Cardiovascular | Tunic Layers & Types of Capillaries

Brief Table of Contents: Arteries - 0:40 Tunica Intima / Tunica Interna - 1:40 – Internal Elastic Lamina -- Marfan Syndrome -- Ehlers-Danlos Syndrome - 3:00 – Tunica Media -- Sympathetic Innervation 4:20 – External Elastic Lamina 5:20 – Tunica Externa -- Dense Irregular Connective Tissue --Vasa Vasorum blood vessels nourish tunica externa --- Tertiary Syphilis 7:35 – Veins (mostly the same layers as arteries with some different features) - Elastic Lamina Differences if present - 8:35 – Thinner Tunica Media - 9:05 – Thick Tunica Externa - Collapsed Lumen 10:25 – Capillaries - 11:45 – Sinusoidal Capillary -- Most Permeable - 14:25 – Continuous Capillary - 17:55 – Fenestrated Capillary -- Medium intercellular clefts -- Fenestration Pores You may wish to add this to the description or create your own more detailed version. Thanks for these videos.

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Vein Structure: 7:36 (similar to Artery, but with differences in thickness of layers, due to less pressure ) Internal Elastic Lamina: very little or none: 8:00 Tunica Media: a lot thinner than in Artery: 8:38 Tunica Externa: much thicker than in artery (nearer the surface of body) : 9:05

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Capillaries: three types: 10:30 Sinusoidal: 10:49 (details: huge intercellular clefts : 11:49) Continuous: 11:01 (small clefts, & pericytes; no clefts & tight junctions in BBB : 14:27) Fenestrated: 11:21 (medium size clefts, pores between cells?) 17:58

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Artery Structure: Endothelial cells: 0:50 subEndothelial layer: 0:54 Internal Elastic Lamina: 1:43 Smooth Muscle Cells: Tunica Media: 3:00 External Elastic Lamina: 4:24 Tunica Externa: Dense Irregular Connective Tissue: 5:21 Vasa Vasorum: 6:02 Capillaries: 10:30

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