Which fascia forms the anterior boundary of the retropharyngeal space?

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The retropharyngeal space sits behind the pharynx and in front of the prevertebral fascia. The boundary that forms its front wall is the buccopharyngeal fascia, the visceral layer that covers the pharynx and esophagus. This fascia separates the pharyngeal wall from the deeper spaces behind it, defining the anterior limit of the retropharyngeal space. The other fascial layers listed don’t form this anterior boundary: the prevertebral fascia is behind the space, the investing fascia is superficial around the neck, and the pharyngomaxillary fascia isn’t a standard boundary for this space.