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Midline MR images of the fetal tarsier skull at (a) 29.2 mm, (b) 48.6 mm and (c) 62.4 mm crown–rump length. These illustrate that the basicranium gradually ossifies from basioccipital (bo), basisphenoid (bs) and presphenoid (ps) centres and that the mesethmoid (ms) also gradually ossifies and is continuous with the nasal septum (ns). Not to scale.
