Plate, internal membrane, muscular structure, and strictured part of the urethra by Franz Bauer Plate XXIII containing four figures showing the internal membrane, the surrounding muscular structure, and the strictured part of the urethra. Subject: Anatomy Published in Philosophical Transactions as 'Observations on the human urethra, showing its internal structure, as it appeared in the microscope of F. Bauer, Esq'. Read 1 June 1820. [1820]