DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Epididymis. Light micrograph of a section through an epididymis, a tightly coiled tube that connects the testicles to the vas deferens. Sperm cells mature and are stored in the epididymis. The inside of the duct is lined with pseudostratified epithelium (red with blue nuclei). Within the lumen of the duct are the sperm cells (pink). The duct is surrounded by a layer of smooth muscle (red). Magnification: x3 when printed at 10 centimetres wide.
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