Flashcards in Histology of the CVS Deck (134)
What is the diameter of large veins?
Can be over 1cm
How do large veins differ from smaller ones?
The tunica intima is thicker
Do large veins have a prominent tunica media?
What is well developed in large veins?
What large veins differ from most?
The superficial veins of the legs, which have a well-defined muscular wall
Why do the superficial veins of the legs have a well defined muscular wall?
Possibly to resist distension caused by gravity
How do valves in the vein act?
Together with muscle contraction, to propel blood towards the heart
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
What does the pulsing of the artery in vanae comitantes promote?
Venous return within the adjacent, parallel, paired veins
Give 3 examples of venae comitantes
Brachial, ulnar and tibial
Give 7 examples of large veins
What do large veins have in the tunica adventitia?
Well-developed, longitudinally orientated smooth muscle
What do large veins have in the tunica media?
Circularly arranged smooth muscle