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The following 3 entries include the term collateralartery.
inferior ulnar collateral artery
noun: a small artery that arises from the brachial artery just above the elbow and divides to form or gives off branches that anastomose with other arteries in the region of the elbow compare superior ulnar collateral artery
superior ulnar collateral artery
noun: a long slender artery that arises from the brachial artery or one of its branches just below the middle of the upper arm, descends to the elbow following the course of the ulnar nerve, and terminates under the flexor carpi ulnaris by anastomosing with two other arteries compare inferior ulnar collateral artery
ulnar collateral artery
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Merriam-Webster unabridged
