Microinjection
（重定向自Microinjector）
![Microinjection of a fluorescent dye into Ciona intestinalis eggs positioned in a microwell array.](/Images/godic/202501/27/-3D-Printed-Microwell-Arrays-for-Ciona-Microinjection-and-Timelapse-Imaging-pone.0082307.s003.ogv3623.jpg")
![A microinjection controller designed by Tritech Research for controlling the pressure applied to a hollow glass needle with a microscopic tip, placed in a brass needle holder, to regulate the delivery of substances like DNA into cells, stem cells into embryos, and sperm into eggs.](/Images/godic/202501/27/Microinjector_microinjection_controller3623.jpg")
![Diagram of the intracytoplasmic sperm injection of a human egg. Micromanipulator on the left holds egg in position while microinjector on the right delivers a single sperm cell.](/Images/godic/202501/27/Microinjection_of_a_human_egg.svg3623.png")
Microinjection is the use of a glass micropipette to inject a liquid substance at a microscopic or borderline macroscopic level. The target is often a living cell but may also include intercellular space. Microinjection is a simple mechanical process usually involving an inverted microscope with a magnification power of around 200x (though sometimes it is performed using a dissecting stereo microscope at 40–50x or a traditional compound upright microscope at similar power to an inverted model).