a-short-review-of-histology

Lymphoid Capillary:

Lymphatic capillaries, like blood capillaries have only a simple squamous epithelium forming the wall
Unlike blood capillaries they do not have a basal lamina
Attached to the outside of the lymph capillary are collagen anchoring fibrils which attach the capillary to surrounding structures
These are important to maintain the patency of the capillary lumen when there is an oedematous swelling
In their absence, the pressure of the oedemic fluid in the tissue space would compress the capillary, occluding the lumen and cutting off the means of escape of that fluid
Lymphatic capillaries are often found as an anastomosing network around an artery
The pulsations of the artery will compress the thin walled lymphatic capillaries causing the lymphatic fluid within them to be pushed along
The valves within the capillaries will direct the flow of the lymph
Related to this association between arteries and lymphatic capillaries, there is often a close association between the arterial supply to a region of the body and the location of the draining lymph nodes draining lymph from that region: they are located at the root of the artery