It is formed by the pharyngeal branches from the vagus and glossopharyngeal nerves and the cervical sympathetic 3-7. The pharyngeal plexus sends some branches between the middle and inferior constrictors and other branches between the superior and middle constrictors 4,6. It lies mainly over the middle pharyngeal constrictor muscle 4,5 although it spreads its branches over the dorsolateral surface of the both the superior and middle constrictors, and lower branches descend onto the inferior constrictor 6. The pharyngeal plexus lies within the external fascia of the pharynx 3 on the posterolateral wall of the pharynx in the retropharyngeal space 7. Relations: the pharyngeal plexus lies in the retropharyngeal space between the superior and middle constrictor muscles anteriorly and the longus capitus and colli muscles, prevertebral fascia, and bodies of the second and third cervical vertebrae posteriorly 7 and medial to the buccopharyngeal fascia 8 ![]() Supplies the superior, middle and inferior pharyngeal constrictor muscles, palatopharyngeus, salpingopharyngeus, levator veli palatini, palatoglossus and the muscle of the uvula 4,5 Origin and course: it is formed from the union of branches from the vagus nerve, glossopharyngeal nerve and cervical sympathetic nerves 4,5įilaments from the plexus ascend or descend external to the superior and inferior constrictors 5 before branching within the muscular layer and mucosa of the pharynx 4,5 Location: within the external fascia of the pharynx 3, mainly over the middle pharyngeal constrictor on the posterolateral wall of the pharynx 4
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