What is the thick fibrous capsule that covers the testicle?

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The thick fibrous capsule surrounding the testicle is the tunica albuginea. It is a dense layer of connective tissue that lies just beneath the tunica vaginalis and forms a firm outer boundary for the testis. It extends inward as septa that partition the organ into lobules containing the seminiferous tubules, providing essential structural support and protection. On imaging, this capsule appears as a bright, echogenic line outlining the testis. The tunica vaginalis is a serous covering of the testis, the tunica dartos is a muscular layer of the scrotal wall, and there isn’t a standard structure called the epididymal tunic that serves as the testicular capsule.