Waldeyer’s ring Health Dictionary

Waldeyer’s Ring: From 1 Different Sources


Ringworm

See tinea.... ringworm

Ring Block

A local anaesthetic agent (see ANAESTHESIA) injected into the circumference of the base of a digit. It numbs the nerves of the ?nger or toe and so permits minor surgery to be performed. Care must be taken to avoid damage to local blood vessels which can lead to GANGRENE.... ring block

Blue-ringed Octopus

Colloquial term for Hapalochlaena spp.... blue-ringed octopus

Ring-fencing

Reserving money to be spent for a particular service, such as grants to local authorities.... ring-fencing

Ringing In The Ears

See tinnitus.... ringing in the ears

Bandl’s Ring

see retraction ring. [L. Bandl (1842–92), German obstetrician]... bandl’s ring

Corneal Ring

a ring designed to be inserted into the peripheral tissue of the cornea in order to alter the curvature of the corneal surface. It is undergoing trials to assess its ability to correct errors of refraction. In myopia (short-sightedness), for example, the ring would be required to stretch the corneal tissue peripherally and thus flatten the central corneal curvature in order to correct the myopia.... corneal ring

Fleischer Ring

a deposit of iron in the form of a ring in the epithelium of the cornea, which is seen, for example, around the base of the ‘cone’ of the cornea in *keratoconus. It is best visualized using cobalt blue light. [B. Fleischer (1848–1904), German physician]... fleischer ring

Hollister Ring

a watertight adherent ring placed around an intestinal *stoma and incorporating a flange to which a disposable plastic bag could be attached. It was the forerunner of modern disposable stoma bags.... hollister ring

Kayser–fleischer Ring

a brownish-yellow ring in the outer rim of the cornea of the eye. It is a deposit of copper granules and is diagnostic of *Wilson’s disease. When well developed it can be seen by unaided observation, but faint Kayser-Fleischer rings may only be detected by specialized *slit-lamp ophthalmological examination. [B. Kayser (1869–1954), German ophthalmologist; B. Fleischer (1848–1904), German physician]... kayser–fleischer ring

Retraction Ring

a depression in the uterine wall marking the junction between the actively contracting muscle fibres of the upper segment of the uterus and the muscle fibres of the lower segment. This depression is not always visible and is normal. In obstructed labour (e.g. contracted pelvis or malposition of the fetus resulting in shoulder presentation), the muscle fibres of the upper segment become shorter and thicker; the muscle fibres of the lower segment, on the other hand, become elongated and thinner. The junction between the two becomes more distinct as it rises into the abdomen from the pelvis. This abnormal ring is known as Bandl’s ring and is a sign of impending rupture of the lower segment of the uterus, which becomes progressively thinner as Bandl’s ring rises upwards. Immediate action to relieve the obstruction is then necessary, usually in the form of Caesarean section.... retraction ring

Ring

n. (in anatomy) see annulus.... ring

Ringer’s Solution

(Ringer’s mixture) a clear colourless *physiological solution of sodium chloride (common salt), potassium chloride, and calcium chloride prepared with recently boiled pure water. The osmotic pressure of the solution is the same as that of blood serum. Ringer’s solution is used for maintaining organs or tissues alive outside the animal or human body for limited periods. Sterile Ringer’s solution may be injected intravenously to treat dehydration. [S. Ringer (1835–1910), British physiologist]... ringer’s solution

Schatzki Ring

a ringlike constriction in the lower part of the gullet (oesophagus). The cause is unclear. Patients may be asymptomatic or experience episodic difficulty in swallowing. Diagnosis is made at gastroscopy or *barium swallow. Antisecretory agents and endoscopic balloon dilatation are reserved for symptomatic patients. [R. Schatzki (20th century), German-born US physician]... schatzki ring

Weiss Ring

a ringlike opacity on the posterior vitreous surface, arising as a result of a posterior *vitreous detachment. It is seen as a ring-shaped *floater.... weiss ring



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