constriction ring


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Related to constriction ring: retraction ring

ring

 [ring]
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.

con·stric·tion ring

1. true spastic stricture of the uterine cavity resulting when a zone of muscle goes into local tetanic contraction and forms a tight constriction about some part of the fetus;
2. Synonym(s): amnionic band

con·stric·tion ring

(kŏn-strik'shŭn ring)
1. Spastic stricture of the uterine cavity resulting when a zone of muscle goes into local tetanic contraction and forms a tight constriction of some part of the fetus;
2. Synonym(s): amnionic band.
References in periodicals archive ?
This case highlights the successful use of an orthopedic oscillating saw to remove a constriction ring.
The syndrome exhibits different clinical manifestations at birth, such as constriction rings and limb and digital amputations, together with diverse craniofacial malformations and thoracic-abdominal wall anomalies [1,2].
The secret to these socks is no elastic - so there's no pinching round the calves or constriction rings. Instead, a special honeycomb top moulds to the natural contours of your leg to keep them smartly in place, and it is designed to help those who suffer from circulatory problems.