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To erect a house or a fort. To cause to stand up or out. To raise and place in an upright or perpendicular position; to set upright; to raise. to erect a pole, a flagstaff, a monument, etc.
Inside, two cylinder-shaped chambers called the corpora cavernosa run the length of the penis. They have a maze of blood vessels, tissue, and open pockets. The urethra, the tube that urine and semen flow through, runs along the underside of them, in the spongy tissue.