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"Thoroughfare Channels" in the Brain

Tsuneo Hasegawa, MD; J. R. Ravens, MD; J. F. Toole, MD

Arch Neurol. 1967;16(2):217-224.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

PRECAPILLARY arteriovenous anastomoses are a normal part of the microcirculatory bed of skin, muscle, lung, heart, intestine, liver, spleen, kidney, ear, and eye.^1,2 These have been labeled "preferential channels"³ or "throughfare channels" by Chambers and Zweifach.⁴ Whether similar anastomoses occur in the brain parenchyma has been a subject of debate. Rowbotham and Little^5-9 observed precapillary arteriovenous anastomoses in the pial circulatory system but not in the brain parenchyma of man, while Pfeifer^10,11 and Solnitsky¹² saw them in both.

Benda and Brownell¹³ and Swank and Hain¹⁴ injected particles up to 60µ in diameter into the carotid arteries of dogs and observed that they passed to the cerebral veins. Because the average capillary diameter has been found to be 5.8µ by Ueda,¹⁵ the passage of large emboli from artery to vein means that there is a shunt bypassing the capillaries or that . . . [Full Text PDF of this Article]

Author Affiliations
Winston-Salem, NC

From the departments of pathology, section neuropathology, and neurology, the Bowman Gray School of Medicine, Winston-Salem, NC.

Footnotes
Submitted for publication Aug 27, 1966; accepted Oct 3.

Reprint requests to Department of Neurology, Bowman Gray School of Medicine, Winston-Salem, NC 27103 (Dr. Toole).

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