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Related Concept Videos

Veins of Head and Neck01:19

Veins of Head and Neck

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The blood drainage from the head and neck is primarily managed by three pairs of veins: the external jugular, internal jugular, and vertebral veins. The external jugular veins drain superficial scalp and face structures, passing over the sternocleidomastoid muscles to empty into the subclavian veins.
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The circulatory system plays a crucial role in ensuring the optimal functioning of the human body. One of its critical components is venous return - the process that completes the blood circulation cycle. This article will delve into the concept of venous return, how it works, and its significance to our health.
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Pressure Relationships in Thoracic Cavity01:24

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Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity.
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs...
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Assessment of the Cardiovascular System III: Palpation01:27

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Palpation involves feeling the body to evaluate texture, size, consistency, and tenderness for assessing cardiovascular health. The following steps are organized in a head-to-toe order:
Jugular Venous Pressure (JVP) Measurement
Position the patient at a thirty- to forty-five-degree angle or in a semi-fowler's position. Look for the highest point of pulsation in the internal jugular vein and measure the vertical distance to the angle of Loius or sternal angle. A normal JVP is 3-4 cm above...
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Pressure Variation in a Fluid at Rest01:11

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In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
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Hydrostatic Pressure Force on a Plane Surface01:04

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When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...
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Related Experiment Video

Updated: Mar 9, 2026

Measurement of the Hepatic Venous Pressure Gradient and Transjugular Liver Biopsy
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Measurement of the Hepatic Venous Pressure Gradient and Transjugular Liver Biopsy

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Internal jugular pressure increases during parabolic flight.

David S Martin1, Stuart M C Lee2, Timothy P Matz3

  • 1KBRwyle Science, Technology & Engineering Group, Houston, Texas david.s.martin@nasa.gov.

Physiological Reports
|January 1, 2017
PubMed
Summary
This summary is machine-generated.

Astronauts may experience vision changes due to elevated intracranial pressure (ICP). This study found internal jugular venous pressure (IJVP), an indicator of venous congestion, significantly increases in reduced gravity environments.

Keywords:
Spaceflightvisual impairment and intracranial pressure

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Area of Science:

  • Space Medicine
  • Physiology
  • Fluid Dynamics

Background:

  • Astronauts frequently report vision changes during spaceflight.
  • Elevated intracranial pressure (ICP) is a hypothesized cause, potentially linked to microgravity-induced fluid shifts.
  • Understanding venous pressure changes is crucial for assessing ICP in space.

Purpose of the Study:

  • To measure internal jugular venous pressure (IJVP) in varying gravity conditions.
  • To assess IJVP as an index of venous congestion during simulated microgravity and hypogravity.
  • To investigate the impact of intrathoracic pressure on IJVP in reduced gravity.

Main Methods:

  • Noninvasive compression sonography used to measure IJVP.
  • Measurements taken at rest during end-expiration in 11 healthy subjects.
  • Experiments conducted during normal gravity (1G) and weightlessness (0G) via parabolic flight, with additional tests in lunar and Martian gravity simulations and during Valsalva maneuvers.

Main Results:

  • IJVP was significantly higher in 0G (23.9 ± 5.6 mmHg) compared to 1G (9.9 ± 5.1 mmHg) (P < 0.001).
  • IJVP increased as gravity levels decreased in subjects exposed to lunar and Martian gravity simulations.
  • Elevated intrathoracic pressure, via Valsalva maneuvers, further increased IJVP in both 0G and 1G conditions.

Conclusions:

  • Acute exposure to reduced gravity elevates IJVP, suggesting increased venous congestion.
  • Conditions that increase intrathoracic pressure can further augment IJVP in reduced gravity.
  • Further research is needed to determine if elevated IJVP contributes to spaceflight-associated vision changes.