. The home medical library. return of the trouble. It is only - _ [Text continued on page 39.] Plate IX REFLEX ACTION OF THE NERVOUS SYSTEM The upper illustration, on the opposite page, showsa hand held over a burning candle; the muscular ac-tion, which takes place when pain is felt, is indicatedby a dotted outline. When a person touches a flame, the impulse ofpain passes from Finger Tip to Spinal Cord throughthe Sensory Nerve. Another impulse is awakened inthe cord which, transmitted through the Motor Nervefrom Spinal Cord to the Muscles of the Arm andForearm, causes a sudden withdrawal of th
. The home medical library. return of the trouble. It is only - _ [Text continued on page 39.] Plate IX REFLEX ACTION OF THE NERVOUS SYSTEM The upper illustration, on the opposite page, showsa hand held over a burning candle; the muscular ac-tion, which takes place when pain is felt, is indicatedby a dotted outline. When a person touches a flame, the impulse ofpain passes from Finger Tip to Spinal Cord throughthe Sensory Nerve. Another impulse is awakened inthe cord which, transmitted through the Motor Nervefrom Spinal Cord to the Muscles of the Arm andForearm, causes a sudden withdrawal of the hand. The lower illustration shows a Section of theSpinal Cord and the anatomical connection between theMotor and Sensory Nerves. The Ventral Roots emerge from the front of thespinal cord and join the Dorsal Roots, which emergefrom the back of the cord. From this junction, nervefilaments are distributed to the arms, legs, and bothsides of the body; sensory fibers to the skin, and motorfibers to the muscles. 38 SPINAL/CORD. SENSORY nerve: BRINGING PAIN IMPULSEFROM FINGER TIP TOSPIN/VL CORD J^OTOR NERVE ;C LEADING REFLEX^IMPULSE FROM^SPINAL CORDTO FINGER TIP\ CROSS SECTIONOF SPINAL CORDAS AT «.
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