Early adventures in Persia, Susiana, and Babylonia, including a residence among the Bakhtiyari and other wild tribes before the discovery of Nineveh . Fig. I.—Pyramidalcell from cerebrum.(From HalliburtonsHandbook of Physi-ology.) loo THE EDUCATION OF BEHAVIOUR B. The Physiology of a Simple Reflex Act Fig. 2 is a diagram of the path of nervous energyin a reflex act—such as the withdrawal of thehand after touching something that is unpleasantly-hot. S is a sensory neurone, the axon ofwhich passes from the cell in the spinal cord tosome point on the surface of the hand. M. s Fig. 2.—Reflex Actio
Early adventures in Persia, Susiana, and Babylonia, including a residence among the Bakhtiyari and other wild tribes before the discovery of Nineveh . Fig. I.—Pyramidalcell from cerebrum.(From HalliburtonsHandbook of Physi-ology.) loo THE EDUCATION OF BEHAVIOUR B. The Physiology of a Simple Reflex Act Fig. 2 is a diagram of the path of nervous energyin a reflex act—such as the withdrawal of thehand after touching something that is unpleasantly-hot. S is a sensory neurone, the axon ofwhich passes from the cell in the spinal cord tosome point on the surface of the hand. M. s Fig. 2.—Reflex Action. (From Halliburton.) is the motor neurone, the axon of which passesfrom its cell in the spinal cord to one of themuscle fibres which control the movement ofthe hand, and I is what may be called anintermediary neurone. When the excessive heatstimulates the sensory neurone S, nervous energyis set free. This travels up the sensory neurone tothe intermediate neurone I, thence to the motorneurone M and thus down to the muscle fibre,which it causes to contract. In the diagram only FUNCTION OF NERVOUS SYSTEM loi one neurone of each kind has been shown, but inpractice many more are involved, for any move-ment of the hand depends oncontractions in a large number ofmuscle fibres and a stimulus likeheat usually affects more thanone sensory neurone. Further,we do not normally burn our-selves without being aware of it,and we do not become awareof stimuli unless some of thenervous energy which they setfree succeeds in reaching certainneurones in the brain. ThusFig, 2 only
Size: 1732px × 1443px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectirandescriptionandtravel, bookyear18
