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** Allows the testes to shrink and return to the abdomen during the non-breeding season.
 
** Allows the testes to shrink and return to the abdomen during the non-breeding season.
 
* Head and tail of the epididymis are the sites of extremely large fat pads.
 
* Head and tail of the epididymis are the sites of extremely large fat pads.
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== Accessory Sex Glands ==
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Rats have highly developed accessory sex glands.  These produce a gelatinous copulatory plug, which is visible in the vagina post-mating and is thought to prevent semen leaking out.
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* '''Seminal Vesicles''': Lie dorsolateral to the urinary bladder in contact with the rectum dorsally. 
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** Large and lobated, opening into the lower end of the ductus deferens.
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** Each is enclosed in a capsule together with the coagulating gland.
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* '''Prostate Gland''': Bilateral and has three lobes: the dorsal, lateral and ventral.
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** Dorsal known is known as the '''Coagulating Gland'''. 
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*** Lies close to the seminal vesicle.
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* '''Ampullary Glands''': The glands of the ductus deferens.
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** Lie near the bladder.
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* '''Bulbourethral Glands''': Found near the urethra as it exits the pelvis.
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* '''Preputial Glands''': Lie in the subcutaneous fat near the penis and open into the prepuce.
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** Sebacious glands that secrete a pheramone used for scent marking.
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** Regress with age and fill with stagnant sebum.
    
== Puberty and Sexual Maturity ==
 
== Puberty and Sexual Maturity ==
    
* Sexually mature at 6-8 weeks
 
* Sexually mature at 6-8 weeks
      
== Mammary Gland ==
 
== Mammary Gland ==
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