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Related Concept Videos

Veins of Head and Neck01:19

Veins of Head and Neck

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.
On the other hand, the vertebral veins, unlike their arterial counterparts, are not primarily responsible for brain drainage. Instead, they drain the cervical vertebrae, spinal cord, and some small...
Veins as Blood Reservoirs01:10

Veins as Blood Reservoirs

Veins, while chiefly responsible for circulating blood back to the heart, also function as storage vessels for blood. They house approximately 64 percent of the body's total blood volume, a feat made possible by their high capacitance—the inherent ability to expand and accommodate large volumes of blood, even under low pressure. The large diameter and thin walls of veins augment their distensibility, significantly more so than arteries, due to their classification as capacitance vessels. When...
Veins of Upper Limbs01:17

Veins of Upper Limbs

The human circulatory system, a marvel of biological engineering, is a complex network of vessels that transport blood throughout the body. Among these, the veins responsible for carrying blood from the upper limbs are divided into two categories: deep and superficial.
The deep venous system is primarily composed of the ulnar and radial veins. The ulnar vein, which drains the fingers through the superficial palmar venous arches, and the radial vein, which serves the palms via the deep palmar...
Overview of Systemic Veins01:11

Overview of Systemic Veins

Systemic veins are crucial blood vessels that return deoxygenated blood from various body tissues back to the heart. There are three systemic veins that return deoxygenated blood to the heart, they are as follows.
The coronary sinus, the heart's principal vein, resides in the coronary sulcus on the heart's posterior aspect. This broad venous channel receives nearly all venous blood from the myocardium, the heart muscle. It is fed by three primary veins: the great cardiac vein, the middle...
Veins01:17

Veins

Veins are an integral part of our circulatory system, serving as the blood vessels that transport blood from all body regions to the heart. They are a network of hollow tubes that carry blood low in oxygen from the body's cells back to the heart for reoxygenation. Veins are crucial for maintaining the body's overall fluid balance and the continuous circulation of blood.
Structure of Veins:
The structure of veins is specifically designed to assist in the low-pressure transportation of blood...
The Blood-brain Barrier00:49

The Blood-brain Barrier

Overview

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Related Experiment Video

Updated: May 29, 2026

Reliable Isolation of Central Nervous System Microvessels Across Five Vertebrate Groups
10:35

Reliable Isolation of Central Nervous System Microvessels Across Five Vertebrate Groups

Published on: January 12, 2020

The great brain versus vein debate.

Ravi S Menon1

  • 1Robarts Research Institute, The University of Western Ontario, 100 Perth Drive, London, On, Canada N6A 5K8. rmenon@imaging.robarts.ca

Neuroimage
|September 24, 2011
PubMed
Summary

Functional brain imaging using BOLD signals initially relied on large veins, limiting spatial resolution. Separating venous from microvascular signals enhances fMRI resolution for detailed brain structure imaging.

Area of Science:

  • Neuroimaging
  • Functional Magnetic Resonance Imaging (fMRI)

Background:

  • Early functional brain imaging using Blood-Oxygen-Level-Dependent (BOLD) signals at high magnetic fields recognized signal origins from both macrovasculature (visible veins) and microvasculature (smaller, non-visible vessels).
  • A predominant sensitivity to the macrovasculature was anticipated to limit the effective spatial resolution compared to techniques sensitive to the microvasculature.

Observation:

  • The spatial localization of the BOLD signal was initially understood to be coarse due to its origin in visible veins.
  • Smaller, non-visible vessels (microvasculature) were also identified as contributing to the BOLD signal.

Findings:

  • Eliminating the venous signal and enhancing the microvascular signal was shown to improve spatial resolution in fMRI.
  • This separation enabled the imaging of fine brain structures like columnar and lamellar formations.

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Paired Cisterna Magna Nanoinjection and Laser Speckle Contrast Imaging Assay to Study Cerebral Blood Flow Regulation In Vivo

Published on: July 8, 2025

Related Experiment Videos

Last Updated: May 29, 2026

Reliable Isolation of Central Nervous System Microvessels Across Five Vertebrate Groups
10:35

Reliable Isolation of Central Nervous System Microvessels Across Five Vertebrate Groups

Published on: January 12, 2020

Paired Cisterna Magna Nanoinjection and Laser Speckle Contrast Imaging Assay to Study Cerebral Blood Flow Regulation In Vivo
06:24

Paired Cisterna Magna Nanoinjection and Laser Speckle Contrast Imaging Assay to Study Cerebral Blood Flow Regulation In Vivo

Published on: July 8, 2025

Implications:

  • Improved microvascular sensitivity distinguishes advanced fMRI techniques from predecessors, offering higher resolution brain imaging.
  • Understanding and separating vascular contributions is crucial for interpreting fMRI data and advancing neuroscience research.