Category: O

Refers to tumors, cancer, and other neoplasms. The origin and development of a tumour. Part of the DNA that contains genes responsible for cell division and tissue growth. When their expression is uncontrolled, cancer develops. When a normal cell escapes its usual constraint in terms of growth and function, it does so through the action…

The concept that mammalian cell chromosomes harbor unexpressed viral DNA and that virus growth can be initiated by ionizing radiation or by cocarcinogens causing the cells in which the viruses grow to become cancerous.  

River blindness. Caused by a tiny worm transmitted to humans by the bite of infected flies. Most prevalent in Central America and Africa. Infestation with Onchocerca in which the larvae can move into the eye, causing river blindness. Disease common in Central and South America and Africa in which the bite of black fleas transmits…

Inflammation or infection of the naval.    

An organism that eats both plant and animal products. An omnivore is a creature whose teeth and digestive system are adapted to consume both plant and animal matter. It is important to note that the term does not imply an equal consumption of plant and animal products within a specific species. Examples of omnivores include…

A product of tryptophan that gives rise to pigments, particularly of the eye in animals.  

The apron of fatty tissue that hangs down from the stomach to cover most of the front surface of the abdominal region. A double fold of peritoneum hanging down over the intestines. Omenta, fold of peritoneal tissue attaching and supporting the stomach and adjacent organs. A double fold of the membrane lining the abdominal cavity.…

Unpredictable, irregular menstrual periods.  

A type of connective tissue cell found in the brain and spinal cord. A neuroglial cell of ectodermal origin that, in the central nervous system, forms or maintains the myelin sheath of neural processes. This type of cell has long, slender processes and is often found associated with nerve cells or satellites.  

The first cranial nerve associated with the sense of smell, olfaction. The first cranial nerve which controls the sense of smell. One of a pair of sensory nerves, the first cranial nerves, that transmit impulses from the mucous membranes of the nasal cavity to the olfactory center in the brain. The first cranial nerve (I):…