The reproductive organs of the stallion include not only the anatomical structures previously described, but also structures within the brain. The organs of copulation, spermatozoan production and passage to the exterior may be referred to as the intrinsic reproductive organs and those within the brain as the extrinsic organs. It is the extrinsic organs that largely control the intrinsic organs and ensure that the reproductive system does not work in isolation, but in harmony with other bodily functions and control mechanisms. These extrinsic organs form the basis of the following discussion on the control of stallion reproduction.
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