Changes

* Opening of the prepuce is on the ventral abdomen.

* Opening of the prepuce is on the ventral abdomen.

== Testes ===

=== Testes ====

=== Introduction ===

==== Introduction ====

Two testes are carried externally in the scrotum. Once testes have descended, the inguinal canal closes and they are not able to be retracted. Spermatogenic activity increases within the semniferous tubules of the testes from December-July. Testes become noticeably enlarged in preparation for the breeding season (March-August).

Two testes are carried externally in the scrotum. Once testes have descended, the inguinal canal closes and they are not able to be retracted. Spermatogenic activity increases within the semniferous tubules of the testes from December-July. Testes become noticeably enlarged in preparation for the breeding season (March-August).

=== Structural Anatomy ===

==== Structural Anatomy ====

* Epididymis is composed of a mass of convoluted spermatic duct.

* Epididymis is composed of a mass of convoluted spermatic duct.

*** Medial to the body of the epididymis.

*** Medial to the body of the epididymis.

=== Blood Supply, Nerves and Lymphatics ===

==== Blood Supply, Nerves and Lymphatics ====

* Ductus deferens is accompanied by the deferent artery and vein.

* Ductus deferens is accompanied by the deferent artery and vein.

* Spermatic cord continues, looping over the urethra through the prostate gland.

* Spermatic cord continues, looping over the urethra through the prostate gland.

=== Histology ===

==== Histology ====

* Testes, blood vessels, [[Nervous_System_-_PNS_-_Anatomy_%26_Physiology|nerves]], [[Lymphatic_Vessels_-_Anatomy_%26_Physiology|lymphatics]] and ductus deferens are wrapped in a pouch of peritoneum called the Vaginal Sac.

* Testes, blood vessels, [[Nervous_System_-_PNS_-_Anatomy_%26_Physiology|nerves]], [[Lymphatic_Vessels_-_Anatomy_%26_Physiology|lymphatics]] and ductus deferens are wrapped in a pouch of peritoneum called the Vaginal Sac.

** Extends through the inguinal canal in development prior to testicular descent.

** Extends through the inguinal canal in development prior to testicular descent.

=== Accessory Glands ===

==== Accessory Glands ====

* The only accessory sex gland is the '''prostate gland'''.

* The only accessory sex gland is the '''prostate gland'''.

* At the level of the prostate, the ductus deferens from each side opens into the urethra.

* At the level of the prostate, the ductus deferens from each side opens into the urethra.

=== Puberty and Sexual Maturity ===

==== Puberty and Sexual Maturity ====

* Males mate the year after they are born.

* Males mate the year after they are born.