ABSTRACT
This specimen is a stillborn fetus of undetermined sex (Yakovlev case number BR-15-63, referred to here as Y15-63). The age was originally estimated to be at gestational week (GW) 19, but the crown rump length (CR 150 mm) and the general level of brain maturation place it more probably at GW17. The brain was cut in the coronal (frontal) plane in 979 35-μm thick sections and is classified as a Normative Control in the Yakovlev Collection (Haleem, 1990). Since there is no photograph of this brain before it was embedded and cut, we turned to comprehensive atlas that Retzius published in 1896 showing whole fetal brains in medial, lateral, superior, and inferior views and midline sagittally cut brains. Figure 6 , taken from Retzius (1896), shows the exterior of a brain from a specimen that is at the same age as Y15-63, along with the approximate cutting angle of the sections.
