: What is the field of medicine divided into? E.g. Anatomy and physiology What are all of the 'sub-categories' what make up the field of medicine? E.g. physiology and anatomy. I'm looking into lectures to learn so please list

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The list of sub-categories in medicine is pretty much the same as the list of specialists in medicine. This list is fairly complete, although there are one or two specialties that aren't listed such as sports medicine, and some fields such as radiology have more than one type of specialist. But for your purposes, this should be accurate enough.
www.jmu.edu/esol/specialist_list.htm

Allergist or Immunologist - conducts the diagnosis and treatment of
allergic conditions.

Anesthesiologist - treats chronic pain syndromes; administers
anesthesia and monitors the patient during surgery.

Cardiologist - treats heart disease

Dermatologist -treats skin diseases, including some skin cancers

Gastroenterologist - treats stomach disorders

Hematologist/Oncologist - treats diseases of the blood and
blood-forming tissues (oncology including cancer and other tumors)

Internal Medicine Physician - treats diseases and disorders of
internal structures of the body.

Nephrologist - treats kidney diseases.

Neurologist - treats diseases and disorders of the nervous system.

Neurosurgeon - conducts surgery of the nervous system.

Obstetrician - treats women during pregnancy and childbirth

Gynecologist - treats diseases of the female reproductive system and
genital tract.

Nurse-Midwifery - manages a woman's health care, especially during
pregnancy, delivery, and the postpartum period.

Occupational Medicine Physician - diagnoses and treats work-related
disease or injury.

Ophthalmologist - treats eye defects, injuries, and diseases.

Oral and Maxillofacial Surgeon - surgically treats diseases, injuries,
and defects of the hard and soft tissues of the face, mouth, and jaws.

Orthopaedic Surgeon - preserves and restores the function of the
musculoskeletal system.

Otolaryngologist (Head and Neck Surgeon) - treats diseases of the ear,
nose, and throat,and some diseases of the head and neck, including
facial plastic surgery.

Pathologist - diagnoses and treats the study of the changes in body
tissues and organs which cause or are caused by disease

Pediatrician - treats infants, toddlers, children and teenagers.

Plastic Surgeon - restores, reconstructs, corrects or improves in the
shape and appearance of damaged body structures, especially the face.

Podiatrist - provides medical and surgical treatment of the foot.

Psychiatrist - treats patients with mental and emotional disorders.

Pulmonary Medicine Physician - diagnoses and treats lung disorders.

Radiation Onconlogist - diagnoses and treats disorders with the use of
diagnostic imaging, including X-rays, sound waves, radioactive
substances, and magnetic fields.

Diagnostic Radiologist - diagnoses and medically treats diseases and
disorders of internal structures of the body.

Rheumatologist - treats rheumatic diseases, or conditions
characterized by inflammation, soreness and stiffness of muscles, and
pain in joints and associated structures

Urologist - diagnoses and treats the male and female urinary tract and
the male reproductive system

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From my current personal experience at medical school, I would like to add following precisions to Carey Gregory's answer:

Before going into clinical practice and rotating in the different subspecialties listed by Carey Gregory in his answer, in general, medical students learn the “fundamentals” of medicine during the first years of medical school.
This contains:

Human physiology (= the study of how living organisms works): this is
divided into several “sections” (or modules): cardiovascular
physiology, respiratory physiology, uro-genital physiology
(regulation of body fluid volume and composition), immunology,
neuroscience, muskulo-skelettal system, sensory physiology, digestive
physiology, endocrine physiology, digestive physiology, etc, reproductive physiology. One of our reference book is the “Human Physiology- The mechanisms of
body function” by Vander et al but there are other books available on
the topic.
Pathophysiology: this studies the impaired physiological mechanisms
that lead to diseases. There are many books on pathophysiology. Our
reference book is “Robbins Basic Pathology” by Kumar et al.
Anatomy/Neuroanatomy: There are many online available atlas which can
be very useful. Otherwise we use the “Clinically Oriented Anatomy” by
Moore. It contains some text which gives you the importance of your
studied anatomy structure in clinically practice (which makes
studying more interesting in my opinion)
Histology: this studies the organisation of cells and tissues using a
microscope.
Histopathology: studies the impaired organisation of cells and
tissues in diseases (with a microscope). Again, there are plenty of books, one commonly used is the “Histology- A text and atlas” by Ross et al
Pathology: macroscopic study of organs from patients with specific
conditions. You can find some online atlas of pathology. Otherwise the
Robbins (see under pathophysiology) is useful too.

I want to emphasise that those books are personal recommendations and that there are other books available on the market which are probably as good as my recommendations (or even better). Also you may wish to consider “Lecture Notes” on the topics, which are basically giving you a summary (when you want to have a quick overview)

Hope this brings some clarifications!