212 



ELEMENTS OF BIOLOGY 



ample, a taste bud, and each branch of the efferent fibre, the axone, 

 communicates with the dendrite of one or more other neurons. The 

 arrangement of the fibres of neurons that conduct stimuU to the 



CORTEX 



BRAIN 



MOTOR FIBER 

 SENSORr FIBER 



SPINAL CORD 



DORSAL ROOT 



VENTRAL ROOT 



SPINAL NERVE 



SENSORY NERVE 

 FIBER ENDING IN 

 SENSE CELL 



■ MOTOR NERVE 



FIBER E//DING 



IN MUSCLE 



Fig. 141. — Scheme of nerve tracts in a mammal. (After Woodruff: Animal Biology, 



published by The Macmillan Company.) 



muscles, or, motor nerves, is similar but reversed. Dendrites of 

 motor nerves communicate with the axones of other nerves, while 

 the axones finally communicate with muscle cells. A tract (Fig. 



