Fig. 5
From: From Devo to Evo: patterning, fusion and evolution of the zebrafish terminal vertebra
Zebrafish terminal vertebra assembly model. The model considers eight steps on the formation of the zebrafish terminal vertebra, divided between phases of patterning, fusion and differential growth. Arrows indicate direction of growth. The red arrowhead on the last panel points to the lateral middle ridge or crest. Terminology: H1–3, hypurals 1 to 3; mr, middle ridge; naPU1, neural arch of the preural centrum 1; naU1–2, neural arch of the ural centra 1 and 2; PH, parhypural; PL, pleurostyle; PU2, preural centrum 2; U1–3, ural centra 1 to 3; Un, uroneural