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Adenoid or retiform tissue consists of a very delicate network of minute fibrils, formed originally by the union of processes of branched connective-tissue corpuscles, the nuclei of which, however, are visible only during the early periods of development of the tissue. Shown is part of a section of a lymphatic gland from which the corpuscles have been for the most part removed, showing the adenoid reticulumn.

Section of the Lymphatic Gland Showing the Adenoid Reticulumn

Adenoid or retiform tissue consists of a very delicate network of minute fibrils, formed originally…

A lymphatic gland, with several vessels passing through it.

A Lymphatic Gland

A lymphatic gland, with several vessels passing through it.

Section of a lymphatic gland. Labels: a, capsule; b, trabeculae of cortical portion; c, trabeculae of medullary portion; d, e, lymphoid contents of loculi; f, afferent vessels; g, their confluence, leading to h, the efferent vessel.

Lymphatic Gland of a Horse

Section of a lymphatic gland. Labels: a, capsule; b, trabeculae of cortical portion; c, trabeculae of…

Diagrammatic section of lymphatic gland. Labels: a.l., afferent lymphatic; e.l., efferent lymphatic; c, capsule, or envelope; tr, trabeculae; l.s., lymph-sinus; l.h., pulpy substance of gland.

Diagrammatic Section of a Lymphatic Gland (Lymph Node)

Diagrammatic section of lymphatic gland. Labels: a.l., afferent lymphatic; e.l., efferent lymphatic;…

Diagrammatic section of lymphatic gland. a.l., afferent; e.l., efferent lymphatics: C, cortical substance; l.h., reticulating cords of medullary substance; l.s., lymph-sinus; c, fibrous coat sending in trabeculae; t.r., into the substance of the gland.

Diagrammatic Section of Lymphatic Gland

Diagrammatic section of lymphatic gland. a.l., afferent; e.l., efferent lymphatics: C, cortical substance;…

Vertical section of a portion of a Peyer's Patch, with lacteal vessels injected. Labels: a, villi, with their lacteals colored black; d, surface of rounded follicle, or solitary gland; e, central part; f,g,h,i, and k, lymph-channels, or lacteal vessels, colored black. "Closely connected with the lymphatic vessels in the intestines are small, rounded bodies of the size of a small pin's head, called solitary glands or follicles. These bodies consist of a rounded mass of fine lymphoid tissue, the meshes of which are crowded with leucocytes. A Peyer's patch, or agminated gland, as it is often called, is simply a collection of these follicles."— Kimber, 1907

Peyer's Patch

Vertical section of a portion of a Peyer's Patch, with lacteal vessels injected. Labels: a, villi, with…