Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «P»:
Periosteum: The periosteum is a dense membrane composed of
fibrous connective tissue that closely wraps (invests) all bone,
except that of the articulating surfaces in joints which are covered
by a synovial membrane.
"Peri-" is a prefix borrowed from the Greek meaning "around or
about" and "-os...
Periostitis: Inflammation of the periosteum, a
dense membrane composed of
fibrous connective tissue that closely wraps (invests) all
bone, except the
bone of articulating surfaces in joints which are covered
membranes. The word "periotitis" may seem like Greek to
you. "Peri-" is a
Periostoma: A benign tumor arising from the
periosteum, the dense membrane
composed of fibrous connective tissue that closely wraps
(invests) all bone
(except the articular surfaces of bone in joints which are
Peripheral: Situated away from the center, as opposed to
centrally located. For example, peripheral vision means the type
of vision that allows one to see objects that are not in the center
of one's visual field.
The word "peripheral" comes from the Greek "peripheria" ("peri-",
around or about +...
Peripheral artery disease
Peripheral artery disease: A form of peripheral vascular disease in which there is partial or total blockage of an artery, usually one leading to a leg or arm. Leg artery disease and arm artery disease are somewhat different.
Leg artery disease is usually due to atherosclerosis. Fatty deposits buil...
Peripheral blood stem cell transplantation
Peripheral blood stem cell transplantation: A new
technique in which stem cells are obtained
from a patient's blood and used in bone marrow transplantation.
Stem cells are small, round cells with a squat nucleus and scant
surrounding cytoplasm. Although unremarkable in appearance, stem
cells can ...
Peripheral insulin resistance
Peripheral insulin resistance: Failure of target tissues to increase glucose disposal in response to insulin. See also: Insulin resistance....
Peripheral iridectomy: A surgical procedure in which a hole is made in the periphery (outer part) of the iris by removing a full-thickness piece from the iris in order to treat a specific type of glaucoma called narrow-angle glaucoma (or angle-closure glaucoma)....
Peripheral nervous system
Peripheral nervous system (PNS): That portion of the nervous system that is outside the brain and spinal cord.
The peripheral nervous system (PNS) is one of the two major divisions of the nervous system. The other is the central nervous system (CNS) which is made up of the brain and spinal cord.
Peripheral neuropathy: A problem with the functioning of the
nerves outside the spinal cord. Symptoms may include numbness, weakness, burning pain (especially at night), and loss of reflexes. There are many causes of peripheral neuropathy, including
diabetes, certain drugs, kidney failure, and vita...
Peripheral pulmonary stenosis with cholestasis
Peripheral pulmonary stenosis with
cholestasis: Also known as arteriohepatic dysplasia
or Alagille syndrome, this ia a genetic disorder
characterized by jaundice in the newborn period, liver
disease with cholestasis, peripheral pulmonic stenosis and
unusual face. Children with Alagille syndro...
Peripheral vascular disease
Peripheral vascular disease: A disease of blood vessels outside the heart. Peripheral vascular disease (PVD) affects the peripheral circulation, as opposed to the cardiac circulation. PVD comprises diseases of both peripheral arteries and peripheral veins. PVD is sometimes incorrectly used as a syno...
Peripheral vision: Side vision. The ability to see objects
and movement outside of the direct line of vision. Peripheral vision is the work of the rods, nerve cells located largely outside the macula (the center) of the retina. The rods are also responsible for night vision and low-light vision but...
Periphery: 1. The outside or surface of a structure; the portion outside the central region.
2. The circumference of a circle or other geometric figure....
Peristalsis: The rippling motion of muscles in the digestive
tract. In the stomach, this motion mixes food with gastric juices, turning it into a thin