What are the 3 layers of vessels?
What are the components of the tunica intima?
• Internal elastic lamina (IEL) in arteries
What are the components of the tunica media?
• Smooth muscle layer
• External elastic lamina (EEL) in arteries
What are the components of the tunica adventitia?
• Connective tissue and fibroblasts
• Longitudinal smooth muscle in veins
• Vasovasorum in large vessels
What is a unique structure found only in veins?
What vessel part is very large in large arteries?
What is the major cell type that dominates medium arteries?
Smooth muscle (AKA muscular artery)
What is the difference between small and medium arteries?
Generally have same structure as medium artery but have a smaller diameter and no external elastic lamina. The tunica media also has fewer layers of smooth muscle cells.
What is the difference between the arterioles and other blood vessels?
Only two layers of smooth muscle cells. Internal elastic lamina, external elastic lamina, and subendothelial layers usually absent.
Continuous, Fenestrated and Discontinuous Capillaries
Continuous - no holes at all
Fenestrated - holes on the endothelium
Discontinuous - holes on the endothelium AND basal lamina
What layer generally dominates in veins?
Tunica adventitia which is at least as wide as the media, and often even wider.
What layer are the valves in veins formed from?
Where are the vasa vasorum found?
What are the differences in the lumen of arteries and veins?
Arteries are smaller and rounder with prominent internal elastic lamina while veins are larger and flatter
What are some of the features of the lymphatic vessels?