Introduction to Lymphatic System PDF

INTRODUCTION TO LYMPHATIC SYSTEM Prof Dr Mohamed El-Badry Mohamed Professor and Head of Human Anatomy and Embryology Department, Head of Academic Departments Faculty of Medicine, Merit University Professor of Human Anatomy and Embryology Department,...

INTRODUCTION TO LYMPHATIC SYSTEM Prof Dr Mohamed El-Badry Mohamed Professor and Head of Human Anatomy and Embryology Department, Head of Academic Departments Faculty of Medicine, Merit University Professor of Human Anatomy and Embryology Department, Faculty of Medicine, Assiut University  Objectives of the of the Lecture By the end of the lecture the student should be able to:. Define the lymphatic system and its function. Define the lymphoid tissue. Mention the sites that produce the lymphocytes. Define the lymphatic vessels and their types. What are the sites which have not lymphatic vessels?. Define the lymph. Define the lymph capillaries. Describe anatomy of the lymph nodes. Where is the end of the right lymphatic trunk?. Where is the end of the thoracic duct? LYMPHATIC SYSTEM Essentially a drainage system. There is no circulation. Essential for immunologic defences of the body against bacteria and viruses, absorption and transport of dietary fat. Lymphatic (Lymphoid) Tissues: - Type of connective tissue that contains large amounts of lymphocytes Sites that produce lymphocytes: 1. Thymus 2. Lymph nodes 3. Spleen 4. Lymphatic nodules 5. Aggregated in walls of digestive tract 6. Myeloid tissue in red bone marrow Lymphatic Vessels: Tubes that assist cardiovascular system in removal of tissue fluid from tissue spaces of the body then return the fluid to the blood. The lymphatic vessels are present in all tissues and organs of the body EXCEPT: 1. Central nervous system 2. Eyeball 3. Internal ear 4. Epidermis of the skin 5. Cartilage 6. Bone Lymph: - Tissue fluid once it enters a lymphatic vessel. Lymph Capillaries: Network of fine vessels that drain the lymph from the tissues They are in turn drained by small lymph vessels, which unite to form large lymph vessels. The lymph vessels have a beaded appearance because of the presence of numerous valves along their course. Lymph Nodes: Small masses of lymphatic tissue located along course of lymphatic vessels through it lymph is filtered on its way to venous system. Afferent Lymph Vessels: - Lymph vessels carry lymph to lymph node Efferent Lymph Vessels: Lymph vessels that transport lymph away from a lymph node Right Lymphatic Trunk: - Ends into junction of right venous angle Drains lymph from body’s right upper quadrant. Thoracic Duct: - Drains lymph from remainder of the body. Ends into left venous angle (angle between left internal jugular vein and left subclavian vein).