Mycoplasma
A large group of bacteria, with more than 100 types identified. Mycoplasma are very simple one-celled organisms without outer membranes. They penetrate and infect individual cells. Mycoplasma hominis and Mycoplasma pneumoniae are examples of mycoplasma bacteria that occur in humans.
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- Mycosis fungoides
A type of non-Hodgkin’s lymphoma that first appears on the skin. Also known as cutaneous T-cell lymphoma.
- Mycotoxin
A toxin produced by a fungus. A mycotoxin may be formed when grains or some other products become moldy. From myco-, fungal + -toxin = a fungal toxin.
- Mydriasis
Dilation of the pupil. The opposite of mydriasis is miosis.
- Myelin
The fatty substance that covers and protects nerves. Myelin is a layered tissue that surrounds the nerve fibers (axons). This sheath around the axons acts like a conduit in an electrical system, ensuring that messages sent by axons are not lost en route.
- Myelination
The formation of the myelin sheath around a nerve fiber. Also known as myelinization.