[Morphology and function of the pharyngoesophageal segment]

Area of Science:

• Anatomy
• Neuroscience
• Histology

Context:

• The pharyngoesophageal segment (PES) plays a crucial role in swallowing and speech.
• Innervation by somatic, autonomic, and sympathetic nervous systems influences PES function.
• Degenerative processes in the cervical spine can affect sympathetic innervation.

Purpose:

• To review the anatomical structure, innervation, and histomorphology of the PES.
• To elucidate the impact of the nervous system on PES function and pressure.
• To explore the clinical significance of PES innervation for speech rehabilitation.

Summary:

• PES function is determined by its structure, nerve fiber distribution (IX, X, sympathetic trunk), and sphincter composition.
• Sympathetic stimulation alters pharyngeal sphincter tension, potentially impacting swallowing.
• Understanding PES innervation is vital for prognosis in esophageal and shunt speech after laryngectomy.

Impact:

• Provides insights into the etiopathogenesis of swallowing disturbances.
• Highlights the importance of neural pathways for pharyngeal muscle function.
• Informs clinical practice regarding speech rehabilitation strategies post-laryngectomy.