Fig. 1

Sectional anatomy of the penis. Anatomical illustration of the penis in the axial plane of the shaft (left) and in the parasagittal plane (right) (a). The ultrasound anatomy of the non-erect penis is shown (b, c) in slices equivalent to those shown in a. The corpus spongiosum is in a ventral position (asterisks *), partially collapsed by the weight of the transducer. The corpus spongiosum forms the glans at the distal end of the penis, as seen in the longitudinal view (c). The corpora cavernosa (stars) are in a dorsal position. They are all surrounded by a hyperechogenic layer: the tunica albuginea, whose cavernous component is indicated by arrowheads. The arrow indicates the course of the cavernous artery of the penis, which runs in the centre of the corpus cavernosum