Category: O

A genus of widely distributed nonbloodsucking flies, occurring wherever sheep and goats are raised. The parasitic larvae of O. ovis, the sheep nostril fly, may occasionally and accidentally infect man. By means of large mouth hooks, it attaches itself to the conjunctiva of the eye, causing a painful myiasis that may result in loss of…

A genus of parasitic nematodes occurring in Brazil, Africa, and Indonesia. It is a rare intestinal parasite of man, producing symptoms of dysentery in cases of heavy infection. The worms may also invade the tissues of the gut wail, giving rise to abscesses. The worms can be eliminated with tetrachloroethylene. A genus of nematodes belonging…

A woman who has been pregnant at least eight times and has given birth to an infant capable of survival after each of eight pregnancies.  

Rates and causes of death in relation to different jobs, occupational and socioeconomic groups, or social class. Because some occupations have older incumbents than others (e.g. judges) allowance for age bias is made by comparing either standardized mortality ratios for those aged 15-64 years or related but less familiar indices, such as comparative mortality figure…

Either of two muscles that cover the outer surface of the anterior wall of the pelvis (the obturator externus and obturator internus) and are responsible for lateral rotation of the thigh and movements of the hip.  

The curved lower margin of the fourth ventricle of the brain, between the medulla oblongata and the cerebellum. A thin, crescent-shaped band of tissue covering the calamus scriptorius at the point of convergence of nervous tissue at the caudal end of the fourth ventricle of the brain.  

A test in which pictures of the developing fetus are made from sound waves. This painless and safe procedure is used in hospitals and many doctors’ offices to determine the age and rate of growth of the fetus and its position in the uterus. Ultrasound can also be used to identify multiple pregnancies or a…

Disorders of physical development, usually in the first years of life, characterized by overly rapid growth. Children with overgrowth syndromes usually demonstrate delayed motor, cognitive, and social development, in addition to reduced muscle tone and impaired speech development. Some syndromes are genetic disorders, and others are caused by tumors. Symptoms vary according to the disorder.…

The diagnostic process of observing the external ear canal and the eardrum using an otoscope. The physician pulls the top of the ear up and back to straighten the ear canal, which provides a clear view of the canal and eardrum when the curved tip of the otoscope is inserted into the canal. This examination…

Drugs used to treat conditions inside the ear. Otic preparations, also known as ear drops, help provide relief from symptoms such as redness, irritation, and discomfort in the ear canal. For example, bacterial infections of the ear canal are sometimes treated with a combination of antibiotic and cortisone like medications.