Regions of the human body

Systematic and Topographic Approaches

Medical science uses two main approaches to study the human body. Systematic anatomy examines the organism in isolation by individual systems: skeletal, muscular, digestive, and so on.

In contrast, topographic (surgical) anatomy focuses on specific regions of the body. It investigates how organs, vessels, and nerves are positioned relative to each other and the skeleton within a single zone. This applied section serves the direct needs of clinical medicine and, above all, surgery.

Subject and Key Objectives of the Discipline

Studying body regions requires a comprehensive approach. Topographic anatomy pursues the following objectives:

• Analysis of the layered structure of each region (stratigraphia).
• Determination of the exact projections of internal organs, nerve trunks, and blood vessels onto the body surface (holotopia, skeletotopia).
• Investigating the spatial relationships of organs to one another (syntopia).
• Assessment of individual variability: how the shape and position of structures depend on the patient's sex, age, and body type.
• Theoretical justification of surgical approaches taking into account all anatomical nuances.

Connection with Operative Surgery

Topographic anatomy and operative surgery (the study of surgical operations) form a single educational and scientific discipline. Based on modern anatomical and physiological knowledge, surgery develops two crucial components of any operation:

1. Surgical approaches — the most rational pathways to the target organ.
2. Surgical techniques — specific measures aimed at exposing structures and exerting a therapeutic effect on them.

N.I. Pirogov's Revolution

The founder of topographic anatomy as a science is the brilliant Russian surgeon and anatomist N.I. Pirogov (1810–1881). His works completely revolutionized the concepts of methods for studying the human body and brought him worldwide fame.

The main breakthrough was the method of sawing frozen corpses in three directions (transverse, sagittal, and frontal). Before Pirogov, no approach was truly scientific because it did not allow preserving organs in their absolute natural, undisturbed position.

Pirogov also introduced the anatomical and physiological approach. He proved that topography must be studied in dynamics, linking morphological statics with function. To achieve this, he was the first to apply corpse experimentation on a large scale: changing the position of limbs in joints before sawing, filling the stomach or urinary bladder with water and the intestines with air, and injecting fluids into the pleural and peritoneal cavities to simulate pleuritis or ascites. This made it possible to understand how the mutual arrangement of organs changes under various conditions.

Practical Heritage and Outstanding Works

Three fundamental works published between 1837 and 1859 brought worldwide fame to the scientist. In them, he laid the foundations of the discipline:

• Formulated the laws of interrelationships between blood vessels and fasciae that are crucial for practice, describing them exactly as they appear to the surgeon during an operation.
• Developed new methods for exposing the common and external iliac arteries, proving their advantage through a series of sections.
• Proposed the extraperitoneal iliolumbar-inguinal incision (sectio lumboilioinguinalis), which gave impetus to the development of approaches to retroperitoneal organs (later, the work of German surgeon Bardenheuer in 1887 played a significant role in this).
• Created osteoplastic amputation of the leg, which opened a new era in the doctrine of amputations and became the basis for the development of osteoplastic limb operations.

Class and exam questions

What else to study on this topic

• Laws of interrelationships between blood vessels and fasciae according to N.I. Pirogov
• Technique and justification of the extraperitoneal iliolumbar-inguinal incision (sectio lumboilioinguinalis)
• Osteoplastic leg amputation: historical significance and principles
• Individual variability in the shape and position of organs depending on body type
• Projections of organs, vessels, and nerves onto the body surface (holotopia and skeletotopia)

Other topics in the "Additional Topics" section

Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.