Venule

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

## Overview

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A venule is a small blood vessel that allows deoxygenated blood to return from the capillary beds to the larger blood vessels called veins.

## Structure

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Venule walls have three layers: An inner endothelium composed of squamous endothelial cells that act as a membrane, a middle layer of muscle and elastic tissue and an outer layer of fibrous connective tissue. The middle layer is poorly developed so that venules have thinner walls than arterioles. These vessels are pink sometimes due to the high content of nitrogen.

## External links

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Arteries and veins

Vessels|

| Arteries|

* Nutrient artery
* Arteriole
* Metarteriole
* Elastic artery

|

Capillaries|

* Types
* Continuous
* Fenestrated
* Sinusoidal
* Precapillary sphincter
* Precapillary resistance

Veins|

* Vena comitans
* Superficial vein
* Deep vein
* Emissary veins
* Venous plexus
* Venule

Lymph|

* Lymphatic vessel
* Lymph
* Lymph capillary

Circulatory system|

| Systemic|

Left heart → Aorta → Arteries → Arterioles → Capillaries → Venules → Veins → Vena cava → (Right heart)

|

Pulmonary|

Right heart → Pulmonary arteries → Lungs → Pulmonary vein → Left heart

Microanatomy|

* Microvessel
* Microcirculation
* Tunica intima
* Endothelium
* Internal elastic lamina
* Tunica media
* Tunica externa
* Vasa vasorum
* Vasa nervorum
* Vascular nerves
* Rete mirabile
* Circulatory anastomosis

bs:Venula de:Venole it:Venula nds:Venool

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