Human Male Reproductive System

What structures are responsible for transporting sperm from the testis to the outside of the body?

Which of the following glands contribute to the composition of seminal plasma?

What is the primary function of the penis in the male reproductive system?

Which anatomical structure follows the seminiferous tubules in the male reproductive system?

Which statement accurately describes the foreskin of the penis?

What is the role of Sertoli cells in the male reproductive system?

Why is the location of the testes outside the abdominal cavity important?

At what age does the formation of ovum typically cease in women?

What are Leydig cells responsible for?

How many sperm-producing seminiferous tubules are typically found in each testicular lobule?

What is the primary purpose of the scrotum in males?

During spermatogenesis, which type of cell undergoes meiotic divisions to produce sperm?

What is the length range of an adult human testis?

Human Male Reproductive System

Humans are sexually reproducing and viviparous.
Reproduction involves gametogenesis (sperm and ovum), insemination, fertilization, zygote formation, blastocyst formation/implantation, embryonic development (gestation), and parturition.
This process occurs after puberty with significant gender differences. Sperm production continues throughout adulthood, while ovum production ceases around age 50.
The male reproductive system is located in the pelvis.
It includes testes, accessory ducts, glands, and external genitalia (penis).
Testes are housed in the scrotum; temperature regulation is crucial for spermatogenesis.
- Temperature is 2–2.5°C lower than internal body temperature.
- Each adult testis is oval, approximately 4–5 cm long and 2–3 cm wide.
Each testis has approximately 250 compartments called testicular lobules.
- Each lobule contains highly coiled seminiferous tubules that produce sperm.
- Inside the tubules are two cell types:
  - Male germ cells (spermatogonia): undergo meiosis for sperm formation
  - Sertoli cells: provide nourishment to germ cells.
- Interstitial spaces contain Leydig cells that synthesize and secrete androgens (male hormones).
Accessory ducts include:
- Rete testis
- Vasa efferentia
- Epididymis (stores and transports sperm)
- Vas deferens (receives from seminal vesicle, forms ejaculatory duct)
The urethra originates from the bladder and passes through the penis to the urethral meatus.
The penis is the male external genitalia; it has erectile tissue for insemination.
The penis's end is the glans penis, covered by foreskin.
Accessory glands include paired seminal vesicles, prostate gland, and paired bulbourethral glands.
- Their secretions (seminal plasma) contain fructose, calcium, and enzymes.
- Bulbourethral gland secretions lubricate the penis.

Explore the intricacies of the human male reproductive system, including gametogenesis, sperm production, and the anatomy involved. Understand the biological processes from puberty to adulthood and learn how temperature regulation plays a role in spermatogenesis.