. A compend of human physiology; especially adapted for the use of medical students. Physiology. 34 HUMAN PHYSIOLOGY. Under high powers of the microscope the cell protoplasm is found to be pervaded by a network of fibers, termed spongioplasm, in the meshes of which is contained a clearer and more fluent substance, the hyaloplasm. The relative amount of these two constituents varies in different cells, the proportion of hyaloplasm being usually greater in young cells. The arrangement of the fibers forming the spongioplasm also varies, the fibers having sometimes a radial direction, in others a
. A compend of human physiology; especially adapted for the use of medical students. Physiology. 34 HUMAN PHYSIOLOGY. Under high powers of the microscope the cell protoplasm is found to be pervaded by a network of fibers, termed spongioplasm, in the meshes of which is contained a clearer and more fluent substance, the hyaloplasm. The relative amount of these two constituents varies in different cells, the proportion of hyaloplasm being usually greater in young cells. The arrangement of the fibers forming the spongioplasm also varies, the fibers having sometimes a radial direction, in others a concentric disposition, but most frequently being distributed evenly in all directions. In many cells the outer portion of the cell protoplasm undergoes chemic changes and is transformed into a thin, transparent, homogeneous membrane,—the cell membrane,—which completely incloses the cell substance. The cell mem- Nuclear mem- brane. Linin. Nuclear fluid (matrix). Nucleolus. Chromatin cords (nuclear network). Nodal enlarge- ments of the Cell membrane. Exoplasm. Microsomes. Centrosome Spongioplasm. Hyaloplasm. Foreign inclo- sures. Fig. 2.—Diagram of a Cell. Microsomes and spongioplasm are only partly drawn. brane is permeable to water and watery solutions of various inorganic and organic substances. It is, however, not an essential part of the cell. The nucleus is a small vesicular body embedded in the protoplasm near the center of the cell. In the resting condition of the cell it consists of a distinct membrane, composed of amphipyrenin^ inclosing the nuclear con- tents. The latter consists of a homogeneous amorphous substance,—the nuclear matrix,—in which is embedded the nuclear network. It can often be seen that a portion of one side of the nucleus, called the pole, is free from. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may
Size: 1429px × 1748px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiology, bookyear1
