The Monro-Kellie doctrine in its own context

Area of Science:

• Neuroscience
• Cerebrovascular Physiology
• History of Medicine

Background:

• The Monro-Kellie doctrine, proposed in 1783, posits that the total intracranial volume remains constant due to the brain's incompressibility and enclosure within the skull.
• This doctrine, experimentally supported by George Kellie, has faced historical resistance and critiques regarding its initial formulation.

Purpose of the Study:

• To investigate the historical physiological, pathophysiological, and therapeutic ideas that may have influenced Alexander Monro secundus's hypothesis.
• To clarify why Monro, despite detailed knowledge of the ventricular system, did not incorporate it as a compensatory compartment for intracranial blood volume fluctuations.

Main Methods:

• Historical analysis of scientific literature and prevailing medical theories from the late 18th century.
• Review of Monro's anatomical and physiological understanding, particularly concerning the ventricular system.

Main Results:

• Identified a gap in understanding the intellectual and scientific milieu influencing Monro's original hypothesis.
• Highlighted the overlooked potential of the ventricular cerebrospinal fluid (CSF) system as a compensatory volume regulator within the Monro-Kellie doctrine framework.

Conclusions:

• The historical context surrounding the Monro-Kellie doctrine requires further exploration to fully understand its origins.
• Re-evaluating the role of the ventricular system offers new perspectives on intracranial pressure regulation and the historical development of the Monro-Kellie doctrine.