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Topic

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Pharyngeal raphe

The pharyngeal raphe is a fibrous midline structure formed by the interlacing tendinous fibers of the superior, middle, and inferior pharyngeal constrictor muscles. It extends vertically from the basilar part of the occipital bone superiorly to the posterior surface of the cricoid cartilage inferiorly, forming the posterior attachment point for the pharyngeal constrictors. The raphe functions as a tensile support for coordinated contraction of the pharyngeal constrictors during swallowing, facilitating bolus propulsion into the esophagus and maintaining the posterior pharyngeal wall integrity.

The pharyngeal raphe is composed of dense collagen fibers, which provide mechanical strength, and serves as a central landmark in surgical procedures of the pharynx and posterior nasopharyngeal wall.

Function

  • Serves as the posterior attachment for superior, middle, and inferior pharyngeal constrictor muscles

  • Provides structural support to the posterior pharyngeal wall

  • Facilitates coordinated peristaltic contraction during swallowing

  • Maintains tensile integrity of pharyngeal musculature

  • Serves as a surgical landmark in posterior pharyngeal and oropharyngeal procedures

Synonyms

  • Posterior pharyngeal raphe

  • Pharyngeal midline fibrous seam

  • Pharyngeal fibrous raphe

MRI Appearance

T1-weighted images:

  • The pharyngeal raphe appears as a thin, linear low signal intensity (hypointense) structure along the posterior midline of the pharynx

  • Surrounded by intermediate signal intensity pharyngeal muscles and fat

  • Pathological changes (fibrosis, scarring, or inflammation) may show slightly altered signal along the raphe

T2-weighted images:

  • The raphe is low signal intensity (hypointense) due to dense fibrous collagen

  • Adjacent pharyngeal muscles appear intermediate signal, creating contrast

  • Useful for detecting midline tears, fibrosis, or inflammation

STIR (Short Tau Inversion Recovery):

  • Normal raphe remains low signal

  • Edema, inflammation, or scarring appears hyperintense, making STIR ideal for post-traumatic or post-surgical evaluation

T1 Post-Contrast (Gadolinium-enhanced):

  • Normal raphe shows minimal or no enhancement

  • Pathological raphe (inflamed, post-surgical, or scarred) may show focal enhancement along the midline

CT Appearance:

  • The raphe itself is not directly visible on conventional CT due to its fibrous nature

  • Its location is inferred as a midline seam posterior to the pharyngeal lumen

  • Surrounding soft tissues, pharyngeal constrictor muscles, and posterior pharyngeal wall are well-delineated, particularly with soft tissue window settings

  • CT is useful for evaluating posterior pharyngeal wall contour, masses, or post-surgical changes

MRI images

Pharyngeal raphe mri axial image -img-00000-00000

MRI images

Pharyngeal raphe

MRI images

Pharyngeal raphe sag image