. A class book of (elementary) practical physiology : including histology, chemical and experimental physiology. Physiology. riU.\Ti:i> EPITHELIUM. 31 these as cells in a .state of proliferation. Chalice cells, unicellular mucous glands, are numerous amongst the columnar cells. Some are full of a transparent secretion (mucigefa), others empty and collapsed. The former are like footless wineglasses. Leucocytes occur frequently between the cells. Ciliated Epithelium. Trachea of a child. (p. 8, s. 22 & 24, c. P., m. B.) (L) Find the inner layer. (II) The free surface is covered with c
. A class book of (elementary) practical physiology : including histology, chemical and experimental physiology. Physiology. riU.\Ti:i> EPITHELIUM. 31 these as cells in a .state of proliferation. Chalice cells, unicellular mucous glands, are numerous amongst the columnar cells. Some are full of a transparent secretion (mucigefa), others empty and collapsed. The former are like footless wineglasses. Leucocytes occur frequently between the cells. Ciliated Epithelium. Trachea of a child. (p. 8, s. 22 & 24, c. P., m. B.) (L) Find the inner layer. (II) The free surface is covered with columnar ciliated epithelium, the lower layers of cells are pear-shaped or rounded, and rest upon a well defined basement surface. The epithelium is renewed by the proliferation of the lowest cells. Isolated ciliated cells from the pharynx of the frog (p. 24 to 4^ hours in 33 pa alcohol, coloured by Picrocarmine (Ranvier) m. Gl.) (H) Irregular wedge-shaped nucleated cells, the free ends of which are tufted with cilia implanted in a marginal zone. Chalice cells, some full of granules (mucigen.) stained yellow, others empty, occur in considerable numbers. Ciliary Open a mussel by cutting through the hinge, Fig. 11, then pass the knife between the shells to sever the adductor A and soft parts. The thick border of the mantle lies within the long side of the shell. It retracts on being touched if the mussel is alive. Lying upon the mantle in a double layer is the gill. Cut out a small piece of the gill witli scissors, place it on a cover- glass in a drop of fluid from the mussel, and separate the two layers. Invert the preparation (hanging drop) upon a cell formed of three thicknesses of blotting paper, *ut so as to fit the slide, and with a central aperture § inch in diameter, and moisten with salt solution. Fig. Fie. n. A scraping from the pharynx of the frog diffused in normal saline answers very Please note that these images are extracted from scanned page i
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