Histology of the CVS Flashcards Preview

ESA 2- Cardiovascular System > Histology of the CVS > Flashcards

Flashcards in Histology of the CVS Deck (134)
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121

What is the diameter of large veins?

Can be over 1cm

122

How do large veins differ from smaller ones?

The tunica intima is thicker

123

Do large veins have a prominent tunica media?

Most don’t

124

What is well developed in large veins?

Tunica adventitia

125

What large veins differ from most?

The superficial veins of the legs, which have a well-defined muscular wall

126

Why do the superficial veins of the legs have a well defined muscular wall?

Possibly to resist distension caused by gravity

127

How do valves in the vein act?

Together with muscle contraction, to propel blood towards the heart

128

What are venae comitantes?

Deep paired veins that, in certain anatomical positions, accompany one of the smaller arteries on each side of the artery. 
The three vessels are wrapped together in one sheath

129

What does the pulsing of the artery in vanae comitantes promote?

Venous return within the adjacent, parallel, paired veins

130

Give 3 examples of venae comitantes

Brachial, ulnar and tibial

131

Give 7 examples of large veins

Venae cavae 
Pulmonary 
Portal 
Renal 
Internal jugular 
Iliac
Azygous

132

What do large veins have in the tunica adventitia?

Well-developed, longitudinally orientated smooth muscle

133

What do large veins have in the tunica media?

Circularly arranged smooth muscle

134

Do large veins have vaso vasorum?

Yes