Hem bow
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Hemal arches , also called hemal ribs or hemapophyses , are ventral (ventrally oriented) ribs of the caudal spine. Fish have ribs on all vertebrae . Two ribs form an arch at the front, followed by the hemal arches at the back. They are fused in a Y-shape and form the hemal canal under the spine , through which a large blood vessel leads. The extension at the point where the two arches merge is called a hemalthorn . Terrestrial vertebrates (Tetrapoda) have no hemostats, or rather they are only present on the anterior caudal vertebrae. If present, the size of the hemal arches decreases towards the back.
See also : chevron bones
source
- Lexicon of Biology. Volume 4, Herder Verlag, ISBN 3-451-19644-1