Venous Anatomy Flashcards
(72 cards)
venous systems begins at the ___ level
capillary
the media layer in a vein is ___ compared to artery
very thin
the thickest layer in a vein is the ___ and the major component is ___
thickest layer - adventitia
major component - collagen
___ veins return deoxygenated blood to the right atrium of the heart
peripheral veins
veins carry away waste products of ___
cellular activity
veins are not ___ structures, have ____ (veno-motor tone)
not passive structures
have reactivity
contraction of smooth muscle cells can occur in response to ___
sympathetic nervous system (temp, stress, exercise)
___ are extensions of the intimal layer of veins
venous valves
bicuspid valves are thin, ___ cusps
leaflet like
what is a valve sinus?
slight dilatation of vessel diameter where valves are
valves in the ___ extremities are susceptible to disease
lower extremities
what is the function of venous valves?
open and close to allow unidirectional blood flow
5 veins without valves
- SVC
- IVC
- innominate vein
- soleal veins/sinuses
- intracranial sinuses
valves proximal to the ___ ligament vary
inguinal
external iliac vein has valves ~___% of the time
~25%
infrainguinal deep veins have variable # of valves
the # of valves increases ___
distally, especially infrapopliteal
GSV has about ___ valves
10-20
SSV has ___ valves
6-12
7 veins with valves
- external iliac vein
- infrainguinal deep veins (variable)
- GSV
- SSV
- perforating veins
- IJV
- upper extremities (variable)
veins are divided into what 3 systems
superficial
perforating
deep
the superficial system of veins drain the ___
skin and subcutaneous tissues
superficial system of veins empty into the ___ or ____
superficial truncal veins or directly into the deep system
superficial truncal veins lie in the ___ compartment
saphenous
perforating veins perforate the ___ and connect the ___
perforate the fascia
connect the deep and superficial system