Within the trachea.
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en·do·tra·che·al -'trā-kē-əl adj
1) placed within the trachea
2) applied or effected through the trachea <\endotracheal anesthesia> <\endotracheal intubation>
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adj.
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en·do·tra·che·al (en″do-traґke-əl) [endo- + tracheal] 1. within or through the trachea. 2. performed by passage through the lumen of the trachea.Medical dictionary. 2011.