PENIS SLIDE 1. Identify the major histological structures of the penis when viewing slides of the penis with a microscope (see list below). corpus spongiosum (SPUN-je-ō-sum) (This is a single cylindrical body surrounding the penile urethra made of a network of venous spaces surrounded by a central artery that fills with blood during sexual excitement, leading to an erection.) corpora cavernosa (KAV-er-no-sah) (These are two paired cylindrical bodies located dorsolaterally. They also fill with blood during sexual excitement.) urethra (This is a muscular tube that carries urine from the urinary bladder to the exterior. In males the urethra also serves as a passageway for ejaculated sperm.) Label the image below.

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