CHAPTER 10
Lymphoid System
187
Figure 10-6.
Overview of the lymphoid organs.
Locations of the principal lymphoid organs and vessels are shown on the
left
; the route of lymph drainage is shown on the
right
.
Structures of the Lymphoid Tissues and Organs
Thoracic
duct
Subclavian
vein
Right lymphatic duct
Peyer
patches
(ileum)
Appendix
Bone marrow
Palatine
tonsil
Lymph node
(inguinal node)
Lymph node
(popliteal node)
Lymph node
(axillary node)
Thoracic duct
Lymphatic vessel
Thymus
Lymph node
(cervical node)
Spleen
Pharyngeal
tonsil
Lymph
Lymphatic capillaries
Lymphatic vessels
Lymph nodes
Lymphoid
organs
Lymphatic
tissue
Lymphatic vessels
Afferent lymphatic vessels
Efferent lymphatic vessels
Right lymphatic duct
Subclavian veins
Thoracic duct (left)
I. Mucosa-associated lymphoid tissue
A.
Gut-associated lymphoid tissue:
Lymphatic tissue in the
mucosa of the digestive tract, such as Peyer patches in
ileum and nodules in the appendix.
B.
Bronchus-associated lymphoid tissue:
Lymphatic tissue
in the mucosa of the respiratory tract, such as lymphatic
tissue in bronchi, bronchioles.
C. Tonsils
1. Palatine tonsils
2. Pharyngeal tonsils
3. Lingual tonsils
II. Lymphoid organs
A. Bone marrow
(see Chapter 9, “Circulatory System”)
B. Thymus
1. Cortex
2. Medulla
C. Lymph nodes
1. Afferent lymphatic vessels
2. Efferent lymphatic vessels
3. Cortex
4. Paracortex
5. Medulla
D. Spleen
1. White pulp
2. Red pulp
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