GENERAL HISTOLOGY

Detailed explanation-1: -The two major lymphatics of the body include the right lymphatic duct and the thoracic duct. The right duct drains most of the right upper quadrant whereas the thoracic duct drains the lower body including the extremities and abdomen.

Detailed explanation-2: -The right lymphatic duct drains lymph from the right upper limb, right side of thorax and right halves of head and neck. The thoracic duct drains lymph into the circulatory system at the left brachiocephalic vein between the left subclavian and left internal jugular veins.

Detailed explanation-3: -The thoracic duct is the largest lymphatic vessel in the human body. Around 75% of the lymph from the entire body (aside from the right upper limb, right breast, right lung and right side of the head and neck) passes through the thoracic duct. The cells of the immune system circulate through the lymphatic system.

Detailed explanation-4: -Each lymph node is divided into two general regions, the capsule and the cortex. The capsule is an outer layer of connective tissue. Underlying the capsule is the cortex, a region containing mostly inactivated B and T lymphocytes plus numerous accessory cells such as dendritic cells and macrophages.