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Chapters-15 The Blood Vessels and Lymphatics

BOOK TITLE: Pathology Quick Review and MCQs

Author
1. Mohan Harsh
ISBN
9788184487787
DOI
10.5005/jp/books/11098_15
Edition
3/e
Publishing Year
2010
Pages
24
Author Affiliations
1. Government Medical College and Hospital, Chandigarh, India
Chapter keywords

Abstract

Depending upon the calibre and certain histologic features, arteries are divided into 3 types: large (elastic) arteries, medium-sized (muscular) arteries and the smallest arterioles. All the arteries of the body have 3 layers in their walls: the tunica intima, the tunica media and the tunica adventitia. Large, elastic arteries such as the aorta, innominate, common carotid, major pulmonary, and common iliac arteries have very high content of elastic tissue in the media and thick elastic laminae. Medium-sized, muscular arteries are the branches of elastic arteries. Arterioles are the smallest branches with internal diameter 20-100 m. Capillaries are about the size of an RBC (7-8 m) and have a layer of endothelium but no media. Arteriosclerosis is a general term used to include all conditions with thickening and hardening of the arterial walls. Senile arteriosclerosis is the thickening of media and intima of the arteries seen due to aging. Lymphatic capillaries, lymphatic vessels and lymph nodes comprise the lymphatic system. Acute lymphangitis occurs in the course of many bacterial infections. Chronic lymphangitis occurs due to persistent and recurrent acute lymphangitis or from chronic infections like tuberculosis, syphilis and actinomycosis.

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