OBO_REL:part_of (UNDECLARED) parhypural hypurapophysis Lateral process, spine-like or crest-like, at the lateral wall of the haemal arch of the parhypural that serves for insertion of the hypochordal longitudinal muscle. The process may contribute to the lateral protection of the parhypural foramen (where the caudal blood vessels exit the hemal arch) and the hypural foramen (where a caudal heart may be present). The hypurapophysis is paired. TAO:0001028 The structure, the processus parhypurale, was given the name of hypurapophysis by Nursall (1963). Additional processes may be present on the lateral walls of hypurals 1 and 2 in some teleost subgroups. They are named primary, secondary hypurapophyses, etc. hypurapophyses parhypurapophyses parhypurapophyses processes teleost_anatomy process