Anatomy study note · Abdomen

Testis

The male gonad, a firm mobile organ in the scrotum that produces spermatozoa and testosterone. The left usually hangs lower than the right.

Key points

• Tunica albuginea → lobules → seminiferous tubules → rete testis → efferent ductules → epididymis.
• Testicular artery from the aorta (L2).
• Lymph → para-aortic nodes at L1 (not inguinal).
• Torsion = surgical emergency.
• Kept ~3°C cooler than the abdomen.
• Descent: scrotum by the end of the 8th month.
• Cryptorchidism → infertility, malignancy risk.
• Sertoli: blood–testis barrier, ABP, inhibin.
• Leydig: testosterone (LH).

The full note in the atlas also covers

Features · Blood supply · Lymph drainage · Histology · Development · Clinical notes

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 6, PDF pp. 736–747
• Inderbir Singh’s Human Embryology, ch. 16, PDF pp. 302–306
• BRS Cell Biology & Histology, 7th ed., ch. 20, PDF pp. 362–364, 367

More from the abdomen

• Transverse colon
• Transversus abdominis
• Umbilical cord
• Ureter
• Vas deferens
• Abdominal aorta
• Abdominal lymph nodes
• Appendix
• Ascending colon
• Biliary tree
• Caecum
• Coeliac trunk

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