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The human vocal cords are roughly 12 – 24 mm in length, and 3–5 mm thick. [9] Histologically, the human vocal cords are a laminated structure composed of five different layers. The vocalis muscle, main body of the vocal cords, is covered by the mucosa, which consists of the epithelium and the lamina propria. [10]
The human voice consists of sound made by a human being using the vocal tract, including talking, singing, laughing, crying, screaming, shouting, humming or yelling. The human voice frequency is specifically a part of human sound production in which the vocal folds (vocal cords) are the primary sound source.
The vibratory and viscoelastic characteristics of the human vocal cords are mainly attributed to the molecular composition of SLLPs. In normal vocal folds, the jelly-like "Reinke's space" is very loose and abundant with interstitial proteins such as hyaluronic acid , fibronectin, proteoglycan like fibromodulin, decorin and versican.
Grunting while lifting heavy objects is the result of some air escaping through the adducted vocal cords ready for phonation. [13] Abduction of the vocal cords is important during physical exertion. The vocal cords are separated by about 8 mm (0.31 in) during normal respiration, but this width is doubled during forced respiration. [13]
Vocal cord paresis, also known as recurrent laryngeal nerve paralysis or vocal fold paralysis, is an injury to one or both recurrent laryngeal nerves (RLNs), which control all intrinsic muscles of the larynx except for the cricothyroid muscle. The RLN is important for speaking, breathing and swallowing.
Vocal range plays such an important role in classifying singing voices into voice types that sometimes the two terms are confused with one another. A voice type is a particular kind of human singing voice perceived as having certain identifying qualities or characteristics; vocal range being only one of those characteristics.
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Vocal pedagogists may use the term vocal register to refer to any of the following: [2] A labeled anatomical diagram of the vocal folds or cords. a particular part of the vocal range such as the upper, middle, or lower registers; a resonance area such as chest voice or head voice; a phonatory process; a certain vocal timbre