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one of the cartilaginous structures surrounding the caudal vein in the tail of the vertebrate embryo, formed by the ventrad growth of the ventrolateral arcualia. In fish, the arches are also present in the thoracic region. Cf. neural a.Medical dictionary. 2011.
Hemal arch — Hemal He mal, a. [Gr. a i^ma blood.] Relating to the blood or blood vessels; pertaining to, situated in the region of, or on the side with, the heart and great blood vessels; opposed to neural. [1913 Webster] Note: As applied to vertebrates,… … The Collaborative International Dictionary of English
hemal arch — noun a structure arising ventrally from a vertebral centrum and enclosing the caudal blood vessels • Syn: ↑haemal arch • Hypernyms: ↑arch • Part Holonyms: ↑centrum * * * noun : a bony or cartilaginous arch extending ventrally from the spinal… … Useful english dictionary
hemal arch — haemal arch … Dictionary of ichthyology
Hemal — He mal, a. [Gr. a i^ma blood.] Relating to the blood or blood vessels; pertaining to, situated in the region of, or on the side with, the heart and great blood vessels; opposed to neural. [1913 Webster] Note: As applied to vertebrates, hemal is… … The Collaborative International Dictionary of English
hemal canal — the space within the hemal arch … Medical dictionary
hemal spine — a ventral projection from the hemal arch, which is attached to the underside of certain vertebral centra in lower vertebrates … Medical dictionary
arch — Any structure resembling a bent bow or an a.; an arc. In anatomy, any vaulted or archlike structure. See arcus. SYN: arcus [TA]. [thru O. Fr. fr. L. arcus, bow] abdominothoracic a. a bell shaped line defined by the lower end of the sternum and… … Medical dictionary
haemal arch — noun a structure arising ventrally from a vertebral centrum and enclosing the caudal blood vessels • Syn: ↑hemal arch • Hypernyms: ↑arch • Part Holonyms: ↑centrum … Useful english dictionary
Neural arch — Neural Neu ral, a. [Gr. ney^ron nerve.] (Anat. & Zo[ o]l.) relating to the nerves or nervous system; taining to, situated in the region of, or on the side with, the neural, or cerebro spinal, axis; opposed to {hemal}. As applied to vertebrates,… … The Collaborative International Dictionary of English
neural arch — n the cartilaginous or bony arch enclosing the spinal cord on the dorsal side of a vertebra called also vertebral arch * * * see vertebra * * * one of the cartilaginous structures surrounding the embryonic spinal cord, formed by the dorsad growth … Medical dictionary
