The first lumbar vertebra is quickly positioned, there are three main methods: 1, determine the twelfth thoracic vertebra, count down one vertebra is the first lumbar vertebra, the twelfth thoracic vertebra first to find the twelfth rib, the twelfth rib is the lowermost free rib of the human body, by touching after, along the rib can find the twelfth thoracic vertebra, count down one is the first lumbar vertebra. 2, first find the fourth lumbar vertebra, the fourth lumbar vertebra The spine of the fourth lumbar vertebra is in a straight line with the highest point of the iliac crest of the human pelvis, so after finding the spine of the fourth lumbar vertebra and counting three vertebrae upward, it is the first lumbar vertebra. 3, find the spine of the seventh cervical vertebra, this position is at the highest point of the cervical vertebra, after touching it and counting three vertebrae downward, it is the first lumbar vertebra.