The pharynx has three parts or areas; nasopharynx concerned with breathing; the oropharynx is a passage for both air and food and the lowest part, the laryngeal pharynx, situated behind the larynx, is involved in swallowing.

Phenol Quick Reference: (fen-ol) Chemical chiefly used as a disinfectant, e.g. carbolic acid.

Advanced Reference: Phenol (carbolic acid) is derived from coal tar and used in many forms and strengths as a disinfectant. Dettol being one well-known preparation. Phenol is also used for nerve block in chronic pain and for sclerotherapy of haemorrhoids, etc.

Phimosis Quick Reference: (fi-mose-is) Tightness of the foreskin so that it cannot be retracted over the head of the penis.

Advanced Reference: Common in young children and treated by circumcision. Sometimes not actually due to tightness of the foreskin but that the foreskin may still have attachments to underlying tissue until 3-4 years of age.

Phlebitis Quick Reference: (flee-bite-is) Inflammation of a vein.

Advanced Reference: Generally also associated with blockage of the vessel as in thrombophlebitis. May be found at the site of previous IV cannula insertion, due to both inflammation and localised infection.

Phlebo Quick Reference: (flee-bo) Prefix indicating vein.

Advanced Reference: Phlebo as in phlebotomy, thrombophlebitis. Along with veno means pertaining to a vein.

Phlegm Quick Reference: (flem) Mucous.

Advanced Reference: Thick mucous secreted into the nose, throat and bronchial passages.

Phrenic Quick Reference: Relating to the diaphragm.

Advanced Reference: The phrenic nerve supplies the muscles of the diaphragm. Arises on each side in the neck and passes downwards between the lungs and heart.

Pia mater Quick Reference: Innermost of the three membranes that cover the brain and spinal cord.

Advanced Reference: A very delicate membrane separated from the arachnoid mater by a space containing the cerebrospinal fluid (CSF).

Piggy-back Quick Reference: Slang term used to indicate one on top of another. A piggy-back ride.

Advanced Reference: A piggy-back catheter is one in which an accessory line can be joined to the main lumen. It is common practice to plug an accessory line into the latex bung of a giving-set via a hypodermic needle.

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