More particularly, the headrest base 3 is of a construction wherein the base includes a centrally flat bottom plate 31 and side pieces 32, 32 extending upward in an inverted bell shape from {TAIL ~ either side} of the bottom plate 31 and wherein the end area 31 of the bottom plate 31 and {HEAD ~ the end area} 32 of the side pieces 32, 32 are gently curved rearwards in the manner that, when the patient rests his head on the headrest, the rear neck region of the patient can come into contact with the headrest 
More particularly , the headrest base 3 is of a construction wherein the base includes a centrally flat bottom plate 31 and side pieces 32 , 32 extending upward in an inverted bell shape from { TAIL ~ either side } of the bottom plate 31 and wherein the end area 31 of the bottom plate 31 and { HEAD ~ the end area } 32 of the side pieces 32 , 32 are gently curved rearwards in the manner that , when the patient rests his head on the headrest , the rear neck region of the patient can come into contact with the headrest
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