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Reference.org
Vocal tract
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<p>The vocal tract is the cavity in human bodies and in animals where the sound produced at the sound source (<a href="/facts/Larynx/0bhtXI3Q">larynx</a> in mammals; <a href="/facts/Syrinx_(biology)/INRhzG7D">syrinx</a> in birds) is filtered. </p><p>In <a href="/facts/Birds/RJF6zwLP">birds</a>, it consists of the <a href="/facts/Vertebrate_trachea/zMSEwjAy">trachea</a>, the <a href="/facts/Syrinx_(biology)/INRhzG7D">syrinx</a>, the oral cavity, the upper part of the <a href="/facts/Esophagus/XWa7WoWn">esophagus</a>, and the <a href="/facts/Beak/ogF79j48">beak</a>. In <a href="/facts/Mammals/phSwTzBo">mammals</a>, it consists of the <a href="/facts/Laryngeal_cavity/qbJjhwr4">laryngeal cavity</a>, the <a href="/facts/Pharynx/51F3eVms">pharynx</a>, the oral cavity, and the <a href="/facts/Nasal_cavity/N82Yw4LR">nasal cavity</a>. </p><p>The estimated average length of the vocal tract in men is 16.9 cm and 14.1 cm in women. </p>