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XVIII.20 Model of disengagement of the head in vertex presentation
Author: unknown
Place:Florence
Date:1770-1775
Materials:terracotta
Dimensions:220x350x340 mm
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This terracotta teaching model shows the disengagement of the head in vertex presentation, i.e., the expulsion stage of labor, in which the occiput is rotated forward and the head, now disengaged, moves below the pubis. The head pushes the perineum in front of it. Simultaneously, the coccyx is pushed backward and the posterior perineal region, lying between the anus and the tip of the coccyx, is everted. These movements are needed to adjust the different possible diameters of the presenting head to the pelvic diameters. The model was commissioned by Giuseppe Galletti.

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