Structure and Function
The testes is covered by the tunica albuginea.
Septa emanate from the tunical albuginea to subdivide the testis into incomplete lobules.
The septa converge towards the midline of the posterior border, meeting along a thickening of the tunica albuginea called the mediastinum testis.
Each lobule contains one to four seminiferous tubules embedded in a connective tissue stroma.
Reference
http://medcell.med.yale.edu/histology/male_reproductive_system_lab.php#pathology