What type of blood capillaries hellps Organs such as the brain and thymus to have a more effective blood barrier?

Continuous type with few vesicles -the capillary endothelia in the brain and thymus are continuous, as is the basal lamina. the blood-thymus barrier provides the appropriate microenvironment for education of t cells without exposure to self. the capillary is further surrounded by perivascular connective tissue and epithelial cells and their basement membrane. in the blood-brain barrier, there is also a continuous endothelium with a basal lamina and an absence of fenestrations. surrounding the basal lamina in the brain are the foot processes of astrocytes, which form the glia limitans; however, it is important to note that the blood-brain barrier is formed specifically by endothelial cell occluding junctions with many sealing strands. other capillary endothelia in the body are fenestrated or discontinuous (sinusoids). the fenestrae are transcellular openings that occur in many of the visceral capillaries. in hematopoietic organs, there are large gaps in the endothelium, and the capillaries are classified as discontinuous. diaphragms (thinner cell membrane) are present in some fenestrated capillaries and produce an intermediate level of molecular transit.