Question

how is descovered injection

Answer 1

Francis ryend first he discovered the injection ..

Answer 2

1844: Irish physician Francis Ryndinvented the hollow needle and used it to make the first recorded subcutaneous injections, specifically a sedative to treat neuralgia. 1853: Charles Pravaz and Alexander Wooddeveloped a medical hypodermic syringe with a needle fine enough to pierce the skin.