. Principles of modern biology. Biology. NUCLEUS CYTOPLASM BRANCH NODE OF RANVIER TERMINAL BRANCHES which is called the myelin or medullary sheath. However, some nerves, particularly in the autonomic system (p. 465), are non- myelinated. Connective (Sustentive) Tissues. The con- nective tissues bind the other tissues together, giving substantial form to each organ, and connecting and supporting the various or- gans. In all connective tissues, the intercellu- lar matrix is far more conspicuous than the cells by which this matrix is secreted. In fact, the character of the matrix mainly deter- mi
. Principles of modern biology. Biology. NUCLEUS CYTOPLASM BRANCH NODE OF RANVIER TERMINAL BRANCHES which is called the myelin or medullary sheath. However, some nerves, particularly in the autonomic system (p. 465), are non- myelinated. Connective (Sustentive) Tissues. The con- nective tissues bind the other tissues together, giving substantial form to each organ, and connecting and supporting the various or- gans. In all connective tissues, the intercellu- lar matrix is far more conspicuous than the cells by which this matrix is secreted. In fact, the character of the matrix mainly deter- mines the propei ties of the particular kind of connective tissue in question—as may be noted in the following description. 1. Fibrillar Connective Tissues. The matrix of the fibrillar tissues is characterized by the presence of numerous nonliving fibers, which form dense interlacing networks or thick parallel strands. The fibroblasts, or cells that form the matrix, are usually difficult to see among the fibers. They are inconspicu- ous amoeboid cells, capable of migrating to the various parts of the tissue. The chemical nature of the fibers differs in different con- nective tissues. In general, two main types are recognized: (a) white fibers, which are relatively delicate and inelastic, and (b) yel- low fibers, which are stouter and more elastic. White fibrous connective tissue is widely dis-. Fig. 15-15. A neuron, or nerve cell. Fig. 15-16. Hyaline cartilage. One to several carti- lage-producing cells (chondroblasts) occupy each of the spaces (lacunae) in the chondrin matrix. (From The Living Body, by Best and Taylor. Holt, Rinehart and Winston, Inc.). 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 not perfectly resemble the original Marsland, Douglas, 1899-. New York, Holt, Rinehart and Winston
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