Stimulus/characteristic   Brain   Placenta   References
  Stimuli    
Hyperglycemia Vasodilation Vasodilation [66,154]
Adenosine Vasodilation Vasodilation [12,155]
Nitric oxide Vasodilation Vasodilation [12,156]
ATP Vasodilation Vasodilation [157,158]
Potassium Vasodilation Vasodilation [159,160]
Vasoactive intestinal peptide Vasodilation Vasodilation [161,162]
Prostaglandin I2 Vasodilation Vasodilation [163,164]
Bradykinin Vasodilation Vasoconstriction [165,166]
Ischemia/hypoxia Vasodilation Vasoconstriction [167,168]
Prostaglandin E2 Vasodilation Vasoconstriction [169,170]
Serotonin Vasoconstriction Vasoconstriction [166,171]
Neuropeptide Y Vasoconstriction Vasoconstriction [172,173]
  Characteristic    
Innervation Present Absent [6,174]
Fenestration Absent Absent [175,176]
vasa vasorum Absent Absent [177,178]
Tight junctions Present Present [175,176]
GLUT1 Present Present [179,180]
GLUT1: Glucose Transporter 1
Table 1: Characteristics of the vascular bed in the placenta and brain.