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A close-up of a person writing with a silver pen on a small spiral notebook placed on a wooden table. One hand holds the pen while the other hand points to the paper. The writing is blurred and not readable.

Microscopic view of human tissue showing tightly packed round cells with dark purple nuclei and light pink cytoplasm, highlighting cellular structure and detail under high magnification.

What are Seminiferous Tubules?

(Image courtesy of Nephron, CC BY-SA 3.0 )

Male Reproductive System

A black-and-white anatomical illustration showing the male reproductive organs: vas deferens, ampulla, seminal vesicle, ejaculatory duct, urethra, isthmus, and prostate, each labeled with lines pointing to the structures.

What are Seminal Vesicles?

(Image courtesy of Henry Vandyke Carter, Public domain, via Wikimedia Commons )

Male Reproductive System

Microscope image of a cross-section of a seminiferous tubule in testis tissue, showing various labeled cell types and structures involved in spermatogenesis with annotations and circles marking different locations.

What is the Blood-Testis Barrier?

(Image courtesy of StemBook )

Male Reproductive System

Hand-drawn cross-section of a seminiferous tubule showing labeled cells: spermatocyte, spermatid, cell of Sertoli, spermatogonium, and spermatozoon at different stages of sperm development.

What are Sertoli Cells?

Sertoli cells are a specialized cell type found in the seminiferous tubules of the testes that facilitate the production of new sperm, or spermatogenesis. Learn more in this primer.

Male Reproductive System

Diagram showing the structure of the penis and nearby organs, including labels for the prostate gland, urinary bladder, corpus cavernosum, corpus spongiosum, urethra sections, scrotum, and glans penis.

What are Bulbourethral Glands?

Also known as Cowper's glands, the bulbourethral glands are two small glands in the male reproductive system that produce and secrete a pre-ejaculate fluid called Cowper's fluid, known colloquially as “pre-cum”. This primer provides additional information

Male Reproductive System

Black-and-white anatomical diagram of the male reproductive system showing the prostate, ejaculatory duct, seminal vesicles, prostatic utricle, urethral crest, and prostatic urethra, with labeled parts.

What are Ejaculatory Ducts?

The ejaculatory ducts are a part of the male anatomy that allows the flow of sperm from the testes through the reproductive system and eventually out through the urethra. Learn more in this primer.

Male Reproductive System

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