Circulatory System Histology Class Mind Map PDF

Transport oxygenated blood away from the Arteries...

Transport oxygenated blood away from the Arteries heart Veins Return deoxygenated blood to the heart Tiny blood vessels where gas and nutrient **Circulatory System Overview** Capillaries exchange occurs. Found in muscle, nerve, and connective tissues Uninterrupted endothelial lining **Continuous Capillaries** (most frequent) Subendothelial layer Loose connective tissue Lymphatic System Many pinocytotic vesicles network involved in transporting lymph, an immune system fluid that helps maintain fluid Located in endocrine glands, intestines, kidneys balance and supports immune function Endothelial lining with pores and continuous basal lamina **Fenestrated Capillaries** **Types of Capillaries** pors: Supports intense molecular exchange simple squamous endothelium Present in bone marrow, liver, spleen **Tunica Intima** Discontinuous endothelial lining and basal Internal elastic lamina (present in some arteries) **Sinusoids** lamina Smooth muscle cells (collagen type 3) Suited for large molecular and cellular exchange three layers of blood vessel walls: **Tunica Media** Elastic connective tissue External elastic lamina (frequent in muscular arteries) Tunica intima with endothelium, basal lamina, subendothelial layer (may contain valves) Circulatory System loose CT rich in Type I collagen fibers Histology Class Mind **Tunica Adventitia** Tunica media with smooth muscle and Small nerves and vessels nourishing larger connective tissue **Large Veins** Map Contains nervi vasorum and vasa vasorum vessel walls Tunica intima with endothelium and basal lamina Thick tunica adventitia with a lot smooth muscle bundles in longitudinal arrangement Tunica media with concentric elastic membranes (can't distinguish) and smooth muscle **Elastic Arteries** (large arteries) (e.g., aorta) Tunica intima with endothelium and subendothelial layer (may contain valves) Tunica media with some smooth muscle and elastic/reticular fibers Poorly developed tunica adventitia **Medium Veins** **Types of Veins** Adventitia with collagen fibers and fibroblasts Tunica intima with clearly visible internal elastic lamina Tunica media with multiple layers of smooth muscle (and external elastic lamina Similar to capillaries (but bigger lumens) but **Muscular Arteries** with larger diameter **Types of Arteries** Tunica intima with endothelium and basal lamina Poorly developed tunica adventitia Thin tunica media with few smooth muscle cells **Venules** and connective tissue Thin subendothelial layer and internal elastic Thin tunica adventitia with some collagen and lamina fibroblasts Few smooth muscle layers (≤4) in the tunica media. no external lamina **Arterioles** Loose connective tissue in tunica adventitia Metarteriole: Arterioles with Leads to pre-capillary sphincters (thickened Regulate blood flow in the capillary networks discontinuous layers of smooth myocytes smooth muscle tissue)