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Structure of Arteries and Veins (Layers (superficial to deep) (Middle…
Structure of Arteries and Veins
Layers (superficial to deep)
Middle
smooth muscle, collagen, elastic fibers
Deep
Intima: simple squamous epithelial
Supercial
Adventitia: collagen
Arteries
medium muscular
Adventura- thick, mostly collagen, some elastic
Media- thick smooth muscle
Intima- elastic fibers
Small Arterioles
media- few layers of smooth muscle
Intima- few elastic fibers
Adventura- thin; mostly collagen
Large Elastic: aorta and pulmonary trunk
Media- smooth muscle and elastic fibers
Intima- thick layer of elastic fibers
Adventura-thin collagen
Veins
Medium
media-thin
Intima-thin
Adventura- distinct
Small
Intima- thin
Media- thin
Large
Media- thin
Intima- few elastics fibers
Adventura- thick
Capillaries
Single layer of endothelial cells
continuous= no pores
Fenestrated= thin porous regions