Why do injections have to be in the ass?

It is best to pierce the buttocks for intramuscular injection, because the buttocks have the thickest muscles in the body, and there are fewer large blood vessels and nerves, but there are many small blood vessels, which is conducive to the absorption of the medicinal liquid. However, there is also hypertrophic subcutaneous fat on the buttocks. When injecting, the needle must pass through the fat layer and penetrate into the muscle. Especially for women, it is better to inject the needle deeper, otherwise the liquid will be injected into the fat, and the effect will not be good.

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