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The thyroid cartilage forms the bulk of the front wall of the larynx. It protects the vocal folds ("vocal cords"), which are located directly behind it. When the angle of the thyroid cartilage changes relative to the cricoid cartilage, this changes the pitch of voice. The cartilage also serves as an attachment for several muscles.
The cricothyroid ligament is named after the two structures it connects: the cricoid cartilage and the thyroid cartilage. It is also known as the cricothyroid membrane, and the cricovocal membrane. [3] The various parts of the cricothyroid ligament have been named in many different ways, which can cause confusion.
The thyroid, or thyroid gland, is an endocrine gland in vertebrates. In humans, it is a butterfly-shaped gland located in the neck below the Adam's apple. It consists of two connected lobes. The lower two thirds of the lobes are connected by a thin band of tissue called the isthmus (pl.: isthmi).
The Adam's apple, in relation with the thyroid cartilage which forms it, helps protect the walls and the frontal part of the larynx, including the vocal cords (which are located directly behind it). [4] Another function of the Adam's apple is related to the deepening of the voice.
The thyrohyoid membrane is attached below to the upper border of the thyroid cartilage and to the front of its superior cornu, and above to the upper margin of the posterior surface of the body and greater cornu of the hyoid bone. [1] It passes behind the posterior surface of the body of the hyoid.
[3] [5] They draw up the arch of the cricoid cartilage and tilt back the upper border of the cricoid cartilage lamina. [3] [5] The distance between the vocal processes and the angle of the thyroid is increased, elongating [3] and thus tensing the vocal folds, [1] thereby resulting in higher pitch phonation. [3]
The cricothyroid joint (or articulation) is a joint connecting the cricoid cartilage and the thyroid cartilage.It plays a key role in adjusting human voice pitch by changing the tension of the vocal cords.
The vocal folds are located within the larynx at the top of the trachea. They are attached at the back to the arytenoid cartilages , and at the front to the thyroid cartilage via Broyles ligament. They are part of the glottis .