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dibular glands hyoid bone valleculae pyriform sinuses oropharynx intervallecular septum SCM carotids IJs sup cornu thyroid cart epiglottis s phar constr trapezius 第三層次 定位標(biāo)志 1 舌骨 nodal stations: 1a 1b 2a 2b 3 4 5 6 RP from back of SCM to front of trapezius, below top of hyoid ends at TOP of hyoid all END at bottom of hyoid platysma SCM strap mm thyroid cart int jugulars carotids vertebrals pharyngeal constrictor pyriform sinuses laryngopharynx periglottic fat preepiglottic fat aryepiglottic folds ext jugulars 第四層次 定位標(biāo)志 1甲狀軟骨 2會厭前間隙 nodal stations: 1a 1b 2a 2b 3 4 5 6 RP (