The image you've uploaded is a labeled diagram of the
male reproductive system, and it includes six key structures, each numbered and identified in the legend below. Let's go through the diagram and explain the function and significance of each part:
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🔹 Labeled Structures:
1.
Penis
- The external organ used for sexual intercourse and urination.
- Contains erectile tissue that fills with blood during arousal, leading to erection.
- The
urethra runs through the penis, carrying both urine and semen out of the body.
2.
Urethra
- A tube that runs from the bladder through the prostate gland and penis.
- Carries urine from the bladder and semen from the reproductive organs out of the body.
- It serves a dual purpose: urinary and reproductive.
3.
Scrotum
- The sac-like structure outside the body that holds the testicles.
- Helps regulate temperature—about 2–3°C cooler than body temperature—which is essential for sperm production (spermatogenesis).
4.
Testicle (Testis)
- The primary male reproductive organs.
- Produce
sperm (spermatogenesis) and
testosterone (the main male sex hormone).
- Each testicle is suspended within the scrotum.
5.
Seminal vesicle
- Glands located near the base of the bladder.
- Produce about 60% of the volume of semen.
- Their fluid contains fructose (energy source for sperm), prostaglandins, and other substances that support sperm motility and survival.
6.
Vas deferens
- A muscular tube that transports mature sperm from the epididymis to the ejaculatory duct.
- Also known as the
ductus deferens.
- It connects the epididymis to the seminal vesicles and forms the ejaculatory duct when joined with the duct from the seminal vesicle.
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🔄 How Sperm Travel Through the System:
1. Sperm are produced in the
seminiferous tubules inside the
testicles.
2. They mature and are stored in the
epididymis (not labeled here but attached to the testicle).
3. During ejaculation, sperm travel through the
vas deferens.
4. The vas deferens joins with the duct from the
seminal vesicle to form the
ejaculatory duct.
5. The ejaculatory duct empties into the
urethra.
6. The
prostate gland (also not labeled) adds fluid to the semen as it passes through the urethra.
7. Finally, semen exits the body via the
penis.
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✔ Summary:
This diagram clearly shows the major components of the male reproductive system, emphasizing:
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Sperm production (testicles),
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Sperm transport (vas deferens),
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Accessory glands (seminal vesicles),
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External genitalia (penis, scrotum),
- And the shared pathway for
urine and semen (urethra).
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Parent Tip: Review the logic above to help your child master the concept of human reproductive systems worksheet.
