Blood vessels Muhammed Asif Lecturer YMC Arteries 28

Blood vessels Muhammed Asif Lecturer, YMC

Arteries 28 -Oct-17 Blood vessels - Histology 2

Layers of the blood vessels Tunica intima Tunica media Tunica adventitia 28 -Oct-17 Blood vessels - Histology 3

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Tunica intima Layers of the blood vessels 1. Endothelium 2. Basal lamina 3. Sub - endothelial Connective tissue 4. Internal elastic lamina Tunica media 1. Elastic fibers or 2. Smooth muscle 3. External elastic lamina Tunica adventitia 1. Connective tissue 2. Vasa vasorum 3. Vasa nervi 28 -Oct-17 Blood vessels - Histology 5

Classification of blood vessels – Arteries – Arterioles – Capillaries – Sinusoides – Venules 28 -Oct-17 – veins Blood vessels - Histology 6

Blood vessels – Large sized artery/Elastic artery – Medium sized artery/Muscular artery – Large sized vein 28 -Oct-17 Blood vessels - Histology 7

ELASTIC ARTERY or LARGE SIZED ARTERY 28 -Oct-17 Blood vessels - Histology 8

Brachiocephalic trunk Left common carotid artery Left subclavian artery Aortic arch Ascending aorta Thoracic (descending) aorta Abdominal aorta Common iliac arteries 28 -Oct-17 Blood vessels - Histology 9

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Muscular artery and Medium sized artery 28 -Oct-17 Blood vessels - Histology 12

Muscular arteries Brachial artery Radial artery Ulnar artery 28 -Oct-17 Blood vessels - Histology 13

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Muscular artery 28 -Oct-17 Blood vessels - Histology 16

Elastic artery 28 -Oct-17 Blood vessels - Histology 17

Elastic artery Muscular artery Diameter of lumen > 1 cm Thickness of wall is more Tunica media – predominantly made up of elastic fibers made up of smooth muscle fibers Internal elastic lamina is ill defined Internal elastic lamina is clearly visible Tunica adventitia - thin Tunica adventitia - thick 28 -Oct-17 Blood vessels - Histology 18

Arteriosclerosis: 28 -Oct-17 Blood vessels - Histology 19

Aneurys m 28 -Oct-17 Blood vessels - Histology 20

Strok e 28 -Oct-17 Blood vessels - Histology 21

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Vein 28 -Oct-17 Blood vessels - Histology 24

Large vein SVC IVC 28 -Oct-17 Blood vessels - Histology 25

Medium sized vein 28 -Oct-17 Blood vessels - Histology 26

LARGE VEIN

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Varicose Veins 28 -Oct-17 Blood vessels - Histology 31

Notes 28 -Oct-17 Blood vessels - Histology 32

Elastic artery • TUNICA INTIMA consists of the – endothelial lining – basal lamina and – a small amount of sub endothelial connective tissue. Blood vessels - Histology – Inner elastic lamina which merges with media. 33 28 -Oct-17

• TUNICA MEDIA – Is thick and most prominent. – Contains mainly elastic fibres. – Few smooth muscle cells. 28 -Oct-17 Blood vessels - Histology 34

• TUNICA ADVENTITIA – Made of connective tissue with collagen fibres. – Vasa - vasora seen. 28 -Oct-17 Blood vessels - Histology 35

Muscular artery • TUNICA INTIMA consists of the – endothelial lining – basal lamina and – a small amount of sub endothelial connective tissue. Blood lamina vessels - Histology – Wavy inner elastic which is very 28 -Oct-17 36

• TUNICA MEDIA – Is thick with mainly smooth muscle cells. – Hence the name muscular artery. 28 -Oct-17 Blood vessels - Histology 37

• TUNICA ADVENTITIA: – Made of connective tissue with collagen fibres. 28 -Oct-17 Blood vessels - Histology 38

Large Vein • TUNICA INTIMA consists of the – endothelial lining – basal lamina and – a small amount of sub endothelial connective tissue. 28 -Oct-17 Blood vessels - Histology 39

• TUNICA MEDIA – is thin. – Contains smooth muscle cells – Collagen fibres. – It is thinner than adventitia. 28 -Oct-17 Blood vessels - Histology 40

• Large tunica adventitia. – The adventitia is the thickest layer in large veins. – made of prominent bundles of longitudinally arranged smooth muscle – some collagen fibres 28 -Oct-17 – some elastic fibres. Blood vessels - Histology 41

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