Vocal cords contain the vocal tract (the muscles that vibrate the vocal folds), an alveoli (the air passages in the vocal folds), and the vocal tract wall (the wall of the vocal folds). All of these structures are important to sound communication.
Vocal cords form from cells of the epidermis (the body of the skin that covers the inside of the body). The epithelium (the outermost layer of the skin) is very different from the rest of the epidermis: it is the most densely packed part and contains cells with a greater number of surface receptors. Because it was the epithelium that gave up its natural role of protecting the vocal folds and vocal folds from injury, it is believed that the vocal cords will react differently in children and adults of different ages and shapes.
Vocal cords form in the middle ear, at or near the roof of the mouth, in the middle ear canal, between the eardrum and the inner part of the cochlea. They can also form in the larynx (voice box), larynx or oropharynx, or in the upper airway (throat).
In humans, vocal cords are usually divided into two types: a thin and wide type called the vocal folds (also called articulations).
The thin type of vocal cord is a kind of cord with short cords and no muscle at its base. Because it lacks muscle, it is called a vocal fold. The thin-voiced cord is more commonly called a voicebox chord. The wide-voiced cord is a kind of vocal cord with longer cords and many muscles at its base. It is called a vocal tract chord. The large vocal tract is a kind of vocal cord that is part of a body’s vocal tract but not part of a vocal cord.
The thin sound-giving vocal cords are not always used, whereas the broad vocal cord is often found most commonly in children and in adults or animals. The wide vocal cords are more commonly found in people and animals. When the voicebox chord does not exist, the voicebox chord becomes the voice box.
Vocal cords are usually divided into the four basic parts: the vocal folds and vocal tract (the vocal tract wall), pharynx (voice box), and larynx (voice chamber). Most of the voice is made up of the narrow vocal cords. Voice boxes are divided into vocal cords and vocal cords.
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