764 



THE NERVOUS SYSTEM 



the 'neuromuscular spindle.' In it, the axone penetrates the sarcolemma and breaks into 

 telodendria which coil spirally about the muscle fibre. The most extensive and elaborate form 

 of sensory telodendria are those which spread out in plate-form upon tendons sheaths. 



Fig. 606. — Schemes showing Two Forms of Synapses or thb Termin.\tion of Axones upon 



Cell-bodies of other Neurones. 

 A. In ventral horn of spinal cord. B. In spinal ganglia. 



Fig. 607. — Drawings Illustrating two General Types of Arrangement of Neuro- 



FIBRILLiB in THE CeLL-BODIES OF NeURONES. 



A, cell-body of spinal-ganglion neurone. B, selected "giant pyramidal cell" from cerebral 



cortex, human, a, axone. 



\ 



Motor peripheral axones terminate upon muscle and upon the secretory cell of glands 

 (secretory axones). The motor crunio-spinal axones terminate upon skeletal (voluntary) muscle 

 fibres and upon the cell-bodi«s of sympathetic neurones, the axones of which latter terminate 

 upon cardiac muscle, smootli muscle fibres, and (secretory) in glands. Upon skeletal muscle, 

 the terminal branch of the axone loses its sheath and breaks up into numerous telodendria which 

 themselves branch and show very evident, irregular varicosities, the whole of which spread out 



