322 LABORATORY MANUAL OF HUMAN ANATOMY 



so called on account of the frequency of its involvement, as com- 

 pared with the other cerebral arteries, is one of the lenticular 

 branches of the A. cerebri media. For a full description of the 

 cerebral arteries and their relation to cerebral hemorrhages, see 

 v. Monakow, Gehirnpathologie, pp. 667-792. 



Veins (Venae cerebri). 

 Superficial. 



(a) Superior cerebral veins (Vv. cerebri superiores). 



(b) Middle cerebral vein (V. cerebri media}. 



(c) Inferior cerebral veins (Vv. cerebri inferiores). 



(d) Superior cerebellar veins (Vv. cerebelli superiores). 



(e) Inferior cerebellar veins (Vv. cerebelli inferiores). 



(f) Basal vein (V. basalis [Bosenthali]) . 

 Deep. These may be studied later. 



Removal of Meninges and Superficial Blood-vessels. 



Place the brain on the table, with the base upward. With 

 forceps and scissors, cautiously remove the membranes and 

 blood-vessels from the surface. The pia over the medulla oblon- 

 gata and lower part of pons may be left until after the cerebral 

 nerves have been identified and studied. The base of the brain 

 is now exposed, including a part of the basis cerebri and the 

 inferior (anterior) surfaces of the pons, medulla oblongata, and 

 cerebellum. Observe 



(a) Longitudinal fissure of cerebrum (fissura longitudinalis cerebri}. 



(b) Lateral fissure of cerebrum (fissura cerebri lateralis [Sylvii]) (0. T. 



fissure of Sylvius). 



(c) Temporal pole (polus temporalis). 



(d) Optic chiasm (chiasma opticum) with optic nerves (Nn. optici) and 



optic tracts (tractus optici). 



(e) Hypophysis (hypophysis) (0. T. pituitary body). This may have 



been left in the sella turcica. 



(f) Infundibulum (infundibulum) ("funnel"). 



(g) Ash-like tuber (tuber cinereum). 



(h) Mammillary bodies (corpora mammillaria) . 



(i) Cerebral peduncles (pedunculi cerebri) (0. T. crura cerebri). 



(j) Interpeduncular fossa (fossa inter peduncularis [Tarini]). 



(ja) Anterior recess (recessus anterior). 



(jb) Posterior recess (recessus posterior). 



(fr) Posterior perforated substance (substantia perforata posterior). 

 (I) Pons (pons [Varolii]) ("bridge"). 

 (m) Medulla oblongata. 



Cerebral Nerves (Nn. cerebrales). (Figs. 139 and 143.) 



The " superficial origins" of the cerebral nerves i.e., their 

 regions of exit from or entrance into the brain may now be 

 examined. 



