. A treatise on nervous and mental diseases, for students and practitioners of medicine. Photograph from Fraser, showing the cerebrum and the cerebellum in the cavity ofthe skull covered by the membranes; also the upper portion of the spinal cord. I. The longitudinal fissure corresponds with the median line ofthe vertex from the glabella, or junction of the nasal and frontalbones, to the inion, or occipital protuberance. II. To find tlie of Rolando: Measure the distance fromthe glabella to the inion, or occipital protuberance. Find 80 INTRODUCTORY. per cent, of this distance, and
. A treatise on nervous and mental diseases, for students and practitioners of medicine. Photograph from Fraser, showing the cerebrum and the cerebellum in the cavity ofthe skull covered by the membranes; also the upper portion of the spinal cord. I. The longitudinal fissure corresponds with the median line ofthe vertex from the glabella, or junction of the nasal and frontalbones, to the inion, or occipital protuberance. II. To find tlie of Rolando: Measure the distance fromthe glabella to the inion, or occipital protuberance. Find 80 INTRODUCTORY. per cent, of this distance, and this will indicate the upper end of thefissure of Rolando, which is generally from to centimetresTo find the course of this fissure, mark off from from the glabella. Fig. Photograph from Fraser, showing the cerebrum, the cerebellum, aud the upper portionof the spinal cord, the membranes having been removed. the upper end a line that shall form an angle ot 67 degrees an-teriorly with the longitudinal fissure. This will give the directionof the upper two-thirds of the fissure of Rolando, or about 2^inches, or centimetres. The lower third of this fissure, about ANATOMY. 81 centimetres in length, is somewhat more vertical, the total leugth ofthe whole fissure being centimetres. To find the lower end ofthe fissure of Rolando, mark off a line from the stephanion to theasterion, and another from the bregma to the external auditorymeatus, and the point of intersection of these two lines will be justover the lower end of the fissure about one centimetre above thefissure of Sylvius. The upper end of this fissure of Kolando variessomewhat in its position in adults of different races and sexes, butthe average variation is only about twenty millimetres,
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidtreatiseonnervou00gray
