Category: P

A lead having one electrode placed over the precordium, the other over an indifferent region.  

Stratum spinosum epidermidis; the layer between the granular and basal layers of the skin. Prickle cells are present in this layer.  

The outermost layer of the retina. Cells contain a pigment called fuscin.  

The superficial layer of the corium lying immediately under the epidermis into which it extends, forming dermal papillae. Outer layer of the dermis, directly beneath the epidermis.  

The physical and chemical properties of chemical elements are periodic functions of atomic weight. A natural classification of elements is made according to their atomic weight. When arranged in order of their atomic weight or atomic number, elements show regular variations in most of their physical and chemical properties.  

Irrigation of the peritoneal cavity (e.g., to diagnose blunt abdominal trauma; to diagnose, by obtaining cytologic specimens, or treat tumors of the peritoneum with chemotherapeutic agents; and to treat peritonitis, assist in evacuation of blood, fecal soilage, and/or purulent secretions as in hemorrhage or peritonitis).  

Uncontrolled laughter (occasionally accompanied by, or alternating with, uncontrolled crying), caused by pseudobulbar lesions of the brain. These lesions may result from lacunar strokes, multiple sclerosis, anoxic brain injury, and other forms of brain injury.  

A type of latrine installed outdoors and used where it is impractical to provide a standard, flushing- type toilet. The structure may be manufactured and installed so that odors and flies are minimized.  

One of the internal and external laminae that make up the pterygoid process of the sphenoid bone. They are areas of attachment for the muscles of mastication.  

A thin sheet of bone forming the perpendicular plate of the ethmoid bone. It supports the upper portion of the nasal septum.