SIMPLE RIGID SUPPORTING TISSUES 



57 



changes of the tissue are produced by an increased formation, or a destruc- 

 tion of, the connective materials under the influence of the cells to which 

 they belong. No tissue responds more quickly than connective tissue 

 does to a sudden development due to exercise. When the muscles 

 enlarge and grow stronger by practice, the tendon and the bone both do 

 the same at the same time and at the same proportional rate of speed. 

 Technic. This will be indicated under the following parts. 



LITERATURE 

 Read general works, especially the early discussion of connective tissues in Schneider. 



THE SUPPORTING AND CONNECTIVE TISSUES : SIMPLE RIGID 



FORMS 



A Primitive Form of Rigid Connective-tissue Cell. " Leidig's cell 

 of the first order " in a crustacean, Homarus. In various parts of the 

 internal anatomy of the 

 lobster and nearly related 

 Crustacea are placed 

 masses of supporting tis- 

 sue. These masses uphold 

 and support the various 

 delicate tissues about them 

 and protect them from 

 the impact of surrounding 

 organs. The largest and 

 most regular of the cells 

 which compose this tissue 

 are known as "LEIDIG'S 

 cells of the first order," 

 named after their discov- 

 erer (Fig. 59). 



The large, well-formed 



eyt.m. 



-cyt. p. 



FIG. 59. Connective tissue cells from the lobster, cyt.m., 

 cytoplasmic mass; cyt.p., cytoplasmic processes; per., pe- 

 ripheral layer of cytoplasm on which the rigid material is 

 laid down. 



nucleus occupies the cen- 

 tral part of each cell. 

 It appears to lie outside 

 of the main central body of the cytoplasm. This is due to its extreme 

 eccentric position in the cytoplasm, the bulk of which forms a dull gray 

 mass lying apparently alongside of the nucleus. This cytoplasmic mass 

 shows in its body a darkly staining area that is round in outline and 

 much smaller than the nucleus. This is probably the centrosphere, 

 containing the centrosome. 



