Its main function is to lower and raise the scrotum, which helps to control the temperature of the testicles and avoids overheating.These muscles only develop fully in males in females, they are much smaller and only contain a few loops of muscle.
There are actually two of these muscles on a normal human body one on either side of the scrotum. They originate from the internal oblique muscles and insert beneath the testes. This means that, if a man is in a cold situation, the muscle will contract in order to bring the testicles closer to the body and keep them warm. ![]() For example, in some situations, the muscle will contract during a frightening experience. It typically contracts during sexual intercourse as well, so that even during a particularly vigorous sexual experience, the testicles will not be damaged. Its also possible for a man to manually contract the muscle by pulling in the abdomen. If the reflex arc is working correctly, then a contraction of the muscle on the same side should be observed and the testicle will be raised. Its often the case that this reflex is stronger in the young, although it can still be observed for men. This is interesting as its a different nerve to that which supplies the internal oblique the muscle to which the cremaster originates. One thing that freaked me out a little is the fact that sometimes the cremaster has muscle problems, including severe cramps that wont stop. In some cases they will remove it entirely, without many long term effects. Another interesting point is that they think that low sperm counts might be coming from men using a laptop on their knees. The testes cant stay cool when exposed to that kind of warmth and the sperm basically cook so that they arent fertile anymore. Its not the kind of temperature regulation that the cremaster muscle can help with. But, in most mammals, the testes are shielded from outside influence by the tail and the hind legs.
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