OCR Text |
Show Pins and Needles. After being for a long time In a constrained con-strained attitude a peculiar numbness nnd pricking is often felt In the arm, the leg or the foot. This Is caused by some interruption to the circulation of the blood and can usually be removed by rubbing or exercise. The reason for this sensation, which Is decidedly uncomfortable, is that pressure for a certain length of time deadens the sensibility sen-sibility of a nerve. When this pressure pres-sure is suddenly removed (as In straightening out the leg after sitting with it doubled underneath the body) sensibility gradually returns to the nerve and as each nerve fiber composing compos-ing the trunk regains Its normal condition condi-tion of sensibility a pricking sensation Is felt, and these successive prickings from the successive awakenings of the numerous fibers have not inaptly been called "pins and needles." |