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. A Gyneco logist is a physician that specializes in the treatment of female diseases and disorders. Gerontology is the study of the elderly.