An Introduction to Microcirculation by M.P. Wiedeman (Auth.)

By M.P. Wiedeman (Auth.)

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The empty and relaxed pouch is approximately 3-5 cm long and 1 cm wide. 25 cm in width (Fig. 32). The blind end or tip of the pouch is free of muscle, although the aperature is surrounded with a sphincter-like arrangement of muscle, and longitudinal muscle fibers extend into the pouch for almost two-thirds of its length. 5 mm thick. The thickness of the various layers are 42 μτη of stratified squamous epithelium, 42 μ,πι of dense connective tissue, 182 μτη of the muscle layer, and 149 μτη of loose areolar connective tissue.

These vessels form arterial arcades; the diameters of the vessels, now larger than the parent vessels, are 34-58 /xm. From the arterial arcades, branches 20-40 μτη in diameter arise and interconnect with each other to form a secondary arcade. These arcading vessels give off branches 14-19 μ,πι in diameter, which are called mucosal arteries. The mucosal arteries pass through the muscularis mucosa and divide into two or three branches to form the mucosal capillary plexus. Each of the three or four branches of the mucosal arteries give rise to three to six capillaries at the base of the mucosa.

Shunt vessels seen in the cat mesentery are characterized by a more rapid flow than interconnecting vessels and are wider than other capil­ laries in the bed. The cat mesentery is richly supplied with lymphatic vessels. Their structure and characteristic behavior differs only minimally from lymphatics in other mesenteric beds. The smallest lymphatics are thin-walled endothelial vessels that are much larger than the capillary vessels in the same tissue, having diameters between 25 and 50 μπι. The terminal lymphatic vessels are actually wider than the collecting venules, even though they are frequently referred to as lymphatic capillaries.

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