From the case:
Male perineal muscles (Gray's illustration)
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![](https://prod-images-static.radiopaedia.org/images/56245195/Gray-square.006_big_gallery.jpeg)
Diagram of the perineal muscles in the male.
Case Discussion
Original diagram from Gray's anatomy, now out of copyright. This diagram has been reproduced from Gray's Anatomy 20th US edition which has now lapsed into the public domain (https://commons.wikimedia.org/wiki/File:Gray406.png).