The pharyngeal plexus is a network of nerve fibers innervating most of the palate

Palate

The palate is the roof of the mouth in humans and other mammals. It separates the oral cavity from the nasal cavity. A similar structure is found in crocodilians, but, in most other tetrapods, the oral and nasal cavities are not truly separate. The palate is divided into two parts, the anterior...

, larynx

Larynx

The larynx , commonly called the voice box, is an organ in the neck of amphibians, reptiles and mammals involved in breathing, sound production, and protecting the trachea against food aspiration. It manipulates pitch and volume...

, and pharynx

Pharynx

The human pharynx is the part of the throat situated immediately posterior to the mouth and nasal cavity, and anterior to the esophagus and larynx. The human pharynx is conventionally divided into three sections: the nasopharynx , the oropharynx , and the laryngopharynx...

.

It is located on the surface of the middle pharyngeal constrictor muscle

Middle pharyngeal constrictor muscle

The middle pharyngeal constrictor is a fanshaped muscle, smaller than the Inferior pharyngeal constrictor muscle.-Origin and insertion:It arises from the whole length of the upper border of the greater cornu of the hyoid bone, from the lesser cornu, and from the stylohyoid ligament.The fibers...

.

Sources

Although the Terminologia Anatomica

Terminologia Anatomica

Terminologia Anatomica is the international standard on human anatomic terminology. It was developed by the Federative Committee on Anatomical Terminology and the International Federation of Associations of Anatomists and was released in 1998. It supersedes the previous standard, Nomina...

 name of the plexus has "vagus nerve" in the title, other nerves make contributions to the plexus.

It has the following sources:

• CN IX - pharyngeal branches of glossopharyngeal nerve
  Pharyngeal branches of glossopharyngeal nerve
  The pharyngeal branches of the glossopharyngeal nerve are three or four filaments which unite, opposite the Constrictor pharyngis medius, with the pharyngeal branches of the vagus and sympathetic, to form the pharyngeal plexus....
  
   - sensory
• CN X - pharyngeal branch of vagus nerve
  Pharyngeal branch of vagus nerve
  The pharyngeal branch of the vagus nerve, the principal motor nerve of the pharynx, arises from the upper part of the ganglion nodosum, and consists principally of filaments from the cranial portion of the accessory nerve....
  
   - motor
• superior cervical ganglion
  Superior cervical ganglion
  The superior cervical ganglion , the largest of the cervical ganglia, is placed opposite the second and third cervical vertebræ. It contains neurons that supply sympathetic innervation to the face....
  
   sympathetic fibers - vasomotor
  Vasomotor
  Vasomotor refers to actions upon a blood vessel which alter its diameter. More specifically, it can refer to vasodilator action and vasoconstrictor action....
  
  

Because the cranial part of accessory nerve (CN XI) leaves the jugular foramen

Jugular foramen

The jugular foramen is a large aperture in the base of the skull. It is located behind the carotid canal and is formed in front by the petrous portion of the temporal, and behind by the occipital; it is generally larger on the right than on the left side....

 along with CN IX and X, it is sometimes considered part of the plexus as well.

Sensory

The pharyngeal plexus provides sensory innervation of the oropharynx

Oropharynx

The Oropharynx reaches from the Uvula to the level of the hyoid bone.It opens anteriorly, through the isthmus faucium, into the mouth, while in its lateral wall, between the two palatine arches, is the palatine tonsil....

 and laryngopharynx from CN IX and CN X. (The nasopharynx

Nasopharynx

The nasopharynx is the uppermost part of the pharynx. It extends from the base of the skull to the upper surface of the soft palate; it differs from the oral and laryngeal parts of the pharynx in that its cavity always remains patent .-Lateral:On its lateral wall is the pharyngeal ostium of the...

 is innervated by CN V₂)

Motor

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).

This includes the following muscles: palatopharyngeus, palatoglossus, musculus uvulae

Musculus uvulae

The musculus uvulae is a muscle of the soft palate.-Origin and insertion:It arises from the posterior nasal spine of the palatine bones and from the palatine aponeurosis....

, the pharyngeal constrictor

Pharyngeal constrictor

Pharyngeal constrictor refers to one of the muscles that serves to constrict the pharynx.They include:* Superior pharyngeal constrictor muscle* Middle pharyngeal constrictor muscle* Inferior pharyngeal constrictor muscle...

s, salpingopharyngeus plus others.

Note that the intrinsic muscles of the larynx are innervated by the vagus nerve but not by the pharyngeal plexus. Instead, they are innervated by the recurrent laryngeal nerve

Recurrent laryngeal nerve

The recurrent laryngeal nerve is a branch of the vagus nerve that supplies motor function and sensation to the larynx . It travels within the endoneurium...

 and the external branch of the superior laryngeal nerve

Superior laryngeal nerve

The superior laryngeal nerve is a branch of the vagus nerve. It arises from the middle of the ganglion nodosum and in its course receives a branch from the superior cervical ganglion of the sympathetic....

, branches of the vagus.