Lymphatic system:

• Lymph is a clear, colorless liquid somewhat similar to blood plasma from which is derived.
• Lymph contain less red cells and numerous lymphocytes as well as inorganic salts, glucose, on protein nitrogenous substance, and some protein (about half than blood plasma).
• it serves as a system for draining tissue fluid that parallels and augments the venous system and there fore assists in the control of the intercellular fluid pressure.
• It also serves as antibodies and acts as defense mechanism against noxious materials by filtering them out of tissue fluid there by assisting the defense mechanism.
• There is one large node for each half of udder; supramammary lymph node, lies just posterior to inguinal canal Lymph nodes filter and remove foreign material and add lymphocytes to lymph in response to antigen stimulates antibody formation in the vascular system.