The four sons of Horus are: Hapi, Imsety, Duamutef, and Qebehsenuef.
Hapi protected the lungs of the deceased, and was protected by the goddess Nephthys. Imsety protected the liver of the deceased, and was protected by the goddess Isis. Duamutef protected the stomach of the deceased, and was protected by the goddess Neith. Finally, Qebehsenuef protected the intestines of the deceased, and was protected by the goddess Serket.