Salpingopharyngeus muscle

Salpingopharyngeus muscle is a small muscle located in the pharynx, part of the human body's pharyngeal apparatus. It plays a crucial role in the functioning of the Eustachian tube and in swallowing. This muscle is often overlooked but is essential for the proper physiological functioning of the upper respiratory and digestive systems.

Anatomy

The Salpingopharyngeus muscle originates from the cartilaginous part of the Eustachian tube, also known as the auditory tube or pharyngotympanic tube. From its origin, the muscle extends downward, blending with the fibers of the palatopharyngeus muscle and inserting into the posterior border of the thyroid cartilage and the pharyngeal wall. It is innervated by the pharyngeal plexus of the vagus nerve (CN X), which provides the motor supply necessary for its function.

Function

The primary function of the Salpingopharyngeus muscle is to aid in the opening of the Eustachian tube during swallowing and yawning. This action helps equalize the pressure between the middle ear and the atmosphere, which is crucial for proper hearing. Additionally, by participating in the elevation of the pharynx and larynx during swallowing, it contributes to the efficient passage of food and liquid from the mouth to the esophagus.

Clinical Significance

Dysfunction or paralysis of the Salpingopharyngeus muscle can lead to difficulties in swallowing (dysphagia) and a sensation of ear fullness due to the inability to properly open the Eustachian tube. This can result in chronic middle ear infections (otitis media) and potential hearing loss if not addressed. The assessment of this muscle's function is part of a comprehensive evaluation of pharyngeal muscles in patients presenting with dysphagia or auditory tube dysfunction.

See Also

• Pharyngeal muscles
• Eustachian tube
• Swallowing
• Vagus nerve