(redirected from mitral ring)
Also found in: Dictionary, Thesaurus, Financial, Encyclopedia.


1. any annular or circular organ, structure, or area.
2. in chemistry, a collection of atoms united in a continuous or closed chain.
abdominal ring, external an opening in the aponeurosis of the external oblique muscle for the spermatic cord or round ligament.
abdominal ring, internal an aperture in the transverse fascia for the spermatic cord or round ligament.
Albl's ring a ring-shaped shadow in radiographs of the skull, caused by aneurysm of a cerebral artery.
Bandl's ring see bandl's ring.
benzene ring the hexagon representing the arrangement of carbon atoms in a molecule of benzene, different compounds being derived by replacement of the hydrogen atoms by different elements or compounds.
Cannon's ring a focal contraction seen radiographically at the mid-third of the transverse colon, marking an area of overlap between the superior and inferior nerve plexuses.
conjunctival ring a ring at the junction of the conjunctiva and cornea.
constriction ring a contracted area of the uterus, where the resistance of the uterine contents is slight, as over a depression in the contour of the fetus, or below the presenting part.
fibrous ring of heart anulus fibrosus.
halo ring a metal orthosis used for traction in the treatment of spinal cord injuries. The halo apparatus can maintain stability and alignment of the cervical vertebrae while the patient is out of bed.
inguinal ring, deep an aperture in the transverse fascia for the spermatic cord or the round ligament.
inguinal ring, external superficial inguinal ring.
inguinal ring, internal deep inguinal ring.
inguinal ring, superficial an opening in the aponeurosis of the external oblique muscle for the spermatic cord or the round ligament.
Kayser-Fleischer ring a golden brown or green discoloration in the zone of Descemet's membrane in the limbic region of the cornea seen in wilson's disease and other liver disorders.
pathologic retraction ring a complication of prolonged labor marked by failure of relaxation of the circular fibers at the internal opening of the cervix, obstructing delivery of the infant. See also bandl's ring.
physiologic retraction ring the demarcation between the upper, contracting portion of the uterus in labor and the lower, dilating part.
Schwalbe's ring a circular ridge composed of collagenous fibers surrounding the outer margin of Descemet's membrane.
tympanic ring the bony ring forming part of the temporal bone at birth and developing into the tympanic plate.
umbilical ring the orifice in the abdominal wall of the fetus for transmission of the umbilical vein and arteries.
vascular ring a congenital anomaly of the aortic arch and its tributaries, the vessels forming a ring about the trachea and esophagus and causing varying degrees of compression.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


(ring), [TA]
1. A circular band surrounding a wide central opening; an anular or circular structure surrounding an opening or level area. Synonym(s): anulus [TA]
2. The closed (that is, endless) chain of atoms in a cyclic compound; commonly used for "cyclic" or "cycle."
3. A marginal growth on the upper surface of a broth culture of bacteria, adhering to the sides of the test tube in the form of a circle.
Synonym(s): anulus
[A.S. hring]
Farlex Partner Medical Dictionary © Farlex 2012
A 40-to-60 residue zinc-finger domain macromolecular protein consensus sequence which contains a Cys3HisCys4 amino acid motif that binds two zinc cations, and mediates protein-protein interactions—e.g., with E2 enzyme. They are the specificity determinants for cellular ubiquination and associated with certain transcription factors—e.g., TIF1b, the PML-family, NFX1, XPRF
RING is an acronym for Really Interesting New Gene
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


(ring) [TA]
1. Anular or circular structure surrounding an opening or level area.
Synonym(s): anulus [TA] .
2. anatomy Anulus.
3. The closed chain of atoms in a cyclic compound; commonly used for "cyclic" or "cycle."
4. A marginal growth on the upper surface of a broth culture of bacteria, adhering to the sides of the test tube in the form of a circle.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


Any line, object or structure that is circular in shape.
anterior limiting ring of Schwalbe A bundle of connective tissue and elastic fibres forming the junction between the anterior termination of the trabecular meshwork and Descemet's membrane of the cornea. If it is unusually thickened or prominent, it is called posterior embryotoxon. Syn. line of Schwalbe. See direct gonioscopy; Axenfeld's syndrome; Rieger's syndrome.
Coat's white ring A small, oval or circular, whitish-grey ring opacity in the cornea found at the level of Bowman's layer, usually near the periphery. It is composed of a deposition of iron, possibly located at the site of a previous foreign body injury. No treatment is necessary. See iron line.
Fleischer's ring A narrow ring of brownish or greenish pigment containing iron, deposited in the epithelium of the cornea and surrounding (completely or partially) the base of the cone in keratoconus. It is not always present in that disease. Syn. Fleischer's line. See iron line.
Kayser-Fleischer ring A ring of pigment granules containing copper located in Descemet's membrane around the periphery of the cornea. It has a brown or greyish-green colour to the unaided eye or golden brown to reddish colour when viewed through the slit-lamp and appears in nearly all cases of Wilson's disease.
Landolt ring See Landolt ring.
Newton's ring's Circular, concentric interference fringes surrounding a point of contact when two glass surfaces are pressed together. The thicker the air film separating the two surfaces the greater the number of concentric rings.
scleral ring The appearance of a white patch of sclera adjacent to the optic disc when the retinal pigment epithelium and the choroid do not extend to the optic disc.
r . scotoma See ring scotoma.
Soemmering's ring Lens remnants found within the periphery of the capsular bag. It may occur as a result of trauma, but more commonly following extracapsular cataract extraction. The pupillary area is usually left relatively free. See after-cataract; Elschnig's pearls.
Vossius' ring An annulus-shaped opacity imprinted on the anterior lens capsule and containing pigment from the posterior epithelium of the iris. It occurs as a result of a blunt trauma to the eye in which the aqueous pressure throws the iris forcefully against the lens. The ring is usually located sufficiently off-axis not to impair vision.
Wessley ring A disc-shaped greyish opacity made up of inflammatory cells consisting of antigen-antibody complexes located in the corneal stroma. It is seen in stromal interstitial keratitis resulting from a herpes simplex virus or disciform keratitis. The ring may attract neovascularization. Syn. immune ring of Wessley.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann


(ring) [TA]
1. Circular band surrounding a wide central opening; anular or circular structure surrounding an opening or level area.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about ring

Q. What causes high pitch ringing in one ear?

A. I never knew that about Iron. Thank you F3_4u

Q. Tinnitus (Ringing and Other Ear Noise) Anybody have this problem? Urrrrrrrrrrr, I think I want to shoot myself,you know what I mean. It is worst than the chinese torture. Someone, please send me a good tip how to stop it. I have this for 4 yrs and it is driving me crazy. You cannot enjoy total complete silence. They say silence is golden but not when you have this ringgi in your ears. It gets worst when there is no noise. The only remedy I have is eating hot spicy curry, it helps for 2-3 wks and then it comes back again and then eating spicy food again. Listening to classical music helps to. Oh well.....just have to suck it up.

A. I've read that lipoflavinoids can help.

Q. How do you wake up in the morning if your narcolepsy is so severe you can't hear the alarm clock, phone ring? biggest problem is sleep paralysis, can't wake up. Late for work, everything, life is suffering because of severity. Have tried ritalin, natural supplements, hypnosis therapy, Provigal, antidepressants, nothing seems to work. Employer thinks it's an excuse, friends are irritated, I'm at my wits end. Life is spent sleeping more than awake.

A. Narcolepsy cannot yet be cured. But EDS and cataplexy, the most disabling symptoms of the disorder, can be controlled in most patients with drug treatment. Often the treatment regimen is modified as symptoms change. For decades, doctors have used central nervous system stimulants-amphetamines such as methylphenidate, dextroamphetamine, methamphetamine, and pemoline-to alleviate EDS and reduce the incidence of sleep attacks. For most patients these medications are generally quite effective at reducing daytime drowsiness and improving levels of alertness. However, they are associated with a wide array of undesirable side effects so their use must be carefully monitored. Common side effects include irritability and nervousness, shakiness, disturbances in heart rhythm, stomach upset, nighttime sleep disruption, and anorexia. For full article: http://www.ninds.nih.gov/disorders/narcolepsy/detail_narcolepsy.htm#120393201 Hope this helps.

More discussions about ring
This content is provided by iMedix and is subject to iMedix Terms. The Questions and Answers are not endorsed or recommended and are made available by patients, not doctors.