STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Sperm production. Coloured scanning electron micrograph (SEM) of sperm cells (spermatozoa) in the seminiferous tubules of the testis. This is the site of spermatogenesis (sperm production). Sperm tails are yellow, sperm heads are pale pink and Sertoli cells are dark pink. Connective tissue sheaths are green. Magnification: x160 when printed at 10 centimetres wide.
Model release not available. Property release not required.