The two innermost layers of tissue that cover the brain and spinal cord. The two layers are called the arachnoid mater and pia mater.
An infectious disease caused by a particular type of bacteria called a spirochete transmitted by rats as well as by skunks, opossums, raccoons, foxes, and other vermin. Leptospirosis occurs worldwide but is most commonly acquired in the tropics. About 100 cases of leptospirosis are reported each year in the US. The disease is becoming a […]
Female homosexuality. Also known as Sapphism.
- Let down reflex
An involuntary reflex during the period of time when a women is breastfeeding which causes the milk to flow freely.
An area of abnormal tissue change. Lesions vary in severity from harmless to serious.
- Lethal gene, zygotic
A gene that is fatal for the zygote, the cell formed by the union of a sperm and an egg. The zygote would normally develop into an embryo, as instructed by the genetic material within the unified cell. However, a zygotic lethal gene kills prenatal development at its earliest point. A zygotic lethal gene is […]