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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One of the articular faces for the haemal arch (chevron) has been preserved in the left posterior region, which obliquely truncates the ventral ridge, as described by Andrews (1913).
The centrum is readily differentiated into four intermedialia by the basidorsal and basiventral insertions for the neural and haemal arch cartilages (Fig.
These include: a very narrow, splinter-like metapterygoid; short slender gill rakers on the lower limb of the first arch; a short papillae row b, never extending to posterior of the pupil; a modified first haemal arch; the caudal fin elongate but with the upper rays 3,4,5 shorter than the corresponding rays on the ventral half of the fin, forming a notch in the upper margin of the fin.
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.
Abdominal/caudal vertebral pattern is Type B, but haemal arch of second caudal vertebra is somewhat enlarged.
First haemal arch not expanded, abdominal/caudal vertebral transition of Type B (Winterbottom & Zur 2007: Fig.
2); the spine of the first haemal arch which inserts between the 4th and 5th anal pterygiophores in AUBM OS 3672 (between 3rd and 4th in AUBM OS 3673); and all fins were lightly freckled with melanophores.
The haemal arches developed subsequently at 3.78 +- 0.08 mm (11-12 DPH, Fig.
Anterior parapophyses small, directed laterally, anteroposterior series becoming larger, directed posteriorly to form haemal arches of caudal vertebrae.
At dig's end, three weeks later, museum staff returned to Brisbane with 15-20 bones, including vertebrae, haemal arches, an ankle bone and part of a hip bone.
However, systematic deposits of calcium phosphate have also been found in chondrocranium, jaws, visceral arches, fin cartilage, claspers, neural and haemal arches (Clement, 1992).