Fig. 5.

Sections through the glans penis of three individual specimens illustrating the clefts (large arrows) in the MUMP ridge. In all cases the prominent ventral cleft is open into the preputial space. Minor clefts penetrate from the penile surface into the incipient urethral lumen in dorsal-lateral positions adjacent to the MUMP whose core contains cartilage. In all specimens, minor clefts demarcate separate processes, which in more proximal sections fuse with adjacent structures (MUMP or other processes constituting the MUMP ridge) to complete the MUMP ridge. Note in (b and c) minor clefts, which penetrate from the exterior and end blindly within the substance of the MUMP ridge in the 3 to 4 o'clock positions. Scale bar = 250 μm for a and b and 100 μm for c.