Tumours of the hypopharynx
نویسنده
چکیده
The definition of these sites is shown in Table 13.1. The larynx projects into the hypopharynx from the front so that grooves, known as the pyriform fossae, are formed on either side. These are shallow above and are separated from the valleculae by the pharyngoepiglottic folds. Lower down, the pyriform fossae become deeper. The upper shallow part of the pyriform fossa is bounded laterally by the thyrohyoid membrane and medially by the aryepiglottic fold. The lower deeper part of the fossa is related laterally to the thyroid cartilage. An important inferior relation is the paraglottic space which is the potential space bounded by the thyroid ala laterally and the conus elasticus and the quadrangular membrane medially: tumours passing through the aryepiglottic fold easily gain entrance to this space and then pass inferiorly lateral to the vocal cord. The pyriform fossae are lined by squamous epithelium, with a rich underlying network of lymphatics. These drain upwards with the superior laryngeal pedicle to the upper deep cervical nodes.
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