Lab 1 - Image 5
The preputial muscle, which pulls the prepuce forward when the penis withdraws back into the prepuce, is derived from the cutaneus trunci muscle.
Left: Cutaneus trunci m., in which a hole is torn (asterisk), is evident as flat muscle fascicle bands (arrows). In the vicinity of the prepuce (1), muscle fascicles are thickened to form preputial m. (2).
Right: Skin has been reflected and the prepuce was incised to reveal the penis (3) and preputial orifice (4). Preputial muscle (5) is prominent deep to the skin.