. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. STOMACH AND INTESTINE. 357 bowel by reflected light, at a place corre- very characteristic appearance. * In like manner, the villi in their immedi: bourhood often appear to radiate outwards Fig. 269. spending to a cluster of agminate follicles, we manner, the villi in their immediate neigh- see that its surface (wliich is raised above the rest of the intestine, but has no very sharp line of demarcation from it) is occu- pied by a number of irregular shallow de- pressions (I), fig. 267.), at tolerably uniform dis- tances
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. STOMACH AND INTESTINE. 357 bowel by reflected light, at a place corre- very characteristic appearance. * In like manner, the villi in their immedi: bourhood often appear to radiate outwards Fig. 269. spending to a cluster of agminate follicles, we manner, the villi in their immediate neigh- see that its surface (wliich is raised above the rest of the intestine, but has no very sharp line of demarcation from it) is occu- pied by a number of irregular shallow de- pressions (I), fig. 267.), at tolerably uniform dis- tances from each other. But when inspected by transmitted light, these fossa? are replaced Fig. 268. • • - • ". '' i ••>•-•> \ • \ - •J '•£«-*»,'(-a443 • 'v **^b,fig. 268.), of about the size of a millet seed ; the aggre- gation of which renders the whole cluster very distinctly visible by this mode of exami- nation. Finally, the cluster may often be recognised externally, from the bulging of the peritoneal coat which it causes in this situa- tion. Indeed, its constituent follicles may sometimes be seen glimmering through the delicate muscular tunic. Each such cluster is composed of a number of follicles, varying from twenty or thirty in the smaller, to at least one or two hundred in the larger, specimens. A careful examination of the mucous surface shows that the depressions just mentioned do not lead to any apertures, but are terminated by a smooth surface, the convexity of which somewhat diminishes their own depth. It is only at the margins, and in the intervals, of these fossae, that we find the tubes and villi proper to the small in- testine. And both of these latter structures are somewhat modified. Those tubes which immediately surround each depression have a circular or elliptical arrangement ; so that their orifices generally form a ring of ten to twenty tubes in the fossa (around a, fig. 269.), and thus give rise to a. Portion of a cluste
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