Lymph Node Development
|Embryology - 25 May 2017 Expand to Translate|
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- 1 Introduction
- 2 Some Recent Findings
- 3 Early Development
- 4 Molecular
- 5 Reticular Cells
- 6 Dendritic Cells
- 7 Adult Lymph Node
- 8 Histology
- 9 Adult Lymphocytes
- 10 Lymphocyte Movies
- 11 References
- 12 External Links
- 13 Terms
- 14 Glossary Links
Lymphatic vasculature drains lymph fluid from the organ tissue space and returns it to the blood vasculature for recirculation. Lymph nodes lie on the path of lymph vessels and these structures monitor and carry out immune surveillance of this fluid for antigens and pathogens, trapping them within the lymph nodes and generating immune responses.
In early node development, vein endothelial cells form a spherical body (lymph sac) that is surrounded and then invaded by mesenchymal cells that contribute the lymph node stoma.
The reticular cells that form the stoma of the node were seen as purely structural and supportive, more recent studies have shown that the reticular network that they form is also part of the immune process.
Some Recent Findings
|More recent papers|
This table shows an automated computer PubMed search using the listed sub-heading term.
References listed on the rest of the content page and the associated discussion page (listed under the publication year sub-headings) do include some editorial selection based upon both relevance and availability.
Guangxin Zhong, Lu Chen, Ruihong Yin, Yan Qu, Yongxing Bao, Qiong Xiao, Zhaolin Zhang, Yaqian Shen, Cailing Li, Yun Xu, Zhigeng Zou, Hua Tian Chemokine (C‑C motif) ligand 21/C‑C chemokine receptor type 7 triggers migration and invasion of human lung cancer cells by epithelial‑mesenchymal transition via the extracellular signal‑regulated kinase signaling pathway. Mol Med Rep: 2017; PubMed 28487957
Lei Yu, Guiyu Wang, Qian Zhang, Li Gao, Rui Huang, Yinggang Chen, Qingchao Tang, Jin Liu, Chunjia Liu, Hongwei Wang, Xishan Wang Karyopherin alpha 2 expression is a novel diagnostic and prognostic factor for colorectal cancer. Oncol Lett: 2017, 13(3);1194-1200 PubMed 28454233
Jing-Hua Pan, Hong Zhou, Xiao-Xu Zhao, Hui Ding, Li Wei, Li Qin, Yun-Long Pan Robotic thyroidectomy versus conventional open thyroidectomy for thyroid cancer: a systematic review and meta-analysis. Surg Endosc: 2017; PubMed 28337546
James D Constable, Srinivasalu Bathala, Jacob J Ahmed, Julian A McGlashan Non-recurrent laryngeal nerve with a coexisting contralateral nerve demonstrating extralaryngeal branching. BMJ Case Rep: 2017, 2017; PubMed 28314807
J Sotirović, A Perić, D Vojvodić, N Baletić, I Zaletel, I Stanojević, M Erdoglija, M Milojević Serum cytokine profile of laryngeal squamous cell carcinoma patients. J Laryngol Otol: 2017, 131(5);455-461 PubMed 28294085
- lymph sacs (primitive lymph sacs) form from endothelial cells.
- bud from the veins during early development
- then form buds that branch and form the lymphatic network.
- lymphoid tissue inducer cells - (LTi) first hematopoietic cells to enter and induce lymphoid tissue development.
- expressed by lymphatic endothelial cells.
Mesoderm derived fibroblastic reticular cells (FRCs, RCs) form the stromal supporting network of cells and extracellular matrix in secondary lymphoid organs (lymph nodes, spleen and thymus). These specialized myofibroblasts form the structural "sponge" within lymphoid tissue, through with T cells, B cells, dendritic cells (DCs), plasma cells and macrophages interact and move.
- synthesise reticular fibres (type III collagen) that form the main extracellular matrix component
- differentiate as distinct subpopulations distributed in the cortical and medullar regions
- T cell zone fibroblastic reticular cells (TRCs)
- bind dendritic cells that initiate immunity by presenting antigens to T lymphocytes also initiate remodelling of lymph node RCs
- may regulate cellular traffic and activation of specific lymphocyte populations
Model of Reticular Network Formation
|Accumulation of lymphocytes induces alteration of mesenchymal progenitors.||Lymphocytes and differentiated FRCs gradually degrade preexisting matrix, and FRCs weave RF meshwork from the newly produced components.||Mature RN forms and antigen presentation occur on the stromal reticulum.|
Lymph Node and Reticular Cell Classification
- express myofibroblast markers - desmin, vimentin, CD90, CD73, CD103, α-smooth muscle actin (αSMA) and ERTR7 antigen.
- express - podoplanin (PDPN), platelet-derived growth factor receptor-α (PDGFRA) and genes from antigen presentation and cytokine response pathways.
- lack of expression of CD45 and CD31.
Dendritic cells (DCs, antigen-presenting cells, APCs) present antigens and induce a primary immune response in resting naïve T lymphocytes. These cells originate from the same common progenitor as monocytes. Recently it has been shown that recirculation of antigen-bearing dendritic cells in remote lymphoid organs can prime T cells in other locations.
In 2011 Ralph M. Steinman received half the Nobel Prize half of the award to to Ralph M. Steinman for his discovery of the dendritic cell and its role in adaptive immunity.
Adult Lymph Node
Lymph Node Cartoon Gallery
- Links: Immunobiology - Figure 1.8. Organization of a lymph node | MBoC Figure 24-16. A simplified drawing of a human lymph node
| Schematic representation of the organization of a lymph node.
Mesenteric Lymph Node
Gastrointestinal tract intestine immune overview showing mesenteric lymph nodes.
- Lymph Node Histology: Subcapsular Sinus | Follicle | Germinal Centre | Medullary Cords and Sinuses | High Endothelial Venules | Macrophages | Node cartoons
Adult Lymph Node Structure
- Capsule - dense connective tissue
- Trabeculae - dense connective tissue
- Reticular Tissue - Reticular cells and fibers, supporting meshwork
- Macrophages - process antigen, difficult to distinguish from the reticular cells.
- enters the node through afferent vessels
- filters through the sinuses
- leaves through efferent vessels
Subcapsular sinus = marginal sinus
Continuation of trabecular sinus
Lymphocyte Electron Micrographs
Cell Trafficking into and out of Lymph Nodes
Lymphocyte Traffic in and out of the Lymph Node
Both lymphocyte types:
- Spend 8 to 24 h in the lymph node interstitium.
- Transit across a lymphatic endothelium to exit.
- Enter a network of medullary sinuses.
- Drain from sinuses into efferent lymphatic vessels.
Lymphocyte Migration Speeds
T cells - 10–12 μm/min in the follicle diffuse cortex, peak velocities up to 30 μm/min. (move more slowly in the medullary region near the hilus of the lymph node than in the paracortex)
B cells - 6 μm/min in the follicle diffuse cortex, peak velocities up to 20 μm/min.
Both cortical T cells and follicular B cells move in random directions following "guide cells".
Lymphocyte Guide Cells
FDC - Follicular Dendritic Cells, may guide B cells in the follicle.
FRC - Fibroblastic Reticular Cells, may guide T cells in the follicle.
|Adult Mouse Lymphocyte Motility|
|T cell zone||Medullary sinus|| Sinus endothelial|
|Bi-directional traffic|| Cross the sinus
|T and B cell motility||T and B cell coupling|
|Mouse Immune Movies: Transendothelial migration | T cell zone | Medullary sinus | Sinus endothelial barrier | Bi-directional traffic | cross the sinus endothelial barrier | T and B cell motility | T and B cell coupling | T cell Elimination | Immune System Development | Mouse Development|
- Serge A van de Pavert, Reina E Mebius Development of secondary lymphoid organs in relation to lymphatic vasculature. Adv Anat Embryol Cell Biol: 2014, 214;81-91 PubMed 24276888
- Mark F Vondenhoff, Serge A van de Pavert, Miriam E Dillard, Mascha Greuter, Gera Goverse, Guillermo Oliver, Reina E Mebius Lymph sacs are not required for the initiation of lymph node formation. Development: 2009, 136(1);29-34 PubMed 19060331
- Anne L Fletcher, Sophie E Acton, Konstantin Knoblich Lymph node fibroblastic reticular cells in health and disease. Nat. Rev. Immunol.: 2015; PubMed 25998961
- Tomoya Katakai, Takahiro Hara, Manabu Sugai, Hiroyuki Gonda, Akira Shimizu Lymph node fibroblastic reticular cells construct the stromal reticulum via contact with lymphocytes. J. Exp. Med.: 2004, 200(6);783-95 PubMed 15381731 | J Exp Med.
- H G Alvarenga, L Marti Multifunctional roles of reticular fibroblastic cells: more than meets the eye? J Immunol Res: 2014, 2014;402038 PubMed 24829927 | J Immunol Res.
- Kang Liu, Michel C Nussenzweig Origin and development of dendritic cells. Immunol. Rev.: 2010, 234(1);45-54 PubMed 20193011
- C Hervouet, C Luci, S Bekri, T Juhel, F Bihl, V M Braud, C Czerkinsky, F Anjuère Antigen-bearing dendritic cells from the sublingual mucosa recirculate to distant systemic lymphoid organs to prime mucosal CD8 T cells. Mucosal Immunol: 2014, 7(2);280-91 PubMed 23801305
- Scott N Mueller, Ronald N Germain Stromal cell contributions to the homeostasis and functionality of the immune system. Nat. Rev. Immunol.: 2009, 9(9);618-29 PubMed 19644499 | PMC2785037 | Nat Rev Immunol.
- Andrew J Macpherson, Karen Smith Mesenteric lymph nodes at the center of immune anatomy. J. Exp. Med.: 2006, 203(3);497-500 PubMed 16533891 | PMC2118258 | J Exp Med.
- Masayuki Miyasaka, Toshiyuki Tanaka Lymphocyte trafficking across high endothelial venules: dogmas and enigmas. Nat. Rev. Immunol.: 2004, 4(5);360-70 PubMed 15122201 | Nat Rev Immunol.
- Sindy H Wei, Hugh Rosen, Melanie P Matheu, M Germana Sanna, Sheng-Kai Wang, Euijung Jo, Chi-Huey Wong, Ian Parker, Michael D Cahalan Sphingosine 1-phosphate type 1 receptor agonism inhibits transendothelial migration of medullary T cells to lymphatic sinuses. Nat. Immunol.: 2005, 6(12);1228-35 PubMed 16273098
- Michael D Cahalan, Ian Parker Choreography of cell motility and interaction dynamics imaged by two-photon microscopy in lymphoid organs. Annu. Rev. Immunol.: 2008, 26;585-626 PubMed 18173372
Immunobiology 5th edition The Immune System in Health and Disease Charles A Janeway, Jr, Paul Travers, Mark Walport, and Mark J Shlomchik.
Part I. An Introduction to Immunobiology and Innate Immunity
- Chapter 1. Basic Concepts in Immunology
- The components of the immune system
- Figure 1.3 All the cellular elements of blood, including the lymphocytes of the adaptive immune system, arise from hematopoietic stem cells in the bone marrow
- Figure 1.4 Myeloid cells in innate and adaptive immunity
- Figure 1.5 Lymphocytes are mostly small and inactive cells
- Figure 1.6 Natural killer (NK) cells
- Figure 1.7 The distribution of lymphoid tissues in the body
- Figure 1.8 Organization of a lymph node
- Figure 1.9 Organization of the lymphoid tissues of the spleen
- Summary to Chapter 1
- The components of the immune system
Part III. The Development of Mature Lymphocyte Receptor Repertoires
- Chapter 7. The Development and Survival of Lymphocytes
- Generation of lymphocytes in bone marrow and thymus
- Survival and maturation of lymphocytes in peripheral lymphoid tissues
- Summary to Chapter 7
R P Bailey, L Weiss Light and electron microscopic studies of postcapillary venules in developing human fetal lymph nodes. Am. J. Anat.: 1975, 143(1);43-58 PubMed 165702
R P Bailey, L Weiss Ontogeny of human fetal lymph nodes. Am. J. Anat.: 1975, 142(1);15-27 PubMed 1167215
External Links Notice - The dynamic nature of the internet may mean that some of these listed links may no longer function. If the link no longer works search the web with the link text or name. Links to any external commercial sites are provided for information purposes only and should never be considered an endorsement. UNSW Embryology is provided as an educational resource with no clinical information or commercial affiliation.
- The Jackson Laboratory JAX Mice Strains - Lymphoid Tissue Defects
- Cambridge Immunology Network Dr Louise Gaynor - Immunogenetics of uterine Natural Killer
- adenoid - (Greek " +-oeides = in form of) in the form of a gland, glandular; the pharyngeal tonsil.
- afferent lymph - vessel carrying lymph towards a node.
- acquired immune deficiency syndrome - (AIDS) note this is now better described as "advanced HIV disease", decrease in the number of CD4 T cells. (More? Immunobiology - AIDS)
- anastomose - joining of two tubes or structures together.
- Antibody mediated immunity - the immune function of plasma cells (active B lymphocytes) secreting antibody which binds antigen.
- antibodies - mammals have five classes (IgA, IgD, IgE, IgG, and IgM)
- antigen - any substance that is recognised by the immune system and stimulates antibody production.
- appendix - is a gut-associated lymphoid tissue (GALT) located at the beginning of the colon. The anatomy is as a finger-like structure that arises from the cecum. The length (2.5-13 cm) is longer in both infants and children and also has more abundant lymphatic tissue in early life. The wall structure is similar to the small intestine (though with no villi), nor plicae circularis. Lymph nodules surround the lumen of the gastrointestinal tract and extend from the mucosa into the submucosa.
- B cell - (B-cell, B lymphocyte) historically named after a structure called the bursa of Fabricius in birds, a source of antibody-producing lymphocytes. These immune cells develop in the bone marrow. (More? Electron micrographs of nonactivate and activated lymphocytes)
- B lymphocyte - (B cell, B-cell)
- BALT - (Bronchus Associated Lymphoid Tissue) immune tissue associated with the respiratory tract.
- band cell - (band neutrophil or stab cell) seen in bone marrow smear, a cell undergoing granulopoiesis, derived from a metamyelocyte, and leading to a mature granulocyte. Also occasionally seen in circulating blood.
- cecum - (caecum, Latin, caecus = "blind") within the gastrointestinal tract a pouch that connects the ileum with the ascending colon of the large intestine.
- cell - has a specific cell biology definition, but is often used instead of "lymphocyte" when describing B and T cells.
- cell-mediated immunity - the immune function of T lymphocytes. (More? Immunobiology - T Cell-Mediated Immunity)
- central tolerance - in thymus mediated by cortical epithelial cells, medullary epithelial cells and thymic DCs, involves deletion of self reactive thymocytes (T cell).
- "clockface" - a term used to describe the appearance of plasma cell nuclei due to the clumping of the chromatin at the nucleus periphery. More clearly seen in tissue plasma cells that the bone marrow smear, where they are sometimes confused with the basophilic erythroblasts. Image - plasma cell
- CD - (cluster of differentiation) identifies immunological surface markers on cells.
- CD4+ - (T helper cells) refers to T lymphocytes that express CD4 (glycoprotein of the immunoglobulin superfamily) on their surface. These cells can be infected by human immunodeficiency virus (HIV).
- CD8+ - (cytotoxic T cells) refers to T lymphocytes that express CD8 (glycoprotein of the immunoglobulin superfamily) on their surface.
- "clockface" - a term used to describe the appearance of plasma cell nuclei due to the clumping of the chromatin at the nucleus periphery. More clearly seen in tissue plasma cells that the bone marrow smear, where they are sometimes confused with the basophilic erythroblasts.
- cords of Billroth - spleen cellular columns located in red pulp. surrounded by splenic sinusoids. Cords contain reticular cells, macrophages, lymphocytes, plasma cells and erythrocytes.
- cortex - outer layer, used in association with medulla (innner layer or core) a general description that can be applied to describing an organ with a layered structure.
- dendritic cell - (DC, antigen-presenting cell, APC) cells that present antigens and induce a primary immune response in resting naïve T lymphocytes. Originate from the same common progenitor as monocytes (PMID 20193011). In 2011 Ralph M. Steinman received half the Nobel Prize half of the award to to Ralph M. Steinman for his discovery of the dendritic cell and its role in adaptive immunity.
- Effector cells - the immune functioning (active) B and T lymphocytes.
- Efferent lymph - vessel carrying lymph away from a node.
- fibroblastic reticular cell - (FRC) specialized myofibroblasts that form the structural mesenchymal network "sponge" within lymphoid tissue, through which T cells, B cells, dendritic cells (DCs), plasma cells and macrophages move and interact.
- GALT - Gut Associated Lymphatic Tissue consisting of Peyer’s patches, isolated lymphoid follicles and mesenteric lymph nodes.
- haemopoiesis (hemopoiesis) formation of blood cells.
- Hassall's corpuscle - thymic corpuscle.
- high endothelial venule - (HEV) the specialised post-capillary venous region that enables blood lymphocytes to enter a lymph node. These specialised post-capillary venules enables blood lymphocytes to enter a lymph node. Their endothelial cells express ligands that bind lymphocytes, aiding their adhesion and subsequent transmigration into the lymph node.
- humoral immune response - production of antibody by plasma cells derived from B lymphocytes (B cells).
- IEL - Intraepithelial Lymphocyte are T lymphocytes located in the gastrointestinal tract epithelium. Natural IELs (previously ‘type b’ IELs) acquire activated phenotype during development in the thymus in the presence of self antigens. Induced IELs (previously ‘type a’ IELs) progeny of conventional T cells activated post-thymically in response to peripheral antigens.
- IgA - the main class of antibody in secretions (saliva, tears, milk, and respiratory and intestinal secretions).
- IgD - the immunoglobulin B cell starts to produce as a cell-surface molecule after leaving the bone marrow.
- IgE - bind Fc receptors (surface of mast cells in tissues and basophils in the blood) release of potent pro inflammatory molecules mediators of allergic reactions.
- IgG - the major class of immunoglobulin in the blood.
- IgM - the first class of antibody made by a developing B cell, which may switch to making other classes of antibody.
- immunodeficiency - when one or more components of the immune system is defective. (More? Immunobiology - immunodeficiency)
- immunoglobulin - (antibody, Ab) protein produced by plasma cells.
- intraepithelial lymphocyte (IEL) immune cells residing in the gastrointestinal tract epithelium. image - Intraepithelial lymphocyte differentiation
- involution - in the thymus refers to the replacement, mainly in the cortex, of cells by adipose tissue. (More? PubMed- thymus involution) | Cancer Medicine - Thymomas and Thymic Tumors)
- Kupffer cells - stellate macrophage cells located in the liver sinusoids, named after Karl Wilhelm von Kupffer (1829 - 1902) a German anatomist who originally identified these cells. (More? Liver Development)
- lacteal - term used to describe the lymphatic vessels of the small intestine.
- lamina propria - a layer of loose connective tissue found underneath an epithelium, together with the epithelium described as mucosa.
- Langerhans cell - (LC, dendritic cell) Antigen-presenting immune cell found mainly in the basal/suprabasal layers of adult skin and mucosa. Cells lie in the basal/suprabasal layers of stratified epidermal and mucosal tissues. First in the innate antiviral immune defines and can migrate to lymph nodes and induce a T cell–mediated adaptive immune response. (More? Integumentary | Immune System Development)
- Leukocyte - (Greek, lukos = clear, white) white blood cell.
- lingual - related to the tongue.
- lymph node - connective tissue encapsulated lymphoid organ (1mm - 2cm in size), positioned in the pathway of lymph vessels. (More? Lymph Node Development)
- lymphangion - the functional unit of a lymph vessel that lies between two semilunar (half moon-shaped) valves.
- M cell - (microfold cell) found in the follicle-associated epithelium of the Peyer's patch. Function to transport gut lumen organisms and particles to immune cells across the epithelial barrier.
- macrophage - a large highly motile white blood cell which engulfs foreign material (bacteria etc) and both degenerating cells and cell fragments. Differentiates from a monocyte and found in many different tissues and locations. Current theory suggests tissue macrophage is also derived from resident stem cell population in many tissues. More? Immunobiology - Defects in phagocytic cells are associated with persistence of bacterial infection)
- MALT - Mucosa Associated Lymphoid Tissue
- medulla - inner layer or core, used in association with cortex (outer layer) a general description that can be applied to describing an organ with a layered structure.
- Memory Cell - effector T cell (lymphocyte)
- mesenteric lymph nodes - Part of GALT as well as being involved in gut-draining. image - mesenteric lymph nodes
- Mononuclear Phagocytic System - (MPS, Lymphoreticular System, Reticuloendothelial System, RES) Consists of circulating monocytes in the peripheral blood and non-circulating (fixed) tissue macrophages (MΦ) located in tissues and organs.
- negative selection - T cells bearing autoreactive T cell antigen receptors (TCRs) are eliminated during their development in the thymus, protects against autoimmunity.
- normoblast - seen in bone marrow smear, a developing erythroblast (red blood cell) that still retains a nucleus.
- nude mice - (nu/nu) mice which are congenitally hairless and athymic, therefore they do not reject tissue and tumor grafts.
- parenchyma - (Greek = enkeim "to pour in") cells forming the functional cells of an organ or tissue. These cells carry out the function of the organ at a cellular level, and are not the structural cells, connective tissue, extracellular matrix (stromal).
- periarterial lymphoid sheath - (PALS) in the spleen the white pulp that surrounds the central arteries. (T-lymphocytes,macrophages and plasma cells)
- Plasma Cell - active B cell (lymphocyte) which is secreting antibody. Located in either bone marrow or peripheral lymphoid tissues, these cells have and increased cytoplasmic volume (due to increase rough endoplasmic reticulum) in comparison to the inactive (non-secreting) lymphocyte.
- red pulp - spleen region, organized as cell cords (splenic cords, cords of Billroth) and vascular sinuses.
- regulatory T cells - (Tregs) maintain self tolerance and suppress pathological immune responses by control of immune response to non-self antigens.
- sentinel lymph node - the hypothetical first lymph node or group of nodes reached by metastasizing cancer cells from a primary tumour.
- splenic sinusoids - enlarged spleen capillary spaces located in red pulp and surrounding cords of Billroth.
- stroma - (Greek = "a cover, table-cloth, bedding") tissue forming the framework/support of an organ or tissue. That is the structural cells which form connective tissue and secrete extracellular matrix, rather than the functional cells (parenchymal). All organs can therefore be functionally divided into these 2 components, stromal/parenchymal.
- Subcapsular sinus (=marginal sinus) space lying under the connective tissue capsule which receives lymph from afferent lymphatic vessels.
- T cell - (T-cell, T lymphocyte) named after thymus, where they develop, the active cell is responsible for cell-mediated immunity (killer T cells and helper T cells). Cells express T-cell receptor on surface and directly kill virally or bacterially infected cells. These cells can themselves be infected by HIV. (More? Electron micrographs of nonactivate and activated lymphocytes)
- T cell activation - (T lymphocyte activation)The activation process begins with T-cells searching for and encountering antigen-bearing dendritic cells within lymph nodes.
- Thymic corpuscle (=Hassall's corpuscle) a mass of concentric epithelioreticular cells found in the thymus. The number present and size tend to increase with thymus age. (see classical description of Hammar, J. A. 1903 Zur Histogenese und Involution der Thymusdriise. Anat. Anz., 27: 1909 Fiinfzig Jahre Thymusforschung. Ergebn. Anat. Entwickl-gesch. 19: 1-274.)
- thymic epitheliocytes - reticular cells located in the thymus cortex that ensheathe the cortical capillaries, creating and maintain the microenvironment necessary for the development of T-lymphocytes in the cortex.
- T helper cells - (helper T-cells) (Th cells, CD4+) refers to T lymphocytes that when mature express CD4 (glycoprotein of the immunoglobulin superfamily) on their surface.
- T lymphocyte - (T cell, T-cell).
- thymus - an immune/endocrine (thymic hormone) organ involved in the maturation of T lymphocytes (T-cells). Thymus Development
- tonsils - lymph nodules embedded in the mucus membranes located at the back of the mouth and top of the throat. The overlying epithelium helps identify the location.
- vermiform appendix - see appendix, anatomical region containing gut-associated lymphoid tissue located within the gastrointestinal tract at the beginning of the colon. The anatomy is as a finger-like structure that arises from the cecum. The length (2.5-13 cm) is longer in both infants and children and also has more abundant lymphatic tissue in early life. The wall structure is similar to the small intestine (though with no villi), nor plicae circularis. Lymph nodules surround the lumen of the gastrointestinal tract and extend from the mucosa into the submucosa.
- VDJ recombination - (variable, diversity and joining gene segments) genetic recombination event that occurs in immune cell maturation in primary lymphoid organs, B cells ((bone marrow) and T cells (thymus).
- white pulp - (Malpighian bodies of the spleen, splenic lymphoid nodules) spleen lymphoid region, organized as lymphoid sheaths with both T-cell and B-cell compartments, around the branching arterial vessels (resembles lymph node structure).
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Cite this page: Hill, M.A. 2017 Embryology Lymph Node Development. Retrieved May 25, 2017, from https://embryology.med.unsw.edu.au/embryology/index.php/Lymph_Node_Development
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