BRAIN Section No. 68

Form and size of the brain at stage 13.

Text and Drawing adapted from Fig 13-10 of O'Rhailly, R., and Müller, F.. Developmental Stages in Human Embryos, Carnegie Institution of Washington, Publication 637, 1987.]

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Various neural areas are indicated according to current interpretations. A section (at higher magnification) through the midbrain at the level marked A-B shows the appearance of the neural wall at this time.Based on reconstructions by Osborne O. Heard.