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Mouse Reproduction - Anatomy & Physiology (view source)

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== Male ==

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* Os penis lies within the tissue of the penis.

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* Two testes in an external scrotum.

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* Open inguinal canals throughout life.

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** Allows testes to shrink and return to the abdomen in the non-breeding season.

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* Sexually mature at 6-7 weeks.

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* Teats are absent.

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