venous drainage of the head

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communicating channels between blood vessels

anastomosis
large collection of blood vessels

plexus
blood filled spaces between two layers of tissue

venous sinus
what is the venous flow?

working from the tissue to the heart
what is bacteremia and what can it spread in?
- bacteria in the blood.
- spreads in anastamosis
plaques of cholesterol build up on the walls of the arteries and narrow or block it

atherosclerosis
what is a thrombus?

plaque that stays in the blood vessel
what is the sinus?

fluid filled space inbetween
what is an embolus? "e = escaping"

plaque getting off the wall
an embolus can cause a _______ ________ or _______.
- heart attack
- stroke
what is a hemmorhage?
- large amounts of blood escaping from the vessel, bleeding.
- i.e. hem on scaling
small amount of blood escaping into the surrounding tissue; bruising

hematoma
what hapens when the pterygoid plexus is hit during injection?

hematoma
it cushions the maxillary artery during mastication. it can drain or fill to reduce pressure

pterygoid plexus
where does the middle meningeal vein go to?

the brain
what is the supratrochlear vein a part of?

the eye muscle