454 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



3. The olfactory region is usually confined to the 

 superior turbinated bone and to the adjacent nasal 

 septum. In the fresh condition the region may be 



Fig. 312. Diagram of the connections of cells and fibers in the ol- 

 factory bulb: olf. c, cells of the olfactory mucous membrane; olj. n, 

 deepest layer of the bulb, composed of the olfactory nerve fibers which 

 are prolonged from the olfactory cells; gl, olfactory glomeruli, containing 

 arborization of the olfactory nerve fibers and of the dendrons of the mitral 

 cells; me, mitral cells; a, thin axis-cylinder process passing toward the 

 nerve-fiber layer, n. tr, of the bulb to become continuous with fibers of 

 the olfactory tract; these axis-cylinder processes are seen to give off 

 collaterals, some of which pass again into the deeper layers of the bulb; 

 n', a nerve fiber from the olfactory tract ramifying in the gray matter of 

 the bulb (Schafer). 



distinguished by its yellow color, which is due to 

 pigment in the sustentacular epithelial cells. 



The olfactory cells are true bipolar ganglion cells. 

 The upper process of these cells reaches to the free 



