Category: L

A ring-like arrangement of lymphoid tonsillar tissue around the oronasal region of the pharynx. It consists of the palatine, pharyngeal, and lingual tonsils and provides protection against invading bacteria, viruses, and other foreign antigens.  

Increased muscular tone in an extremity in which (as opposed to cogwheel rigidity) the affected muscle does not move in a discontinuous or jerking fashion as it is pulled back and forth.  

Rickets that has its onset in older children.  

A rudimentary rib that develops in relation to a lumbar vertebra.  

Brownish incremental lines seen in microscopic sections of tooth enamel. They appear as concentric lines in transverse sections through the enamel crown.  

Use of laser treatments to repair wrinkled or photoaged skin for aesthetic purposes. Carbon dioxide and other lasers are used to remove the damaged dermis and repair underlying connective tissues. Whether these treatments have long-term adverse effects is unknown.  

Dyspnea or difficult breathing; respiration that involves active participation of accessory inspiratory and expiratory muscles.  

An agent used to relieve a local condition such as a sore.  

Relaxation limited to a particular muscle group or to a certain part.  

An irritation of the skin over the erector spinae muscles, causing contraction of the back muscles.