Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «P»:
Penis: The external male sex organ used to copulate and ejaculate semen and to convey urine
outside the body.
The penis contains two chambers, the corpora cavernosa, which run the length of the organ. These are filled with spongy tissue and surrounded by a membrane called the tunica albuginea. Th...
Penis, cancer of the
Penis, cancer of the: Cancer of the penis is a disease in
which cancer (malignant) cells originate in the tissues of the penis.
Cancer of the penis is rare in the
Men who are not circumcised at birth may have a higher risk for
getting cancer of the penis. (A circumcision is an o...
Penis, erection of the
Penis, erection of the: When the penis fills with blood
and is rigid. The penis contains two chambers, called the corpora cavernosa, which run the
length of the organ, are filled with spongy tissue, and surrounded by a membrane, called
the tunica albuginea. The spongy tissue contains smooth muscles,...
Penis, hypospadias of the
Penis, hypospadias of the: birth defect of the penis involving
the urethra (the transport tube leading from the bladder to discharge urine outside the body). The urethra in the male normally travels through the full length of the penis so that the stream of urine comes from the usual urethral open...
Penis, inflammation of the foreskin and glans
Penis, inflammation of the foreskin & glans: In the uncircumcised male, balanitis (inflammation of the glans, the rounded head of the penis) and posthitis (inflammation of the foreskin) usually occur together as balanoposthitis: inflammation of both the glans and foreskin. Circumcision prevents ...
Penis, inflammation of the head of the
Penis, inflammation of the head of the: Inflammation of the rounded head (the glans) of the penis is called balanitis.
In the uncircumcised male, balanitis and posthitis (inflammation of the foreskin) usually occur together as balanoposthitis: inflammation of both the glans and foreskin.
Penis, small: A penis that is
abnormally small, also known as micropenis. In medical
practice, the dimension of the penis that is measured is
the length. This measurement is taken along the upper
surface of the shaft of the penis to the tip, using a
measuring tape or preferably a ruler. The r...
Penrose drain: A soft tube-shaped rubber or silicone drain. Named for the American gynecologist Charles Bingham Penrose (1862-1925)....
Pentapeptide: A peptide consisting of five amino acids....
PEP: The abbreviation PEP stands for a number of things in medicine including post-exposure prophylaxis. Prophylaxis means a defense or protection.
Post-exposure prophylaxis, for example, might concern the treatment of a health care worker exposed by a needle stick to HIV with a drug such as AZT to ...
Peptic ulcer: A hole in the lining of the stomach, duodenum, or
esophagus. A peptic ulcer of the stomach is called a gastric ulcer, an ulcer of the
duodenum is a duodenal ulcer, and a peptic ulcer of the esophagus is an esophageal ulcer.
A peptic ulcer occurs when the lining of these organs is corro...
Peptidase: An enzyme that can break down a peptide into its component amino acids....
Peptide: A molecule consisting of 2 or more amino acids. Peptides are smaller than proteins, which are also chains of amino acids. Molecules small enough to be synthesized from the constituent amino acids are, by convention, called peptides rather than proteins. The dividing line is at about 50 amin...
Peptidomimetic: A compound that mimics the biological action of a peptide....
Peptidyl-prolyl cis/trans isomerase
Peptidyl-prolyl cis/trans isomerase: An enzyme also known as Pin1. See: Pin1....