Changes

The parenchyma of the testes is composed of the '''semniferous tubules''', '''rete testis''' and '''efferent ducts'''.  The '''semniferous tubules''' are the site of [[Spermatogenesis and Spermiation - Anatomy & Physiology|spermatogenesis]]. The walls of the semniferous tubules contain '''spermatogenic cells''' and their sustentacular cells, which are known as '''sertoli cells'''. The sertoli cells give support and also produce hormones. They regulate [[Spermatogenesis and Spermiation - Anatomy & Physiology|spermatogenesis]] and the release of spermatozoa into the lumen of the semniferous tubules. Each semniferous tubule opens into a network of tubules called the '''rete testis'''. Each rete testis is drained by multiple '''efferent ducts''' which perforate the capsule of the testes to enter the '''head of the epididymis'''. The interstitial tissue between semniferous  tubules contains '''Leydig cells'''. These cells produce androgens, such as '''testosterone'''.   

The parenchyma of the testes is composed of the '''semniferous tubules''', '''rete testis''' and '''efferent ducts'''.  The '''semniferous tubules''' are the site of [[Spermatogenesis and Spermiation - Anatomy & Physiology|spermatogenesis]]. The walls of the semniferous tubules contain '''spermatogenic cells''' and their sustentacular cells, which are known as '''sertoli cells'''. The sertoli cells give support and also produce hormones. They regulate [[Spermatogenesis and Spermiation - Anatomy & Physiology|spermatogenesis]] and the release of spermatozoa into the lumen of the semniferous tubules. Each semniferous tubule opens into a network of tubules called the '''rete testis'''. Each rete testis is drained by multiple '''efferent ducts''' which perforate the capsule of the testes to enter the '''head of the epididymis'''. The interstitial tissue between semniferous  tubules contains '''Leydig cells'''. These cells produce androgens, such as '''testosterone'''.   

The Blood-Testes Barrier is formed by tight junctions between neighbouring Sertoli cells. This barrier prevents leukocytes from entering the adluminal compartment of the seminipherous tubules and autoreacting to the haploid spermatids within it.

The '''Blood-Testes Barrier''' is formed by tight junctions between neighbouring Sertoli cells. This barrier prevents leukocytes from entering the adluminal compartment of the seminipherous tubules and autoreacting to the haploid spermatids within it.

 

===Epididymis===

===Epididymis===

===Lymphatics===

===Lymphatics===

Lymph from the penis and prepuce drains into the '''superficial inguinal lymph nodes'''.

Lymph from the penis and prepuce drains into the '''superficial inguinal lymph nodes'''.

==Accessory Sex Glands==

==Accessory Sex Glands==

The paired vesicular glands are found dorsocranial to the pelvic urethra. In the horse, the '''excretory duct''' from the vesicular glands join the ductus deferens to form the '''ejaculatory duct'''. They are also relatively large in the horse and are hollow with a thick, muscular wall and smooth surface.

The paired vesicular glands are found dorsocranial to the pelvic urethra. In the horse, the '''excretory duct''' from the vesicular glands join the ductus deferens to form the '''ejaculatory duct'''. They are also relatively large in the horse and are hollow with a thick, muscular wall and smooth surface.

==Clinical Links==

==Clinical Links==