Christopher G. Wood MD FACS


Human Chorionic Gonadotropin (HCG)

Human chorionic gonadotropin (hCG) is a hormone that is usually produced during pregnancy. But some types of cancer can also cause high levels of hCG. The amount of hCG may be measured in blood or urine to see if a woman is pregnant. The test also may be done as part of a screening test for birth defects. High levels of…

Human Chorionic Gonadotropin (HCG)

Human chorionic gonadotropin (hCG) is a hormone that is usually produced during pregnancy. But some types of cancer can also cause high levels of hCG. The amount of hCG may be measured in blood or urine to see if a woman is pregnant. The test also may be done as part of a screening test for birth defects. High levels of…

Blood supply to the penis during an erection

Arteries and veins carry blood to and from the penis. These blood vessels play an important role in erections. During an erection, the arteries expand to increase blood flow to the penis. The blood fills two tubes of spongy tissue in the penis (corpus cavernosa). This causes them to swell, making the penis larger and…

Penile Implant for Erection Problems

With one type of penile implant, the man gets an erection by pumping the implant full of salt water stored in a reservoir in his lower abdomen. A release valve in the scrotum drains the saline out of the cylinders and back into the reservoir.

How Erections Occur

An erection occurs when your imagination or one or more of the senses (vision, hearing, touch, smell, taste) are stimulated and you become aroused. Your central nervous system sends nerve impulses that increase blood flow to your penis. The blood fills the spongy chambers (corpora cavernosa) in the penis, causing them…