Human anatomy, including structure and development and practical considerations . line fromthe most external point of the external angular process, at the level of the superiorborder of the orbit to the junction of the middle and Ujwer thirds of the frontal line,and prolontjed for about cm. (13/2 in.) behind the frontal line. The uj)per ex-tremity of the central fissure was found by them to lie between the niid-saj^ittal jjointand a point 18 mm. (3;^ in. ) behind it, and the lower extremity of this fissure theylocated near the squamosal line, about 18 mm. (3/^ in. ) in front of its junctio
Human anatomy, including structure and development and practical considerations . line fromthe most external point of the external angular process, at the level of the superiorborder of the orbit to the junction of the middle and Ujwer thirds of the frontal line,and prolontjed for about cm. (13/2 in.) behind the frontal line. The uj)per ex-tremity of the central fissure was found by them to lie between the niid-saj^ittal jjointand a point 18 mm. (3;^ in. ) behind it, and the lower extremity of this fissure theylocated near the squamosal line, about 18 mm. (3/^ in. ) in front of its junction withthe frontal line. The commencement of the lateral portion of the Syhian fissure isnot at a definite fixetl point, but will usually be hit at a point from cm. ( i y2-2in. ) behind the angular process, the course of the horizontal portion of thisfissure corresponding closely to the squamosal line (Mills). Fissure of Fig. 1044. Bregma Line for Rolaiidic fissure f Interparietal fissurt External parieto-occipital fissurt Parietal eminence Inioii Lateral sinus. Posterior limbSylvian fissure Line for Ivian fissure Vertical limV) of Sjlviau fissure Horizontal limbof Sylvian fissureGlabella Xasion Semidiagrammatic view of head, showing relation of Rolaiidic and Sylvian fissures and lines. The fissure of Sylvius begins anteriorly, approximately, at a point 3 cm. (i ^in.) behind the external angular process of the frontal bone ; and ends posteriorly ata point 18 mm. (3/^ in.) below the parietal eminence. A straight line between thesetwo points will represent the fissure, which is about 10 cm. (4 in.) long. The an-terior 18 mm. (3/^ in.) of this line will correspond to the main portion of the fissureand the remainder to the horizontal limb. The vertical limb ascends for cm. ?( I in.) from the posterior end of the main fissure. Around the posteriorend of the horizontal limb, and approximately under the parietal eminence lies thesupramarginal convolution. It is
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
