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the appearance of the sclera adjacent to the optic disc when the retinal pigment epithelium does not extend to the optic nerve.
scle·ral ring(skērăl ring)
Scleral appearance adjacent to the optic disc when retinal pigment epithelium does not extend to the optic nerve.
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. Called also external inguinal ring.
abdominal ring (internal)
an aperture in the transverse fascia for the spermatic cord or round ligament. Called also internal inguinal ring.
see bandl's rings.
an immature granulocyte, intermediate between the myelocyte and metamyelocyte, found in the bone marrow of rats. There is a 'hole' in the nucleus.
the posterior part of the ciliary body of the eye, a continuation of the choroid.
a ring at the junction of the conjunctiva and cornea.
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.
deep inguinal ring
an aperture in the transverse fascia for the spermatic cord or the round ligament.
the abdominal opening of the femoral canal through which the femoral nerve and blood vessels pass from the peritoneal cavity to the limb.
see abdominal ring (above).
the ring in the pancreas that accommodates the portal vein.
ring precipitin test
see precipitin reaction.
the rim of the external orifice of the prepuce proper, the internal prepuce, on the penis of the horse.
the demarcation between the upper, contracting portion of the uterus in normal parturition and the lower, dilating part.
retraction ring (pathological)
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 fetus.
see schwalbe's ring.
see ring of ossicles.
a rubber ring fitted over the glans penis of the stallion which discourages erection and masturbation.
superficial inguinal ring
a fissure-like opening in the aponeurosis of the external abdominal oblique muscle for the spermatic cord or the round ligament.
see ascoli test.
the bony ring forming part of the temporal bone at birth and developing into the tympanic plate.
the orifice in the abdominal wall of the fetus for transmission of the umbilical vein and arteries.
vaccination of all animals in a zone around an area in which the subject disease occurs. A preventive strategy that contains the infected population so that the eradication team has a finite target.
any of a number of congenital anomalies of the aortic arch and its branches, the vessels forming a ring about the trachea and esophagus that cause varying degrees of compression, vomiting and esophageal dilatation. See also persistent right aortic arch.