Fig. 4From: Sequence of chondrocranial development in basal anurans—Let’s make a craniumD. scovazzi, cartilaginous development of the palatoquadrate and its components. Transverse histological sections of Stage A4 (first column), Stage D2 (second column), Stage D4 (third column), Stage C2 (fourth column) and Stage C4 (fifth column) show the chondrification process of the quadratocranial commissure, the muscular process, the subocular bar and the ascending process. Difficult observable structures are highlighted by dashed lines. Scale bars indicate 100 μmBack to article page