| Lab 7 Cardiovascular System: 1) Index 2) Introduction 3) Things to identify 4) Muscular Arteries ... 5) Arterioles 6) Elastic Arteries 7) Capillaries 8) Medium Sized Veins 9) Large Veins 10)Venules .. 11) Lymphatic Vessel 12) Heart 13) Practical |
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Lymphatics
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# 90 - Lymph vessel with valve, h-e # 211 - Lymphatic vessel with valve, whole mount # 150 - Trachea, human, h-e, 1.5 mm |
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Lymphatic vessels closely resemble the venules, but may be distinguished by: a . large lumen and very thin walls b. walls of irregular thickness c. absence of erythrocytes Look for these features in the lymphatic vessel in # 90. Locate lymphatic vessels in the loose connective tissue underlying the epithelium of the trachea (slide 150). Because of anchoring fibrils, lymphatic vessels appear "tacked" to their surrounding connective tissue and have irregular outlines. You may see leukocytes (e.g., lymphocytes) present in their lumen but not erythrocytes. Reference: Gartner, p. 161, Fig. 4 Wheater, p. 152, Fig. 8.22 - 8.23 DiFiore, p. 89, Fig. 1 |
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This is a slide showing a lymphatic vessel (blue arrow). The orange arrows are pointing to the epithelial cells lining the vessel. How can we come to the conclusion that this is a lymphatic vessel? First it looks very flimsy like a vein. It also has cells lining it. You almost want to call it a vein, but the thing that makes it clearly a lymphatic vessel is the ABSENCE OF RED BLOOD CELLS. That is the main clue to let you know that it is a lymph vessel instead of a vein. Blue arrow - Lymphatic vessel Red arrow - Nuclei of Epithelial cells |
Lymphatic Vessel |
