Category: R

A region within the brain or spinal cord where connections (synapses) are made between afferent and efferent neurons of a reflex arc.  

A rose-shaped cluster of phagocytes surrounding lysed nuclear material or red blood cells. Rosette cells occur frequently in blood in which L.E. cells are present. Rosette cells are not diagnostic of lupus erythematosus.  

A cell in the retina of the eye whose scleral end is long and narrow, forming a rod-shaped sensory receptor. Rods are stimulated by light and are essential for vision in dim light.  

An undifferentiated cell of the spleen, bone marrow, or lymphatic tissue that can develop into one of several types of connective tissue cells or into a macrophage.  

The erythrocyte of the blood. Its principal purpose is to transport oxygen to the cells of the body. The hemoglobin that the red cell contains is oxygenated in the lungs, and the oxygen contained in the arterial system is released to the tissues from capillaries.  

The anatomic intensifiers of the human voice, including the upper portion of the larynx, pharynx, nasal cavity, paranasal sinuses, and oral cavity.  

An event or condition that is not immediate in its effect but predisposes to the development of a disease or condition.  

A cataract caused by exposure to radiation, especially from sunlight.  

A urinary cast composed principally of red blood cells strongly suggestive of glomerulonephritis.  

The experimental treatment of full-thickness knee cartilage defects by culturing primitive cartilage stem cells from the patient and then implanting them in cartilage tears. The cells are covered with a thin patch of bone tissue.