haemal arch


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Noun1.haemal 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)
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sihama from Pakistan (14-4-16 (6), 14-5-15(4), 14-3-17(1)); the first haemal arch is very thin and easily broken in S.
The centrum is readily differentiated into four intermedialia by the basidorsal and basiventral insertions for the neural and haemal arch cartilages (Fig.
8): precaudal vertebrae 11; caudal vertebrae (including terminal element) 16; vertebrae 3-11 with pleural rib articulating with respective parapophyses; twelve pairs of epineurals, articulating with vertebrae as follows: epineurals 1, 2 with corresponding parapophyses, 3-10 with corresponding pleural ribs, epineural 11 reduced and not articulating with pleural rib and 12 highly reduced and embedded in tissue; first caudal vertebra with expanded haemal arch and tiny haemal spine; haemal arch comprising elongate parapophyses, "rib-like" in appearance in lateral view; where parapophyses join ventrally to form haemal arch, a nubbin of bone (haemal spine) projecting posteriorly (Fig.
First haemal arch emanating from first caudal vertebra, anterior parapophysis directed ventromedially to fuse with contralateral structure, produced as haemal spine.
Abdominal/caudal vertebral pattern is Type B, but haemal arch of second caudal vertebra is somewhat enlarged.