The Pharynx A funnel-shaped muscular tube Extends from the base of the skull to C6 Lies behind Nasal cavities - Nasopharynx Oral cavity - Oropharynx Larynx - Laryngopharynx Inferiorly continues with esophagus
Blood Supply Branches from Arterial supply: Ascending pharyngeal a. Superior thyroid a. Ascending palatine from the Facial a. Greater palatine and pharyngeal Maxillary a. Venous drainage Pharyngeal venous plexus which drains into the internal jugular vein
Nerve Supply Sensory Nasopharynx - V2 Oropharynx – Glossopharyngeal nerve Laryngopharynx – Glossopharyngeal and vagus nerves (Internal and recurrent laryngeal nerves) Motor Allthe muscles are innervated by the vagus EXCEPT stylopharyngeus muscle which is supplied by the IX CN.
Nerve Supply Pharyngeal nerve plexus Formed by the pharyngeal branches of the Glossopharyngeal nerve Vagus nerve Sympathetic chain
Lymphatic drainage Retropharyngeal LN To the retropharyngeal LN and then to deep cervical LN Deep Cervical LN Directly to the deep cervical LN
Tonsils Four groups of submucous lymphoid collections. Pharyngeal Tonsil Palatine tonsil Tubal Tonsil Lingual Tonsil