For spinal anesthesia and epidural anesthesia needles go through what layers from the skin to the anesthesia site?

When the dilatation of the cervix is 2-3 cm, the pregnant woman is placed in the left lateral decubitus position with both knees flexed to the chest, and the epidural space is successfully punctured in the L2-3 or L3-4 space. In the hollow core, pierce the subarachnoid space, and slowly inject 2.5ug of fentanyl, 2.5mg of bupivacaine, 20mg of ephedrine, 0.25g of glucose, and a total of 1.33ml during the uterine contraction. Take out the long needle and set it quickly. Into the epidural catheter, connected to the microinjection pump. The level of anesthesia is controlled below T10. When the effect of spinal anesthesia is weakened, the anesthetic liquid (0.075 percent bupivacaine 50ml plus fentanyl 50ug. cervix) is pumped into the epidural space with a microinjection pump at a rate of 10ml per hour. Stop the injection after it is fully opened.

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