constriction ring

constriction ring
1. a contracted area of the uterus, allegedly possible at any level, occurring where the resistance of the uterine contents is slight, as over a depression in the contour of the fetal body, or below the presenting part. Cf. retraction r. 2. contractile r.

Medical dictionary. 2011.

Поможем сделать НИР

Look at other dictionaries:

  • constriction ring — The equatorial ring of microfilaments that diminishes in diameter probably both by contraction and disassembly as cytokinesis proceeds …   Dictionary of molecular biology

  • constriction ring dystocia — contraction ring dystocia dystocia caused by contraction of an area of circular muscle fibers, which may occur at various levels of the parturient uterus …   Medical dictionary

  • ring — 1. A circular band surrounding a wide central opening; a r. shaped or circular structure surrounding an opening or level area. SYN: anulus [TA]. 2. The closed ( i.e., endless) chain of atoms in a cyclic compound; commonly used for “cyclic” or… …   Medical dictionary

  • contractile ring — See constriction ring …   Dictionary of molecular biology

  • 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 …   Medical dictionary

  • Schatzki ring — Schatz·ki ring shats kē or Schatz·ki s ring kēz n a local narrowing in the lower part of the esophagus that may cause dysphagia Schatzki Richard (1901 1992) American radiologist. Schatzki held positions in radiology at several Boston hospitals. * …   Medical dictionary

  • contractile ring — a narrow band of actin filaments and myosin II, encircling the equator of a dividing cell, that pinches in to separate the daughter cells from one another. Called also constriction r …   Medical dictionary

  • contraction ring — see constriction r. and retraction r …   Medical dictionary

  • band — 1. Any appliance or part of an apparatus that encircles or binds a part of the body. SEE ALSO: zone. 2. Any ribbon shaped or cordlike anatomic structure that encircles or binds another structure or that connects two or more parts. See fascia,… …   Medical dictionary

  • eye, human — ▪ anatomy Introduction  specialized sense organ capable of receiving visual images, which are then carried to the brain. Anatomy of the visual apparatus Structures auxiliary to the eye The orbit       The eye is protected from mechanical injury… …   Universalium

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”