An instructional training manikin comprising a body including a torso, legs, arms and a head. Interchangeable male and female breasts are detachably connectible to the body. Male and female genitalia are also respectively connected to the body whereby the body can be converted between male and female model. The torso is hollow and includes fluid reservoirs therein connected to openings in the body to permit flow of fluid to and from the reservoirs for simulating various body functions and treatments. A soft flexible cover is detachably connected on the body at least to cover the female breasts and provide simulated appearance and touch of normal and diseased female breasts. A flexible buttocks simulating cover is detachably connectible to the body at the lower posterior wall thereof. The buttocks simulating cover has an aperture which registers with an anal opening in the body. The interior of the body is provided with a wall on which plates carrying normal and diseased prostate models can be attached. The body is provided with an anal aperture through which palpation of the prostate models can be effected.
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