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false. NOT ALL lymphoid organs develop from mesoderm.
Lymphatic tissues - develop by the end of the fifth week of embryonic development. develop from lymph sacs that arise from developing veins, which are derived frommesoderm.
The first lymph sacs -paired jugular lymph sacs at the junction of the internal jugular and subclavian veins. From there, lymphatic capillary plexuses spread to the thorax, upper limbs, neck and head. (Some enlarge, form lymphatic vessels)
Each jugular lymph sac retains at least one connection with its jugular vein, the left one developing into the superior portion of the thoracic duct.
unpaired retroperitoneal lymph sac -at the root of the mesentery of the intestine. It develops from the primitive vena cava and mesonephric veins. The sac establishes connections with the cisterna chyli but loses its connectionswith neighboring veins.
paired posterior lymph sacs, develop from the iliac veins. - produce capillary plexuses and lymphatic vessels of the abdominal wall, pelvic region, and lower limbs - join the cisterna chyli and lose their connections with adjacent veins.
anterior part of the sac from which the cisterna chyli develops, all lymph sacs become invaded by mesenchymal cells and are converted into groups of lymph nodes.
spleen= develops from mesenchymal cells between layers of the dorsal mesentery of the stomach.
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∙ 12y ago
No, lymphoid organs develop from a combination of mesoderm and endoderm. Mesoderm gives rise to the stromal components of lymphoid organs, while endoderm contributes to the formation of epithelial components such as the thymus and gut-associated lymphoid tissue.
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All the lymphoid organs are well developed before birth?
no
What does endoderm give rise to?
Germ layers give rise to all of animal's tissue and organs.
When does organogenesis occur?
Organogenesis is the process by which a mass of cells in a developing embryo differentiates and develops into a functioning organ. In the embryo, all cells are basically stem cells and all alike. Once the process of organogenesis takes place and the beginnings of specialized organs form, the fetal stage begins.
What type of tissue is commonly found in all lymphoid organs and tissues excluding the thymus?
reticular connective tissue
What are the characteristics associated with all animals that are bilaterally symmetrical at some point in their life cycle?
The mesoderm and cephalization are characteristics associated with all animals that display bilateral symmetry at some point in their lives. The mesoderm is a germ layer and cephalization is when nervous control and sense organs are located in an organism's head.
What is a primary lymphatic organ?
The primary lymphoid organs in the body are the lymph nodes. This is incorrect. Primary lymphatic organs are site where stem cells divide and become immunocompetent, capable of mounting an immune response. Therefore the primary lymphatic organs are the Red bone Marrow, in flat bones and epiphyses of long bones, and in the Thymus.
Which germ layer is destined to become the inner of the body organs?
endoderm
What is a coelom?
Coelomates are animals that have body cavities with complete linings, filled with fluid, that maintain the juxtaposition of the internal organs. All vertebrates, and most bilateral animals are coelomates.
Trimester during pregnancy when the major organs are developed?
All the organs of the baby develop in first trimester. Means in first three months ofpregnancy.
Do all tissues come from the same embryonic origin?
No, human tissues are arise from one of 3 embryological origins: 1- Ectoderm 2- Mesoderm 3- Mesoderm
How can one cell become one baby with all its organs?
one cell can become one baby becuase it is in a seperate egg and it starts to grow and develop its organs
What are all parts of the lymphatic system?
The lymphatic system can be broadly divided into the conducting system and the lymphoid tissue. The conducting system carries the lymph and consists of tubular vessels that include the lymph capillaries, the lymph vessels, and the right and left thoracic ducts. The lymphoid tissue is primarily involved in immune responses and consists of lymphocytes and other white blood cells enmeshed in connective tissue through which the lymph passes. Regions of the lymphoid tissue that are densely packed with lymphocytes are known as lymphoid follicles. Lymphoid tissue can either be structurally well organized as lymph nodes or may consist of loosely organized lymphoid follicles known as the Mucosa-Associated Lymohoid Tissue (MALT) The central or primary lymphoid organs generate lymphocytes from immature progenitor cells. The Thymus and the Bone Marrow constitute the primary lymphoid tissues involved in the production and early selection of lymphocytes. Secondary or peripheral lymphoid organs maintain mature naive lymphocytes and initiate an adaptive immune response. The peripheral lymphoid organs are the sites of lymphocyte activation by antigen. Activation leads to clonal expansion and affinity maturation. Mature lymphocytes recirculate between the blood and the peripheral lymphoid organs until they encounter their specific antigen. Secondary lymphoid tissue provides the environment for the foreign or altered native molecules (Antigens) to interact with the lymphocytes. It is exemplified by the lymph nodes , and the lymphoid follicles in Tonsils, Peyer's Patches, Spleen, adenoids, Skin, etc. that are associated with the (MALT).
