collateral 1 In anatomy, a subordinate or accessory part. 2 A side branch, as of a blood vessel or nerve. After a coronary artery occlusion, collateral vessels often develop to shunt blood around the blockage.
collateral 1 In anatomy, a subordinate or accessory part. 2 A side branch, as of a blood vessel or nerve. After a coronary artery occlusion, collateral vessels often develop to shunt blood around the blockage.