• Bacteria vs. Cheek cells

Male reproductive system - basic principle

Male reproductive organs Scrotum Testis Epididymis Ejaculatory duct Ampulla of ductus deferens Ureter Urinary bladder Prostatic urethra Prostate gland Spermatid cord Spongy urethra Corpora cavernosa Corpus spongiosum Glans penis

Prostate and urethra Prostate gland Prostatic urethra Prostate gland Ejaculatory duct Ampulla of vas deferens Urinary bladder

Penis and urethra Skin around the penis Corpora cavernosa Spongy urethra Corpus spongiosum Glans penis Urethral orifice Scrotal sac Testis Epididymis Spermatic cord

Testis histology Developing spermatids in seminiferous tubule Lumen of seminiferous tubule with spermatozoa Leydig or interstitial cells Seminiferous tubule

Sperm Tail (flagellum) Head Midpiece