| Term | Definition |
|---|
| Penis | Structure that contains the urethra |
| Corpus spongiosum | Tissue that forms the end of the penis that surrounds the urethra |
| Corpora cavernosa | Forms the shaft fo the entire penis |
| Glans penis | Distal end of the penis that is slightly enlarged |
| Corona | The margin of the glands penis |
| Prepuce | Covers the glands penis (foreskin) |
| Circumcision | Removal of part or all of the prepuce |
| Root | Attached portion of the penis (proximal portion) |
| Bulb | Expanded region of the root made of corpus spongiosum |
| Crura | Outer portion of the root, made of corpora cavernosa |
| Erection | Enlargement and stiffening of the penis triggered by the PNS; causes blood vessels to dilate and increased blood to enter; expansion of the tissue compresses the veins that drains the penis, which maitains the erection |
| Nitric oxide | Produced during an erection; causes the smooth muscle in the arterioles supplying the penis to relax |
| Ejaculation | Sympathetic response; reflex is triggered by nerves in the spinal cord that causes the release of semen from the urethra |
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