Category: O

Manipulation of the eye to alter intraocular pressure or ocular blood flow.  

In each lung, the deep groove separating the bottom and side of the upper lobe from the top and side of the lower lobe.  

The olfactory bulb and tract.  

A form of low-density lipoprotein cholesterol whose presence in the blood is often associated with unstable coronary events, such as acute myocardial infarction.  

A lipoma in which the connective tissue has undergone calcareous degeneration.  

Upper and lower lips that surround the mouth opening and form the anterior wall of the buccal cavity.  

The imaginary line running through the mid-orbit and external auditory meatus. It is commonly used for radiographic positioning.  

A line appearing between the inner canthus of the eye and the cheek, supposedly indicative of neural disorders.  

A lens that produces no distortion of the periphery of the image.  

A special lens with oil placed between the lens and the object being visualized. This eliminates a layer of air between the microscope slide and the lens, producing a clearer image than would be the case if the oil were not used.