THE STRUCTURE OF THE CEREBRUM. 



169 



Fig. 50. Motor neurone. (After Barker.} 



a.h. Axone-hillock devoid of Nissl bodies, and showing fibrillation, ax. Axis cylinder or 

 axone; this process near the cell -body, becomes surrounded by myelin. m., and a cellular 

 sheath, the neurilemma, the latter not being an integral part of the neurone, c. Cytoplasm 

 showing Nissl bodies and lighter ground substance, d. Protoplasmic processes (dendrites) 

 containing Nissl bodies, n. Nucleus, n'. Nucleolus. n.R. Node of Ranvier. s.f. Side 

 fibrils, collaterals, n. of n. Nucleus of neurilemma sheath, tel. Motor end plate or teloden- 

 drion. m. Striped muscle fiber. s.L. Segmentation of Lantermann. 



