Atlas and text-book of topographic and applied anatomy . Sinus occipitalis Bulbus olfactorius M. temporalisTractus olfactorius A. cerebri post. A. cerebri cerebelli parietale-Pons A. cerebelli inf. basilarisA. vertebralis A. cerebelli inf. spinalis ant. M. occipitalis CRANIOCEREBRAL TOPOGRAPHY. 37 cerebral surface (in cases of cerebral abscess, tumors, and operations upon the cortex), the surgeonneeds certain lines as aids in the localization. In consequence of the manifold variations in theshape of the skull, these lines are no
Atlas and text-book of topographic and applied anatomy . Sinus occipitalis Bulbus olfactorius M. temporalisTractus olfactorius A. cerebri post. A. cerebri cerebelli parietale-Pons A. cerebelli inf. basilarisA. vertebralis A. cerebelli inf. spinalis ant. M. occipitalis CRANIOCEREBRAL TOPOGRAPHY. 37 cerebral surface (in cases of cerebral abscess, tumors, and operations upon the cortex), the surgeonneeds certain lines as aids in the localization. In consequence of the manifold variations in theshape of the skull, these lines are not absolutely accurate in all cases, but they nevertheless furnishindispensable guides. An exact topographic localization is never possible until the surgeon hasmade an extensive opening in the skull and exposed the cerebral surface. Kronlein recommendsthe following lines (see Fig. 13):. Fig. 13.—Craniocerebral topography (after Kronlein and Froriep). Explanation in the text. i. The base-line (horizontal line, ear-orbit line) through the infraorbital margin and theupper border of the external auditory meatus (Reids base-lino. 2. The superior horizontal line through the supraorbital margin, parallel to the base-line(line of Kronlein). 3. The anterior vertical line, at right angles to the base-line at the middle of the zygoma. 38 TOPOGRAPHIC AND APPLIED ANATOMY. 4. The middle vertical line, at right angles to the base-line from the condyloid process of themandible. 5. The posterior vertical line at right angles to the base-line from the most posterior portionof the base of the mastoid process. If the point of intersection of the anterior vertical with the superior horizontal line is connectedwith the point where the posterior vertical line strikes the vertex [that is, the antero-posteriormedian line of the vertex.—Ed.], we have: 6. The linca Rolandi, corresponding t
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