By M.P. Wiedeman (Auth.)
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The arterial and venous vessels show spontaneous vasomotor changes, and precapil lary sphincters may close completely to curtail capillary blood flow when redis tribution of blood is necessary (Zweifach and Metz, 1955). 7 μ,ηι. The sartorius muscle of the cat follows the description in general, and obser2 3. 30 Micro vasculature of Specific Organs and Tissues vers report capillary flow, based on velocity measurements, varied between steady, periodic, and irregular (Burton and Johnson, 1972). Once again, the site of regulation of capillary flow was not identified.
Lee and Holze (1950), responding to the new and stimulating findings of Chambers and Zweifach (1944) in the microcirculation of the mesentery and 54 3. Microvasculature of Specific Organs and Tissues omentum of rats and dogs, studied the arrangement of terminal arterioles, capillaries, and venules in the human conjunctiva and found the pattern to be very similar to that of animals. Using a standard type slit-lamp microscope with a magnification of 62 x , they identified arterioles, collecting venules, true capillaries, precapillary sphincters (or regions) that were reactive, and main arteriovenular channels that formed a direct connection between arterial and venous vessels.
Special Tissues 57 0 1mm Fig. 3 . 3 1 . Pial circulation of the rabbit. The penetrating arterial vessels and the emerging venous vessels appear as circles on the surface of the brain. (Courtesy of Dr. S. ) VI. SPECIAL TISSUES A. Hamster Cheek Pouch Cheek pouches of the hamster are internal, bilateral sacks that lie beneath the skin and extend from a slit-like opening in the corner of the mouth down to the shoulder region, a distance of about 4 cm. The empty and relaxed pouch is approximately 3-5 cm long and 1 cm wide.
An Introduction to Microcirculation by M.P. Wiedeman (Auth.)