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Related Concept Videos

Increased Intracranial Pressure l: Introduction01:14

Increased Intracranial Pressure l: Introduction

Intracranial hypertension is a sustained elevation of intracranial pressure (ICP) above 22 mm Hg. In supine adults, normal ICP is ~7–15 mm Hg.The rigid, nonexpandable cranium contains three components—brain tissue, blood, and cerebrospinal fluid (CSF)—that total ~1,700 mL in a typical adult: 1,400 mL brain (~80%), 150 mL blood (~10%), and 150 mL CSF (~10%). According to the Monro–Kellie doctrine, total intracranial volume is effectively fixed. When one component expands, CSF and venous blood...
Increased Intracranial Pressure ll: Pathophysiology01:29

Increased Intracranial Pressure ll: Pathophysiology

Increased intracranial pressure (ICP) refers to a potentially life-threatening rise in pressure inside the skull. This usually happens when there is a major change in the volume of brain tissue, blood, or cerebrospinal fluid (CSF) — the three components inside the skull. According to the Monro-Kellie doctrine, if the volume of one component increases, the volumes of the other components must decrease to maintain normal pressure. If this does not happen, ICP rises.The process often begins with...
Cerebral Edema l: Introduction01:19

Cerebral Edema l: Introduction

Cerebral edema is a pathological increase in brain water content that disrupts intracranial pressure regulation and impairs neurological function. Because the cranial vault is rigid, even modest increases in tissue volume can compromise cerebral perfusion, distort neural structures, and initiate secondary injury. Cerebral edema develops through four principal mechanisms: vasogenic, cytotoxic, interstitial, and ionic.Vasogenic EdemaVasogenic edema arises from disruption of the blood–brain...
Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...
Cerebrospinal Fluid01:21

Cerebrospinal Fluid

Cerebrospinal fluid (CSF) is a colorless liquid that flows around the brain and the spinal cord, playing a vital role in the protection, support, and overall function of the central nervous system (CNS). CSF production, circulation, and absorption are tightly regulated processes essential for the brain and spinal cord to function properly.
CSF Production
CSF is produced mainly in the choroid plexus, a network of capillaries and ependymal cells located within the ventricular system of the brain.

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Related Experiment Video

Updated: Jun 19, 2026

A Detailed Protocol for Physiological Parameters Acquisition and Analysis in Neurosurgical Critical Patients
05:01

A Detailed Protocol for Physiological Parameters Acquisition and Analysis in Neurosurgical Critical Patients

Published on: October 17, 2017

STUDIES ON INTRACRANIAL PRESSURE.

J A Eyster1, M T Burrows, C R Essick

  • 1Physiological Laboratory of the Johns Hopkins University.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Increased intracranial pressure in dogs causes blood vessel constriction in organs and limbs, confirming earlier research. This study also highlights the limitations of artificial brain perfusion methods in physiological investigations.

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Area of Science:

  • Physiology
  • Neuroscience
  • Vascular Biology

Background:

  • Cushing's earlier work established a link between intracranial pressure and blood pressure.
  • Understanding the cerebral circulation and its response to pressure changes is crucial for neurological research.

Purpose of the Study:

  • To confirm and expand upon Cushing's findings regarding intracranial pressure and blood pressure.
  • To investigate the mechanisms behind blood pressure changes in response to elevated intracranial pressure.
  • To evaluate the efficacy of artificial brain perfusion techniques in canine models.

Main Methods:

  • Experimental manipulation of intracranial pressure in dogs.
  • Observation of blood pressure responses and vascular changes in various organs.
  • Anatomical investigation of cerebral arterial connections, including the internal carotid and internal maxillary arteries.
  • Assessment of artificial perfusion methods for canine brains.

Main Results:

  • Elevated intracranial pressure above blood pressure induces intestinal, renal, and limb vasoconstriction, preceded by vasodilation.
  • The internal maxillary artery in dogs is identified as a significant cerebral artery, with a major anastomotic connection to the internal carotid.
  • Artificial brain perfusion in dogs is deemed unreliable due to alternative vascular pathways.
  • Intracranial pressure exceeding blood pressure causes complete cerebral anemia, while moderate increases affect the Circle of Willis and basal arteries.

Conclusions:

  • The study validates Cushing's findings on intracranial pressure effects.
  • Specific vascular responses, including cerebral anemia, are detailed under varying intracranial pressures.
  • The anatomical significance of the internal maxillary artery and limitations of artificial perfusion are established.