upper anal canal 6.5 ( 4-13 ) vs 8.3 ( 3.6-16 ) p less than 0.05 , thermal sensitivity , median threshold ( degrees c ) , lower anal canal 0.92 ( 0.5-2.5 ) vs 0.95 ( 0.3-3.6 ) ns ;
C0003461
anal
C0227411
anal canal