Trachea

(tra-ke'-ah, or tra'-ke-ah). The X 15. (From The Trachea. 2. Section through cartilages. windpipe. A cartilaginous and mem' branous cylindvic tube extending from the lower part of the larynx to its division into the two bronchi. It is about four and a half inches in length. In biology: (a) One of the branched respiratory tubes of an arthropod; these tracheal tubes first appear in Myriapod a;. T., Book-leaf, a respiratory organ found in the A rach no idea, and consisting of a sac filled with air, into which there project from the anterior wall numerous leaves arranged like those of a book.