Blutgefäße/en: Unterschied zwischen den Versionen

Version vom 22. Mai 2019, 00:24 Uhr

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Tubular cavities for the transport of blood.

All blood vessels except the [capillary] have four layers.

The tunica interna (intima) is the innermost wall and consists of a continuous single row of endotheliumcells lying in the longitudinal direction of the vascular flow. It serves as a barrier to the tissue. The endothelium is separated from the wall by a basement membrane. It is a very smooth layer that ensures unimpeded blood flow. The second layer (Membrana elastica interna) is a thin layer of connective tissue (subendothelium). Here, Arteries has more elastic fibers. The tunica media (media) consists mainly of smooth muscles, in the veins thinner than in the large arteries, between which elastic material and collagenous fibrils lie. The collagen fibrils reduce the elasticity of the venous tube # The tunica externa (adventitia) has important functions in the supply and innervation of the blood and lymph vessel system. In addition, it forms a displacement bearing and a demarcation from neighbouring structures. Depending on the type of vessel, collagene and elastic fibres occur to varying degrees. It does not necessarily set itself off cleanly from its surroundings because its collagen fibres radiate into the surrounding tissue.

The walls of the larger arteries must also be nourished, therefore small arteries are built into the outer wall, which take over the nourishment and come from the closer environment. Veins and lymphatic vessels have valves from intimate pockets that protrude into the lumen as protuberances. They form valves and direct the blood stream or lymph flow to the center.

A possible backflow (e.g. through the muscle pump) unfolds the flaps and prevents this.

https://de.wikipedia.org/wiki/Blutgefäß _{(Wikipedia CC-by-sa-3.0)}

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 # The tunica interna (intima) is the innermost wall and consists of a continuous single row of [[Endothel/en|endothelium]]<nowiki>cells</nowiki> lying in the longitudinal direction of the vascular flow.  It serves as a barrier to the tissue. The [[Endothel/en|endothelium]] is separated from the wall by a basement membrane. It is a very smooth layer that ensures unimpeded blood flow. The second layer (Membrana elastica interna) is a thin layer of connective tissue (subendothelium). Here, [[Arterie/en|Arteries]] has more elastic fibers. The tunica media (media) consists mainly of smooth muscles, in the [[veins| veins]] thinner than in the large arteries, between which elastic material and collagenous [[Fibrillen/en|fibrils]] lie. The collagen fibrils reduce the elasticity of the venous tube # The tunica externa (adventitia) has important functions in the supply and innervation of the blood and lymph vessel system. In addition, it forms a displacement bearing and a demarcation from neighbouring structures. Depending on the type of vessel, [[collagen|collagene]] and elastic fibres occur to varying degrees. It does not necessarily set itself off cleanly from its surroundings because its collagen fibres radiate into the surrounding tissue.
-The walls of the larger arteries must also be nourished, therefore small arteries are built into the outer wall, which take over the nourishment and come from the closer environment. Veins and [[lymphatic system|lymphatic vessels]] have valves from intimate pockets that protrude into the lumen as protuberances. They form valves and direct the blood stream or lymph flow to the center.
+The walls of the larger arteries must also be nourished, therefore small arteries are built into the outer wall, which take over the nourishment and come from the closer environment. Veins and [[Lymphgefäßsystem/en|lymphatic vessels]] have valves from intimate pockets that protrude into the lumen as protuberances. They form valves and direct the blood stream or lymph flow to the center.
 A possible backflow (e.g. through the muscle pump) unfolds the flaps and prevents this.