Manual of human histology . e naked eye; it leads into a funnel-shaped cavity, which is remarkable on the one hand for itsnarrowness, in relation to the size of the sac, and on the other,for its thick walls, and is usually filled with a greyish mucousmaterial. Each follicle (fig. 181) is a thick-coated capsule, externallysurrounded by a fibrous investment connected with the deeplayers of the mucous Fig. i8i. membrane; internally,it is lined by a processof the mucous mem-brane of the oral cavity,with its papillse andepithelium, and con-tains between the two,imbedded in a delicate,fibrous, vascu
Manual of human histology . e naked eye; it leads into a funnel-shaped cavity, which is remarkable on the one hand for itsnarrowness, in relation to the size of the sac, and on the other,for its thick walls, and is usually filled with a greyish mucousmaterial. Each follicle (fig. 181) is a thick-coated capsule, externallysurrounded by a fibrous investment connected with the deeplayers of the mucous Fig. i8i. membrane; internally,it is lined by a processof the mucous mem-brane of the oral cavity,with its papillse andepithelium, and con-tains between the two,imbedded in a delicate,fibrous, vascular matrix, a certain number of large, com-pletely closed capsules or follicles (fig. 181, g), whichare about i—\ in diameter, round or elongated in form. Fig. 181. Follicular gland from the root of the tongue in Man: a, epitheliumlining it; b, papillae; c, external surface of the follicular gland, with the coat of con-nective tissue; e, cavity of the gland; /, epithelium; g, follicle in the thick vrall ofthe gland; x 30 SPECIAL HISTOLOGY. present a whitish colour, and closely resemble the capsulesof Peyers patches, the solitary glands, the vesicles of the spleenand of the lymphatic glands. They consist of a tolerably solidcoat, about 0002—•003 thick, composed of more homogeneousconnective tissue, without elastic fibres, and of greyish whitecontents, which, when the follicle is pricked, exude in the formof a drop, which becomes diffused through water, and consistsof a fluid with formed particles. The former, alkaline in itsreaction, is present in excessively small quantity, so that itappears to be merely the connecting medium of the latter,which consist of cells of 0003—0005 and free nuclei of0-002—0-0025 without any determinate character. Aceticacid renders the cells granular, and thence communicates awhitish tinge to the contents; but it precipitates no mucus,the fluid differing decidedly in this respect from the ordinarymucous secretion and agreeing with that
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Keywords: ., bookcentury1800, bookdecade1850, booksubjecthistolo, bookyear1853
