Operative surgery . D E C Fig. 285.—Chienes method oflocating the direction of thefissure of Rolando. 248 OPERATIVE SURGERY. The Parieto-occipital Fissure.—The portion of this fissure on the uppersurface of the cerehrum runs outward for about an inch at right angles withthe longitudinal fissure (Figs. 282 and 283). If the line indicating the loca-tion of the fissure of Sylvius be extended directly to the median line (, A) of the cranium, the last inch of the line (p. o. f.) lies above the upperportion of the parieto-occipital fissure. The external portion of the fissurevaries more in lo
Operative surgery . D E C Fig. 285.—Chienes method oflocating the direction of thefissure of Rolando. 248 OPERATIVE SURGERY. The Parieto-occipital Fissure.—The portion of this fissure on the uppersurface of the cerehrum runs outward for about an inch at right angles withthe longitudinal fissure (Figs. 282 and 283). If the line indicating the loca-tion of the fissure of Sylvius be extended directly to the median line (, A) of the cranium, the last inch of the line (p. o. f.) lies above the upperportion of the parieto-occipital fissure. The external portion of the fissurevaries more in location than any of the other important fissures. However,the whole or some portion of it is easily exposed through a properly locatedopening an inch in Fig. 286, A and B.—Reids Lines. A base line (Fig. A) is formed extending from the lower margin of the orbit to the cen-ter of the external auditory meatus, thence directly backward, U, Q. F, G, D, E aretwo perpendicular lines drawn from the longitudinal fissure to the base line, one pass-ing across the depression in front of the ear, the other along the posterior border ofthe mastoid process. F, H a line drawn from the upper end of the posterior perpen-dicular line to the point of junction of the anterior perpendicular one with the lineindicating the course of the fissure of Sylvius, and corresponding to the central orfissure of Rolando; e. a. p., external angular process. + The parietal eminence; a(Fig. B), convex line indicating lower boundary of the parietal lobe; 1. fr. c, first orsuperfrontal convolution; 1. fr. /., first frontal or superfrontal fissure separating thefirst from the second frontal convolution (2. fr. c.); 2. fr. /., second frontal fissureseparating second (2. fr
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