THE MENINGES OF THE BRAIN. 



Lymphatics. There are no lymphatic vessels in the cere- 

 bellum, but the perivascular lymph spaces carry out the lymph 

 and pour it chiefly into the subarachnoid space. 



TABLE I. 

 EMBRYOLOGIC DIVISIONS OF THE BRAIN. 



In accordance with its development the brain or encephalon 

 is naturally divided into three embryologic divisions which com- 

 prise the derivatives of the anterior, the middle and' the poste- 

 rior brain- vessels (Fig. 14). 



Cerebral Hemispheres 

 Corpus Callosum 

 Fornix 



Anterior Commissure 

 Septum Pellucidum 

 Lamina Terminalis 

 Tuber Cinereum 

 Optic Chiasma (grows 



into it) 



Lateral Ventricles 

 Foramina interventric- 



ularia 

 Aula of third Ventricle. 



Cerebrum < 



I. Fore -Brain, or 

 Prosencephalon -, 

 (Ant. vesicle) 



i. End-brain, or 

 Telencephalon 



2. Inter -brain, or 

 Diencephalon 



II. Mid-Brain, or 

 Mesencephalon 

 (Middle vesicle) 



Pedunculi 

 Cerebri 



2. Lamina 



Quadrigemina 



Thalami 



Corpora Mammillaria 

 Corpus Pineale 

 Corpora Geniculata 

 Third Ventricle, ex- 

 cepting the aula. 



Bases Pedunculi 

 Substantia Nigra 

 Tegmenta 



Cerebral Aqueduct (of 

 Sylvius) 



f Corpora Quadrigem- 

 { ina. 

 1 Brachia. 



