29 topics with concise summaries: definitions, key facts, and classroom questions.
Inflammation is a standard pathological process underlying the majority of diseases. In this section, we examine the morphological essence of the inflammatory response: how cellular and plasma mediators work, which vascular reactions are triggered first, and how leukocyte emigration into the lesion occurs.
The section covers all forms and outcomes of the process. We will sequentially examine the stages of acute inflammation and the types of exudative response (including abscess, phlegmon, empyema, and putrefactive inflammation). A separate module is dedicated to chronic and productive inflammation: from interstitial infiltrates to the formation of specific granulomas (syphilitic, scleromatous) and hyperplastic processes.
In practical classes and exams, instructors are most rigorous about the morphological differences between exudative and productive inflammation. Pay special attention to the cellular composition of the infiltrate, the pathogenesis of granulomatous and immune inflammation, and the clear differential diagnosis of purulent processes (how an abscess differs from a phlegmon). Understanding these basic mechanisms is the foundation for studying systemic pathological anatomy.
How are the names of inflammatory processes correctly formed?
In most cases, the suffix "-itis" is added to the Latin or Russian name of the organ (e.g., myocardium — myocarditis, liver — hepatitis). Historical exceptions include angina, pneumonia, and empyema.
What is the general biological meaning of inflammation and immunity?
Their common goal is to clear the body of pathogenic irritants, foreign factors, or altered native tissues, as well as to reject the damaging agent and subsequently restore (repair) them.
How does primary alteration differ from secondary alteration?
Primary alteration is the tissue damage itself caused by a pathogenic factor. Secondary alteration occurs later when hydrolytic lysosomal enzymes released by phagocytes begin to destroy the body's own tissues within the inflammation focus.
In what sequence are mediators involved in the inflammatory process?
Inflammation always begins with the release of cellular mediators, which trigger the primary vascular reaction. Only after this are plasma mediators activated, ensuring the escape of exudate into the tissues.
Why is inflammation called a systemic reaction if it begins locally?
Because when the lesion reaches critical dimensions, mediators and breakdown products enter the bloodstream. They activate the nervous, endocrine, and immune systems, causing systemic changes in the body.
Who arrives first at the site of inflammation?
Local (resident) tissue cells react first, while neutrophils are the first to migrate from the bloodstream, providing early defense and blocking the pathogen.
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