Treating Physician Law and Legal Definition. A treating physician is defined as âsomeone who provides you, or has provided you, with medical treatment or evaluation and who has, or has had, an ongoing treatment relationship with you.
In the first four weeks from conception, fetal growth of the ovum begins with development of the spinal cord, nervous system, gastrointestinal system, heart and lungs. By eight weeks, in the embryonic stage, the face is forming, arms and legs move, the baby's heart begins beating and the brain and other organs form.
1 There are three stages of prenatal development: germinal, embryonic, and fetal. Prenatal development is also organized into three equal trimesters that do not correspond with the three stages.  The germinal stage occurs from conception until 2 weeks (implantation), during which the zygote begins to rapidly divide.