Fig. 2From: Systemic distribution of medullary bone in the avian skeleton: ground truthing criteria for the identification of reproductive tissues in extinct AvemetatarsaliaExtent and pattern of MB skeletal distribution in all 40 specimens sampled. The extent of MB skeletal distribution is expressed in % of skeletal regions containing MB. The specimens are classified following the phylogeny of Prum et al. [52]. The skeletal scheme used here is representative of the general bird skeleton depicting all considered elements, regardless of the speciesBack to article page