The mediastinum testis is a network of fibrous connective tissue that extends from the upper to near the lower extremity of the testis, and is wider above than below.

From its front and sides numerous imperfect septa

Septa of testis

Each lobule of the testis is contained in one of the intervals between the fibrous septa which extend between the mediastinum testis and the tunica albuginea, and consists of from one to three, or more, minute convoluted tubes, the tubuli seminiferi....

 (trabeculæ) are given off, which radiate toward the surface of the organ, and are attached to the tunica albuginea

Tunica albuginea

Tunica albuginea is an anatomy term that literally means "white covering."It is used to refer to three anatomical areas which include:*Tunica albuginea , the tough fibrous layer of connective tissue that surrounds the corpora cavernosa of the penis...

.

They divide the interior of the organ into a number of incomplete spaces, called lobules

Lobules of testis

The glandular structure of the testis consists of numerous lobules.Their number, in a single testis, is estimated by Berres at 250, and by Krause at 400.They differ in size according to their position, those in the middle of the gland being larger and longer....

. These are somewhat cone-shaped, being broad at their bases at the surface of the gland, and becoming narrower as they converge to the mediastinum.

The mediastinum supports the rete testis

Rete testis

Rete testis is an anastomosing network of delicate tubules located in the hilum of the testicle that carries sperm from the seminiferous tubules to the vasa efferentia....

and blood vessels of the testis in their passage to and from the substance of the gland.

External links

"Mediastinum (human)" - "Inguinal Region, Scrotum and Testes: Testis"