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Parous and nonparous cervix

(A) Normal nulligravid cervix. The external os is a small, smooth, circular opening.
(B) Normal parous cervix. The external os is a large, transverse, stellate slit.

Modified from: Pritchard JA, MacDonald PC. Williams Obstetrics, 16th ed, Appleton-Century-Crofts, Prentice Hall, New York 1981. p.23.

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