Lymphatic Organs and Tissues

lymphatic organs (defining feature and types)

lymphatic organs: surrounded by a capsule

• thymus

• lymph nodes

• spleen

lymphatic tissues (defining feature and types)

lymphatic tissues: not surrounded by a capsule; aka lymphatic nodules

• MALT

• Peyer’s Patches

• Appendix

• Tonsils

primary lymphatic (definition and types)

primary: areas that contain stem cells that mature into lymphocytes

• thymus, T-lymphocytes

• red bone marrow, B-lymphocytes

secondary lymphatic (definition and types)

secondary: sites for defense against invading pathogens

• lymph nodes

• spleen

• lymphatic nodules/tissues

thymus

• primary; organ

• butterfly shaped, behind sternum

• secretes thymosin hormone which stimulates stem cells to mature into T-lymphocytes

spleen

• secondary; organ

• left upper quadrant of abdominal cavity; contains lymphocytes and macrophages

• filters blood

lymph nodes

• secondary; organ

• form groups or chains throughout the body; contain lymphocytes and macrophages

• filter lymph from lymphatic vessels

tonsils

• secondary; tissue/nodules

• aggregations of lymphatic nodules

  • pharyngeal

  • palatine

  • lingual

1

pharyngeal tonsil

2

palatine tonsil

3

lingual tonsil

mucosa associated lymphoid tissue (MALT)

• secondary; tissue/nodules

• single lymphatic nodules throughout mucus membranes of the GI, respiratory, urinary, and reproductive tracts

peyer’s patches

• secondary; tissue/nodules

• aggregations of lymphatic nodules in the small intestines

appendix

• secondary; tissue/nodules

• worm-like structure attached to the beginning of the large intestine

4

submandibular lymph node

5

cervical lymph node

6

thymus

7

intestinal lymph node

8

appendix

9

red bone marrow

10

axillary lymph node

11

mammary lymph node

12

thoracic lymph node

13

spleen

14

peyer’s patches

15

iliac lymph node

16

inguinal lymph node

trace the flow of lymph from the thigh to the heart

1. blood capillaries in thigh

2. interstitial fluid

3. lymphatic capillaries

4. lymphatic vessels

5. inguinal lymph nodes

6. lymphatic vessels

7. iliac lymph nodes

8. lumbar trunk

9. cisterna chyli

10. thoracic duct

11. jugular/subclavian vein junction

12. brachiocephalic vein

13. superior vena cava

14. heart