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hij;. 3. Transverse secnon through the predeimne layer. (.)dontoblastic processes, luimecl b> a eell nieii.brane, 

 contain a cytoplasmic mass rich in small filaments, ribosome-like structures and some scarce endoplasmic reti- 

 culum vesicles (ER). Numerous collagen fibrils (CO) embedded in a transparent ground substance separate 



adjacent odontoblastic processes (-•; 28,000) 

 Fig. 4. Transverse section through an odontoblastic process (OP) in the predentlne layer. A transverse section 

 of an unmyelinated nerve fibre can be seen in close association to the process. The axoplasm contains numerous 

 mitochondria and some synaptic vesicle-like structures (SV). CO = non calcified collageneous matrix of pre- 

 dentlne (■ 67,000) 



