Venule

Venule
Venule
	Types of blood vessels, including a venule, vein, and capillaries
Details
Identifiers
Latin	venula
MeSH	D014699
TA98	A12.0.00.037
TA2	3903
TH	H3.09.02.0.03002
FMA	63130
	Anatomical terminology

A venule is a very small vein in the microcirculation that allows blood to return from the capillary beds to drain into the venous system via increasingly larger veins. Post-capillary venules are the smallest of the veins with a diameter of between 10 and 30 micrometres (μm). When the post-capillary venules increase in diameter to 50μm they can incorporate smooth muscle and are known as muscular venules.^[1] Veins contain approximately 70% of total blood volume, while about 25% is contained in the venules.^[2] Many venules unite to form a vein.

^ Standring, Susan (2016). Gray's anatomy : the anatomical basis of clinical practice (Forty-first ed.). [Philadelphia]. p. 131. ISBN 9780702052309.{{cite book}}: CS1 maint: location missing publisher (link)
^ Woods, Susan (2010). Cardiac Nursing. New York: Lippincotts. p. 955. ISBN 9780781792806.

[GRAYS2016-1] Standring, Susan (2016). Gray's anatomy : the anatomical basis of clinical practice (Forty-first ed.). [Philadelphia]. p. 131. ISBN 9780702052309.{{cite book}}: CS1 maint: location missing publisher (link)

[2] Woods, Susan (2010). Cardiac Nursing. New York: Lippincotts. p. 955. ISBN 9780781792806.

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