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.

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Look at other dictionaries:

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  • 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

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

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