The image on the left is of the bulb of the penis with the retractor penis muscle covering the bulbospongiosus muscle. The Cowper's glands are seen at the top.

If you have this portion as above, flip it over to see something similar to the right image. Here you can see the crus penis which is paired. The arterial blood vessels that supply the penis for erection enter through the crus penis. The crus penis on each side then fuse to form the corpus cavernosum. During the erection process, the ischiocavernosus muscle contracts intermittently to force arterial blood in through the crus penis and increase the pressure within the corpus cavernosum.

This is the end of boar anatomy.