A haemal arch (also spelled hemal arch) is a bony arch on the ventral side of a tail vertebra of a vertebrate. The canal formed by the space between the arch and the vertebral body is the haemal canal. A spinous ventral process emerging from the haemal arch is referred to as the haemal spine.
Blood vessels to and from the tail run through the arch.
- S. N. Prasad; Vasantika Kashyap (1 January 1989). A Textbook of Vertebrate Zoology. New Age International. p. 97. ISBN 978-0-85226-928-2.
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