n. A ridge on the inner uterine surface at the boundary between the upper and lower uterine segments that occurs in the course of normal labor.

What is physiologic retraction ring?

Physiological Retraction Ring. It is a line of demarcation between the upper and lower uterine segment present during normal labour and cannot usually be felt abdominally.

What is the retraction ring?

Bandl's ring (also known as pathological retraction ring) is the abnormal junction between the two segments of the human uterus, which is a late sign associated with obstructed labor. Prior to the onset of labour, the junction between the lower and upper uterine segments is a slightly thickened ring.