REMOVAL OF THE BRAIN 



I0 5 



it almost resembles lace-work. Between its anterior attach- 

 ment to the crista galli of the ethmoid and its posterior 

 attachment to the tentorium cerebelli its lower margin is free 

 and concave, and it overhangs the corpus callosum, which 

 connects the two hemispheres together, but it is not in contact 

 with the corpus callosum except to a very slight extent 

 posteriorly. Along each border its two layers separate to 

 enclose a blood sinus. Along its upper convex margin runs 

 the superior sagittal sinus ; along its concave free . border 



Superior sagittal sinus 



Cerebellar fossa 



ssjg^c: 



Foramen magnum\ Transverse sinus 

 'erebellar fossa 



FIG. 34. Frontal section through the Cranial Cavity in a plane which passes 

 through the posterior part of the foramen magnum. The posterior 

 part of the cranial cavity, from which the brain has been removed, is 

 depicted. 



courses the much smaller inferior sagittal sinus ; whilst along 

 its attachment to the tentorium lies the straight sinus. 



Dissection. Removal of the Brain. 1 The dissectors should 

 now proceed to remove the brain. Divide the attachment of the 

 falx cerebri to the crista galli and pull the falx backwards. Next, 

 remove the block upon which the head rests, support the occiput 

 and posterior lobes of the brain with the left hand, and let the 

 head drop well downwards. In all probability, the frontal lobes of 

 the brain will fall away, by their own weight, from the anterior 

 fossa of the base of the cranium, and perhaps carry with them the 

 olfactory bulbs. Should they remain in position, however, 

 gently raise them with the fingers, and at the same time separate 

 the olfactory bulbs from the cribriform plate of the ethmoid with 



1 For alternative method see p. 115. 



