OBO_REL:part_of (UNDECLARED) hemal arch hemal prezygapophysis 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 prezygopophyses. TAO:0001380 TAO:0007005 haemal prezygapophysis hemal prezygopophysis teleost_anatomy endochondral bone