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Nerve fibers innervating most of the palate and pharynx From Wikipedia, the free encyclopedia
The pharyngeal plexus is a nerve plexus located upon the outer surface of the pharynx. It contains a motor component (derived from the vagus nerve (cranial nerve X)), a sensory component (derived from the glossopharyngeal nerve (cranial nerve IX)), and sympathetic component (derived from the superior cervical ganglion).[1]
Pharyngeal plexus of vagus nerves | |
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Details | |
Identifiers | |
Latin | plexus pharyngeus nervi vagi |
TA98 | A14.2.01.159 |
TA2 | 6338 |
FMA | 6236 |
Anatomical terms of neuroanatomy |
The plexus provides motor innervation to most muscles of the soft palate (all but the tensor veli palatini muscle) and most muscles of the pharynx (all but the stylopharyngeus muscle).[1] The larynx meanwhile receives motor innervation from the vagus nerve (CN X) via its external branch of the superior laryngeal nerve and its recurrent laryngeal nerve, and not through the pharyngeal plexus.[citation needed]
The pharyngeal plexus occurs upon the outer surface of the pharynx - especially superficial to the middle pharyngeal constrictor muscle.[1]
It has the following components:[2]
Because the cranial part of accessory nerve (CN XI) leaves the jugular foramen as a part of the CN X, it is sometimes considered part of the plexus as well.[2]
En route to their target tissues, outgoing fibres from the pharyngeal plexus at first either ascend upon the superior pharyngeal constrictor muscle or descend upon the inferior pharyngeal constrictor muscle, then ramify within the pharyngeal muscular layer and mucous membrane.[1]
The pharyngeal plexus, with fibers from CN IX, CN X, and cranial part of CN XI, innervates all the muscles of the pharynx (except stylopharyngeus, which is innervated directly by a branch of CN IX).[dubious – discuss][citation needed]
This includes the following muscles: palatopharyngeus, palatoglossus, musculus uvulae, the pharyngeal constrictors, salpingopharyngeus plus others.[citation needed]
The pharyngeal plexus provides sensory innervation to most of the pharynx;[1] it provides sensory innervation to the oropharynx and laryngopharynx from CN IX and CN X. (The nasopharynx above the pharyngotympanic tube and the torus tubarius is innervated by CN V2).[citation needed]
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