Quain's elements of anatomy . From its inner surface muscular bundlesbend inwards into the thickness of the mucous membrane, passingbetween the glands contained within it, and even into its prominences,so as in many cases to reach and become attached to the basement-mem-brane covering them. The muscularis mucosge is a part therefore ofthe mucous membrane, and is not to be confounded with the muscularcoat proper, which forms a separate layer in most of the hollow viscera. The connective tissue layer or corium froiier varies much in structurein different parts. In some situations, as in the gull
Quain's elements of anatomy . From its inner surface muscular bundlesbend inwards into the thickness of the mucous membrane, passingbetween the glands contained within it, and even into its prominences,so as in many cases to reach and become attached to the basement-mem-brane covering them. The muscularis mucosge is a part therefore ofthe mucous membrane, and is not to be confounded with the muscularcoat proper, which forms a separate layer in most of the hollow viscera. The connective tissue layer or corium froiier varies much in structurein different parts. In some situations, as in the gullet, bladder,and vagina, the filamentous connective tissue is abundant, and extendsthroughout its whole thickness, forming a continuous and toler-ably compact web, and rendering the mucous membrane of those partscomparatively stout and tough. In the stomach and intestines, on theother hand, where the membrane is pervaded by tubular glands, the tissuebetween these is chiefly retiform or lymphoid tissue (fig. 218, It) with but. 234 MUCOUS MEMBRANES. few white and elastic fibres, and hence in these situations the membrane,] ough thicker, is far less firm and tough than in parts where much ofthe white connective tissue is found. In other mucous membranestransitions are met with between these two extremes. It frequentljj happens that in certain circumscribed places the tissue is greatly increased in amount, and becomes densely packedwith lymphoid cells. In this way the so-called solitary glands, folliclesor nodules are produced. If there be many lymjDhoid nodulesadjacent to one another, so as to make up a localized patch, a so-calledagminated gland is formed, or if massed together more thickly, alymphoid organ like the tonsil. These collections of lymphoid tissue,which may if large extend, on the one hand, down into the submucoustissue, and on the other, upwards into the epithelium, have been alreadyreferred to (p. 213), and will be more particularly described when th
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