens if cricothyroid muscle is damaged?

Damage to this nerve results in an inability to attain the high registers of voice and singing, impaired pitch regulation, and vocal weakness or fatigue, although a normal speaking voice is often present.

What does the cricothyroid muscle innervation?

The classical understanding of the anatomy is that the cricothyroid muscle (CTM) is innervated solely by the external branch of the superior laryngeal nerve (EBSLN), and the endolaryngeal muscles are covered only by the recurrent laryngeal nerve (RLN).

What does the posterior cricothyroid muscle do?

The posterior cricoarytenoid muscles are the only muscles to open the vocal cords. By rotating the arytenoid cartilages laterally, these muscles abduct the vocal cords. This opens the rima glottidis.

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What happens when cricothyroid contracts?

When the cricothyroid muscle contracts, it pulls the thyroid cartilage downward and anteriorly, causing rotation about the cricothyroid joint. This narrows the space between the thyroid and cricoid cartilages, and moves the thyroid cartilage away from the arytenoid cartilage.

What happens when the external laryngeal nerve is damaged?

Damage to the laryngeal nerve can result in loss of voice or obstruction to breathing. Laryngeal nerve damage can be caused by injury, tumors, surgery, or infection. Damage to the nerves of the larynx can cause hoarseness, difficulty in swallowing or breathing, or the loss of voice.

What happens when the recurrent laryngeal nerve is damaged?

Injury to the recurrent laryngeal nerve has the potential to cause unilateral vocal cord paralysis. Patients with this typically complain of new-onset hoarseness, changes in vocal pitch, or noisy breathing.

What cranial nerve Innervates the cricothyroid?

The superior laryngeal nerve, a branch of the vagus nerve, innervates the cricothyroid muscle of the larynx. This muscle stretches, tenses, and adducts the vocal cord.

Which branch of the vagus nerve Innervates the cricothyroid muscle?

The superior laryngeal nerve innervates the two cricothyroid muscles.

What muscles does the recurrent laryngeal nerve innervate?

The recurrent laryngeal nerves control all intrinsic muscles of the larynx except for the cricothyroid muscle. These muscles act to open, close, and adjust the tension of the vocal cords, and include the posterior cricoarytenoid muscles, the only muscle to open the vocal cords.

What is the function of the posterior cricoarytenoid muscle?

The PCA muscle is located on the back of the larynx, behind and lateral to the arytenoid cartilage. It pulls on the arytenoid cartilage to open the vocal cords for breathing.

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Why is the posterior Cricoarytenoid important?

Function. Posterior cricoarytenoid muscle is the only muscle of the larynx that abducts the vocal cords and therefore opens the rima glottidis. This separates the vocal cords and assists the other intrinsic muscles in lengthening the vocal cords, therefore allowing the passage of air during inspiration and expiration.

How does the cricothyroid muscle change pitch?

The cricothyroid muscle, which rotates the major laryngeal cartilages, in turn passively stretches and tightens the vocal folds. As they lengthen and become stiffer, the fundamental frequency of vocal fold vibration increases and a higher-pitched sound is produced.

When the CTS contract what happens to the thyroid cartilage?

The thyroid cartilage pivots or rocks forward on top of the cricoid cartilage when the CT muscle contracts. The effect of this rocking is to stretch the vocal cords, thus the function of the CT muscle can be viewed indirectly.

Which muscle shortens the vocal folds when contracting?

Anatomical terms of muscle The thyroarytenoid muscle is a broad, thin muscle that forms the body of the vocal fold and that supports the wall of the ventricle and its appendix. It functions to shorten the vocal folds.

What happens when the glottis is closed?

The narrowed glottis that Abercrombie refers to is meant to account for ‘whisper,’ (Film clip 3) which is noisier than ‘breath,’ and the closed glottis refers to the state known as a ‘glottal stop,’ (Film clip 4) when the passage is closed, allowing no air (either breath or voiced flow) to pass through.

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