Penis

Looks like

Three columns of spongy erectile tissue, the lower one carrying the urine channel and capped by the glans.

What it does

Passes urine, and becomes rigid with blood for sex.

Keeping it well

Condoms, wash under the foreskin, do not smoke; erection trouble is often the first sign of artery disease.

Its parts

• Corpora cavernosa
• Corpus spongiosum
• Glans & foreskin
• Skin of penis
• Superficial dorsal vein of penis

Related conditions

• Balanitis
• Bone metastases and spinal cord compression
• Chronic venous insufficiency
• Clotting disorders (thrombophilia & APS)
• Deep vein thrombosis
• Erectile dysfunction
• Hypospadias
• Lichen sclerosus
• Penile cancer
• Peyronie's disease
• Phimosis
• Premature ejaculation
• Priapism
• Varicose veins