part of start stage end stage hemal arch endochondral bone hemal prezygapophysis haemal prezygapophysis zebrafish_anatomy hemal prezygopophysis ZFA:0007005 ZFA:0001380 TAO:0007005 Hemal prezygapophyses are paired, anteromedially directed processes arising from the bases of hemal arches, ligamentously joined to the hemal postzygapophyses of the preceding vertebra. Posterior caudal vertebrae close to the caudal fin lack hemal prezygapophyses. unknown adult