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Proper testicular development
 
   
   
Human males (and other male mammals) usually have two testicles in their scrotum. The testicles are firm, oval-shaped glands. Most men have testicles that match in size, but some men's testicles are much larger or smaller than other men's
 
 
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It is normal for an adult man to have testicles that are between 14 cm³ to 35 cm³ in size.

Nearly all men have one testicle that hangs lower than the other one. Scientists think this may be so that they don't hit against each other. It can be either the left or the right that hangs lower, but in 85% of men, it is the left.

The testicles hang in the scrotum by the spermatic cord. They are outside the body because they need to be cooler than the temperature inside the body, in order to make sperm. If a man's testicles get cold, they are automatically pulled closer to the body. The spermatic cord is tightened by the cremasteric muscle. When this muscle contracts (pulls tighter), the cord gets shorter, which pulls the testicles closer to the body.

If the testicles are too warm, the cremasteric muscle relaxes (gets longer.) This lowers the testicles to keep them cooler. This is how the testicles are kept at the right temperature. This is called the cremasteric reflex. (A reflex is something your body automatically does without you thinking about it.)

 
 

There are other uses for the cremasteric reflex apart from making the testicles the right temperature. Stress can also make the cremasteric reflex work. If a male human or mammal gets into a fight, then its testicles are in danger. They automatically pull up close to the body. The cremasteric reflex also happens during sexual intercourse.

Size in men

Most men's testicles are from 14 cm³ to 35 cm³. This is a measure of volume. Sometimes Doctors need to measure a man's testicles to see if there is a problem. Doctors can measure the volume of testicles in two ways:

* Orchidometer – This is a set of small objects that look like eggs. They are many different sizes. The doctor picks the one that is the size of the testicle. Doctors know what size the orchidometer is. Then they know the size of the testicle. * Measuring the size – with a ruler, calipers, or ultrasound. Then these lengths are used to calculate the volume.

tamaños de pelotasSometimes the size of a man's testicles changes.

Some reasons why testicles get smaller are:

* If a man takes testosterone, the testicles do not have to work to make testosterone, so they become smaller. * If a man's testicles are kept more warm than usual, they make less sperm. So if they are kept too warm, they get smaller. * If testicles are injured(hurt) they can become smaller.

Some reasons why testicles get bigger are:

* If a man takes hormones from the pituitary gland, (called gonadotropins), it can make testicles bigger. Gonadtropins are the hormones that tell the testicles to make sperm and testosterone. * Some diseases cause testicles to swell.

If you find any hardening or size, consultation with your doctor immediately.

 
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