DISSECTION OF THE HEAD AND NECK 



199 



into the superior sagittal sinus and pull the hemisphere gently 

 lateralward. The falx cerebri may now be examined. 



Falx Cerebri. 



Examine its extent. How is it formed! To what is it at- 

 tached? Note that it contains three of the sinuses of the dura 

 mater (sinus durae matris), as follows: 



(a) Superior sagittal sinus (sinus sagittalis superior] (vide supra). 



(b) Inferior sagittal sinus (sinus sagittalis inferior) (0. T. inferior 



longitudinal sinus). 



(c) Straight sinus (sinus rectus). 



Venous space 



FIG. 84. 



Sinus sagittalis superior 



Dura mater 

 enceph. 



Falx cerebri 



Granulationes arachnoideales [Pacchioni] . 



Transverse section (magnified) passing through the falx cerebri, and showing the skull, menins-'< -. 

 and cortex cerebri. (From Poirier et Charpy, Traite" d'Anat. hum., Paris, 1899, t. iii., 1, p. 143, Fig. 98.) 



Removal of Brain. 



Cut through the attachment of the falx cerebri to the basis 

 cranii interna in front and pull it backward. Let the head hang 

 over the end of the table; support the occipital regions of the 

 brain in the left hand. The frontal lobes will fall away from the 

 floor of the skull ; if the bulbi olfactorii remain adherent, sepa- 

 rate them from the lamina cribrosa of the ethmoid bone with the 

 handle of a scalpel; this easily tears across the Nn. olfactorii, 

 which, coming through the lamina cribrosa from the nose, here 

 plunge into the olfactory bulb to terminate there. Next cut 



