Lymphoid organs in the human bodyमानव शरीर के लसीकाभ अंग

NCERT Fig 7.5 · Class 12 Biology · Chapter 7 · interactive diagram

Parts and their functions

• Bone marrow (अस्थि मज्जा) — Primary lymphoid organ: the main organ where all blood cells, including lymphocytes, are produced.
• Thymus (थाइमस) — Primary lymphoid organ: a lobed organ near the heart, beneath the breastbone. Large at birth, very small by puberty. With bone marrow, it provides the micro-environment for T-lymphocytes to develop and mature.
• Spleen (प्लीहा) — Secondary lymphoid organ: large, bean-shaped; mainly lymphocytes and phagocytes. Filters blood by trapping blood-borne microbes; has a large reservoir of erythrocytes.
• Lymph nodes (लसीका पर्व (लिम्फ नोड)) — Secondary lymphoid organs: small solid structures along the lymphatic system. They trap microbes/antigens in lymph and tissue fluid, which activates lymphocytes there.
• Tonsils (टॉन्सिल) — Secondary lymphoid organ in the throat, where lymphocytes meet antigens.
• Peyer's patches (पेयर पैच) — Secondary lymphoid tissue in the small intestine.
• Appendix (परिशेषिका (एपेंडिक्स)) — Listed by NCERT among the secondary lymphoid organs.
• Lymphatic vessels (लसीका वाहिकाएँ) — Carry lymph; lymph nodes sit at different points along them.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 7.5. Report a mistake