The testis is the site where spermatogenesis and spermiogenesis occur within the seminiferous tubules, giving rise to haploid gametes with the morphological features necessary for fertilization. The testis also produces testosterone, which is essential for sperm production and development and maintenance of secondary sex characteristics.

Sperm travel through intratesticular ducts (straight tubules and rete testis) and then into the epididymis where they further mature (e.g. becoming decapacitated and acquiring the ability to swim) and are stored until they are ejaculated. During ejaculation they travel into the ductus deferens, ejaculatory duct, prostatic urethra, and then exit the body through the penile urethra.

Study the table and diagram of the testes, epididymis, and ductus deferens, noting their locations, features, and functions for correlation with the slides we’ll study in this unit.

Examine this trichrome-stained section of testis at low magnification. Identify the following structures:

• Capsule (tunica albuginea)
• Mediastinum testis
• Rete testis
• Connective tissue septa
• Seminiferous tubules.
   

More about the testis.