Light micrograph tissue section showing the structure of a human penis. The penis is an organ that includes three cylindrical spaces (blood-filled sinuses) of erectile tissue. The two larger ones, the corpora cavernosa, lie side by side. The third sinus, the corpus spongiosum, surrounds most of the urethra. When these spaces fill with blood, the penis becomes large and rigid (erect).

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TOP26387211

Source:

達志影像

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RM

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須由TPG 完整授權

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