GENERAL HISTOLOGY

Detailed explanation-1: -Sinusoids are slightly larger than capillaries and are found in the adrenal glands, liver, spleen, and bone marrow. Sinusoids have large gaps between endothelial cells; the basal lamina is either discontinuous or absent.

Detailed explanation-2: -Fenestrated capillaries have diaphragms that cover the pores whereas sinusoids lack a diaphragm and just have an open pore. These types of blood vessels allow red and white blood cells (7.5 m – 25 m diameter) and various serum proteins to pass, aided by a discontinuous basal lamina.

Detailed explanation-3: -Sinusoidal capillaries, sometimes referred to as sinusoids, or discontinuous capillaries, have endothelial linings with multiple fenestrations (openings), that are around 30 to 40 nm in diameter. These have no diaphragm and either a discontinuous or non-existent basal lamina.

Detailed explanation-4: -Continuous capillaries are the least permeable type of capillary, allowing only small solutes to pass across the capillary wall. These are found in areas such as the brain, lungs, and muscles. Fenestrated capillaries contain pores or fenestrations and are more permeable than continuous capillaries.