Lobules of testis

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Lobules of Testis

The lobules of the testis are the compartments within the testis that contain the seminiferous tubules, where spermatogenesis occurs. Each testis is divided into approximately 250 lobules by fibrous septa that extend inward from the tunica albuginea, the dense connective tissue capsule surrounding the testis.

Structure

The lobules of the testis are conical in shape, with their bases directed towards the tunica albuginea and their apices converging towards the mediastinum testis. Each lobule contains one to four highly coiled seminiferous tubules, which are the site of sperm production. The seminiferous tubules are lined with a specialized epithelium that includes Sertoli cells and spermatogenic cells.

Function

The primary function of the lobules of the testis is to facilitate the production of sperm. The seminiferous tubules within each lobule are the site of spermatogenesis, the process by which spermatogonia develop into mature spermatozoa. The Sertoli cells within the tubules provide structural and nutritional support to the developing sperm cells.

Blood Supply

The blood supply to the lobules of the testis is provided by the testicular artery, which branches from the abdominal aorta. The testicular veins drain the blood from the testis and form the pampiniform plexus, which helps in the regulation of testicular temperature.

Clinical Significance

Disorders of the lobules of the testis can lead to impaired spermatogenesis and infertility. Conditions such as varicocele, orchitis, and testicular torsion can affect the function of the lobules and the overall health of the testis.

See Also

• Testis
• Spermatogenesis
• Seminiferous tubules
• Sertoli cells
• Leydig cells
• Tunica albuginea
• Mediastinum testis