The whole arm is full of veins and pumping with blood, why can’t they just inject it anywhere or move downwards, down the arm? Why do they HAVE to inject it in the beginning of the bicep/beginning of arm area?
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There are a couple reasons why the inner elbow is the perfect spot for most injections. First many larger veins run close to the surface without much tissue above them making finding the vein safer and less damaging. Next the inner elbow is a relatively protected spot that won’t be moving around or scraping against much if an needle needs to be left in for future administration of medicine.
Now that isn’t the only injection site. Many vaccines or other drugs are injected into the muscles. In emergencies various locations like the groin or neck can be used to access arteries and rapidly introduce medicine to the blood. We even occasionally have to use a medical drill to drill into the shin bone (Tibia) and inject medicine directly into the bone marrow.
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