File:Arey1924 fig200.jpg

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Fig. 200. Profile reconstruction of the primitive lymphatic system in a human embryo of two months

(redrawn after Sabin) X 3.

Paired lymph glands appear during the third month, first in the axillary, iliac, and maxillary regions (Fig. 200). Those replacing the lymph sacs develop later. Primitive sinuses, with simple connective-tissue septa, mark the primary stage of development. Ordinarily it has been believed that the sinuses represent lymphatic plexuses, but recent investigators (Downey, 1922) claim they are channels in the reticulum, originating as clefts in the mesenchyme and acquiring secondary lymphatic connections. Lymphocytes collect in the stroma, forming cortical nodules which become associated with blood capillaries and after birth acquire germinal centers (Fig. 201 A). The peripheral sinus organizes and connects with afferent and efferent lymphatics; the central sinuses cut the lymphoid tissue into medullary cords (Fig. 201 B). The connective tissue differentiates into a fibrous capsule from which trabeculce dip into the gland.

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   Developmental Anatomy 1924: 1 The Germ Cells and Fertilization | 2 Cleavage and the Origin of the Germ Layers | 3 Implantation and Fetal Membranes | 4 Age, Body Form and Growth Changes | 5 The Digestive System | 6 The Respiratory System | 7 The Mesenteries and Coelom | 8 The Urogenital System | 9 The Vascular System | 10 The Skeletal System | 11 The Muscular System | 12 The Integumentary System | 13 The Central Nervous System | 14 The Peripheral Nervous System | 15 The Sense Organs | C16 The Study of Chick Embryos | 17 The Study of Pig Embryos | Figures Leslie Arey.jpg


Arey LB. Developmental Anatomy. (1924) W.B. Saunders Company, Philadelphia.

Cite this page: Hill, M.A. (2024, June 19) Embryology Arey1924 fig200.jpg. Retrieved from

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