What is the origin of the thyroarytenoid muscle?
Thyroarytenoid muscle
| Origin | Angle of thyroid cartilage and adjacent cricothyroid ligament |
|---|---|
| Insertion | Anterolateral surface of arytenoid cartilage |
| Action | Draws arytenoid cartilages anteriorly, Relaxes vocal ligament (for low pitch sound) |
| Innervation | Inferior laryngeal nerve (of recurrent laryngeal nerve (CN X)) |
What does the thyroepiglottic do?
Anatomical terms of muscle They have received a distinctive name, thyroepiglotticus or thyroepiglottic muscle, and are sometimes described as a separate muscle. This muscle’s function is to widen the laryngeal inlet.
What process does the Thyrovocalis muscle attach to?
The thyroarytenoid muscles lie beneath the vocal folds and attach the posterior aspect of the thyroid cartilage to the vocal process of the arytenoid cartilages.
Where are the Thyroarytenoids?
The thyroarytenoid muscles run from a vertical line on the interior surface of the thyroid cartilage angle and adjacent to the external surface of the cricothyroid ligament to the anterolateral surface of the arytenoid cartilage. Each muscle consists of 2 parts: the vocalis and thyroepiglottic part.
Is the Vocalis muscle the vocal folds?
Vocalis is a paired intrinsic laryngeal muscle, which sits parallel to the vocal ligament. Together with the vocal ligament, this muscle is the main component of the vocal cords or vocal folds. The vocal folds form the anterolateral edges of the rima glottidis and are concerned with sound production.
Where do the vocal folds originate?
Vocal folds (true vocal cords) The vocal folds also contain muscle fibers originating from the vocalis part of the thyroarytenoid muscle, which lies deep and inferior, parallel with the vocal ligament to which it is attached at the posterior end. The main function of the muscle is fine tonal control of the vocal cords.
What Innervates the Thyroepiglottic muscle?
n. A muscle with origin from the inner surface of the thyroid cartilage, in common with the thyroarytenoid muscle, insertion into the epiglottis, with nerve supply from the recurrent laryngeal nerve, and whose action depresses the base of the epiglottis.
What are the 5 layers of the vocal folds?
The vocal fold comprises five layers (deep to superficial layers as follows): thyroarytenoid muscle, deep lamina propria, intermediate lamina propria, superficial lamina propria, and the squamous epithelium.
Where do the vocal folds attach?
The vocal cords are composed of mucous membrane infoldings that stretch horizontally across the middle laryngeal cavity. They are attached anteriorly at the angle on the interior surface of the thyroid cartilage and project posteriorly to the arytenoid cartilages on either side.
What are the parts of larynx?
The internal space of the larynx is wide in the superior and inferior parts but narrows in the middle, forming a section named glottis, and dividing all the spaces into three sections: supraglottic, glottis, and infraglottic. The vocal cords, the glottis, and the larynx ventricles comprise the glottic space.
What is the origin of the vocal folds?
Vocalis muscle
| Origin | Lateral surface of vocal processes of arytenoid cartilage |
|---|---|
| Insertion | Anterior part of ipsilateral vocal ligament |
| Action | Tenses anterior part and relaxes posterior part of vocal ligament |
| Innervation | Recurrent laryngeal nerve, external laryngeal nerve |
| Blood supply | Superior and inferior thyroid artery |
Where do vocal folds originate?
Where does the thyroarytenoid muscle originate?
Thyroarytenoid muscle arises from the inner surface of the inferior part of thyroid cartilage, near the midline, as well as cricothyroid ligament. Its fibers pass posterolaterally to insert into the anterolateral surface of the arytenoid cartilage.
What is the origin of the oblique arytenoid?
Oblique arytenoid originates from the posterior aspect of the muscular process of arytenoid cartilage. The muscle extends obliquely towards its superiorly located insertion; the superior pole of the contralateral arytenoid cartilage. Along its path, the oblique arytenoid muscle crosses its pair from the opposite side, forming the letter “X”.
When does the oblique arytenoid act as a vocal fold adductor?
When the oblique arytenoid acts together with other vocal fold adductors (transverse arytenoid, lateral cricoarytenoid, thyroarytenoid) and vocal fold tensors ( cricothyroid, thyroarytenoid, vocalis ), the vocal folds are approximated (adductive tension) and the rima glottis is closed.
