Pouches of von Troeltsch
The anterior and posterior pouches of von Troeltsch (von Tröeltsch) are pouches within the middle ear formed by the space between the anterior and posterior malleolar folds and the tympanic membrane respectively. The posterior pouch of von Troeltsch is contiguous with Prussak’s space.
Prussak's space: chronological development and routes of aeration - ScienceDirect
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Duke Embryology - Craniofacial Development
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