Definition

Noun: - Ninth cranial nerve: A paired nerve that is the ninth of twelve cranial nerves. It is a mixed nerve, containing both sensory (afferent) and motor (efferent) fibers. - Sensory and motor functions: It provides sensory innervation to the back of the tongue (including taste for the posterior one-third), the pharynx (throat), and the middle ear. Its motor fibers control muscles involved in swallowing (elevating the pharynx and larynx). - Parasympathetic component: It carries parasympathetic fibers that stimulate saliva production from the parotid gland.

Usage Examples

• Noun:
  • Damage to the glossopharyngeal nerve can result in difficulty swallowing and loss of taste sensation at the back of the tongue.
  • The neurologist tested the function of the patient's glossopharyngeal nerve by checking the gag reflex.
  • The glossopharyngeal nerve emerges from the medulla oblongata in the brainstem.

Advanced Usage

• "Glossopharyngeal neuralgia": A condition characterized by severe, sharp, stabbing pain in the areas innervated by the glossopharyngeal nerve, such as the back of the throat, tongue, and ear.
  • The patient was diagnosed with glossopharyngeal neuralgia after experiencing recurrent, excruciating throat pain.

Variants and Related Words

• Cranial Nerve IX: The anatomical numerical designation for the glossopharyngeal nerve.
• Nervus glossopharyngeus: The Latin anatomical term.

Synonyms

• Ninth cranial nerve: The primary synonymous term used in anatomical and clinical contexts.

Related Phrases and Concepts

• Gag reflex: A protective reflex mediated in part by the sensory input of the glossopharyngeal nerve.
• Parasympathetic innervation: Refers to the nerve's role in carrying "rest-and-digest" signals to the parotid salivary gland.

Noun

1. sensory nerve to the pharynx and back of the tongue; motor fibers innervate muscles that elevate the pharynx and larynx; includes parasympathetic fibers to the otic ganglion