Embryology is the study of early or developmental stages of life. Fetal development would be a topic of embryology. A person studying embryology was be called a embryo logist. Physiology is the study of the function of the body. One who studies physiology is called a physio logist.
Pathology is the study of disease.
A patho logist is a physician that specilizes in the study of disease. Neurology is the study of the bodies nervous system. A Neuro logist is a physician that specilizes in treating nervous system disorders. A Neuro surgeon is a physician who specializes in the surgery of the nervous system, such as brain or spinal cord surgery. Gynecology is the study of the female.