Anesthesiology Study of how to administer agents capable of bringing about loss of sensation and consciousness. Cardiology the branch of medicine dealing with the heart and its diseases Dermatology the branch of medicine dealing with the skin and its diseases Endocrinology the branch of medicine dealing with the endocrine glands and their secretions Andrology study of males (usually pertaining to diseases) Gastroenterology the branch of medicine that studies the gastrointestinal tract and its diseases Immunology the branch of medical science that studies the body's immune system Hepatology the study of the liver Gynecology the branch of medicine that deals with the diseases and hygiene of women, reproductive organ health Gerontology the branch of medical science that deals with diseases and problems specific to old people Nephrology study of the structure, function, and diseases of the kidneys Neurology the branch of medical science that deals with the nervous system and its disorders Oncology the branch of medicine concerned with the study and treatment of tumors Ophthalmology the branch of medicine concerned with the eye and its diseases Pathology the branch of medical science that studies the causes and nature and effects of diseases Serology the branch of medical science that deals with serums Otolaryngology study of the ear, throat, and larynx, and their diseases Podiatry the branch of medicine concerned with the feet Pediatrics the branch of medicine concerned with the treatment of infants and children Psychiatry the branch of medicine dealing with the diagnosis and treatment of mental disorders Pulmonology study of the lungs Rheumatology Medical specialty focusing on the study, diagnosis, and treatment of joint conditions Radiology the branch of medical science dealing with the medical use of X-rays or other penetrating radiation Toxicology the branch of pharmacology that deals with the nature and effects and treatments of poisons Urology the branch of medicine that deals with the diagnosis and treatment of disorders of the urinary tract or urogenital system Cytology the branch of biology that studies the structure and function of cells Histology the branch of biology that studies the microscopic structure of animal or plant tissues Physiology the branch of the biological sciences dealing with the functioning of organisms Epidemology the brach of medicine that studies the causes of diseases Obstetrics the branch of medicine dealing with childbirth and care of the mother