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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: Am J Obstet Gynecol. 2014 Jul 11;212(2):145–156. doi: 10.1016/j.ajog.2014.07.003

Figure 1.

Figure 1

Transvaginal ultrasonography (left) to assess a cervix (middle), [illustration by James A. Cooper, M.D., San Diego, CA in Callen (2008)36], showing cervical effacement and funneling (right)37 [reproduced with permissions from Elsevier and the American Institute of Ultrasound in Medicine].