MICROANATOMY

Detailed explanation-1: -Lymphatic capillaries are similar to blood capillaries, but they are larger in diameter and have closed ends. Unlike blood capillaries, fluid can flow into lymph capillaries but can’t flow out through the cell walls. It can only move forward.

Detailed explanation-2: -The smallest lymphatic vessels are the lymph capillaries, which begin in the tissue spaces as blind-ended sacs. Lymph capillaries are found in all regions of the body except the bone marrow, central nervous system, and tissues, such as the epidermis, that lack blood vessels.

Detailed explanation-3: -Lymphatic capillaries are blind-ended tubes with thin endothelial walls (only a single cell in thickness). They are arranged in an overlapping pattern, so that pressure from the surrounding capillary forces at these cells allows fluid to enter the capillary (see the image below).

Detailed explanation-4: -Lymphatic capillaries are free and blind at one end, so that the capillary can join the interstitial fluid but can not pass out. Their contents are drained into lymph vessels through these capillaries; they travel through the lymph nodes and then join the venous or main circulatory system.

Detailed explanation-5: -Lymphatic capillaries start as blind-ended sacs in the periphery and merge to collecting lymphatic vessels, which are surrounded by pericytes and have valves to direct the flow into the draining lymph nodes (Figure 1).