Skip Navigation
Stage 1 / 1 day Stage 2 / 2-3 days Stage 3-1 / 4 days Stage 3-2 / 4-5 days Stage 4 / 6 days Stage 5a-1 / 7 days Stage 5a-2 / 8 days Stage 5b / 9 days Stage 5c / 12 days Stage 6 / 13-17 days Stage 7 / 16-19 days Stage 8 / 23 days Stage 9 / 25 days Stage 10 / 28 days Stage 11 / 29 days Stage 12 / 30 days Stage 13 / 32 days Stage 14 / 33 days Stage 15 / 36 days Stage 16 / 39 days Stage 17 / 41 days Stage 18 / 44 days Stage 19 / 45-47 days Stage 20 / 49 days Stage 21 / 49-52 days Stage 22 / 52-55 days Stage 23 / 56 days
Carnegie Stage   Figure

Form and size of the brain at stage 13

Form and size of the brain at stage 13

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.

Text and Drawing adapted from Fig 13-10 of O'Rahilly and Müller, 1987.


Keywords: accessory nerve (CN XI), dorsal thalamus, facial nerve (CN VII), glossopharyngeal nerve (CN IX), mamillary recess, olfactory area, optic evagination, tectum, tegmentum, telencephalon medium, trigeminal nerve (CN V), vagus nerve (CN X), ventral thalamus, vestibulocochlear nerve (CN VIII)


Source: The Virtual Human Embryo.