hemal arch


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Noun1.hemal arch - a structure arising ventrally from a vertebral centrum and enclosing the caudal blood vessels
centrum - the main body of a vertebra
arch - a curved bony structure supporting or enclosing organs (especially the inner sides of the feet)
References in periodicals archive ?
Hemal arch was observed at [Ca.sub.6] and hemal processes from [Ca.sub.7] (Figure 3(d)).
The third gonapophys presents no clearly developed process, however the area between the body and the hemal arch forms an obtuse angle with a notable, sharp apex.
Monod proposed the fusion of preural centra 2 and 3 (PU2 + PU3) in another species of the same genus, Syngnathus acus, on the evidence of two hemal arches under the same vertebral centrum.