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. Author manuscript; available in PMC: 2019 Oct 1.
Published in final edited form as: Best Pract Res Clin Obstet Gynaecol. 2018 Apr 11;52:88–102. doi: 10.1016/j.bpobgyn.2018.03.007

FIGURE 4:

FIGURE 4:

Images adapted from Yao et al showing optical coherence tomography images of a transverse slice of human nonpregnant cervical tissue at level of internal os showing there is an outer zone of circumferentially oriented collagen fibers. (11)